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Annotation of src/usr.bin/make/make.1, Revision 1.136

1.136   ! cube        1: .\"    $NetBSD: make.1,v 1.135 2008/01/19 06:52:14 sjg Exp $
1.15      thorpej     2: .\"
1.16      christos    3: .\" Copyright (c) 1990, 1993
                      4: .\"    The Regents of the University of California.  All rights reserved.
1.1       cgd         5: .\"
                      6: .\" Redistribution and use in source and binary forms, with or without
                      7: .\" modification, are permitted provided that the following conditions
                      8: .\" are met:
                      9: .\" 1. Redistributions of source code must retain the above copyright
                     10: .\"    notice, this list of conditions and the following disclaimer.
                     11: .\" 2. Redistributions in binary form must reproduce the above copyright
                     12: .\"    notice, this list of conditions and the following disclaimer in the
                     13: .\"    documentation and/or other materials provided with the distribution.
1.84      agc        14: .\" 3. Neither the name of the University nor the names of its contributors
1.1       cgd        15: .\"    may be used to endorse or promote products derived from this software
                     16: .\"    without specific prior written permission.
                     17: .\"
                     18: .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     19: .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     20: .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     21: .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     22: .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     23: .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     24: .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     25: .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     26: .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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1.16      christos   30: .\"    from: @(#)make.1        8.4 (Berkeley) 3/19/94
1.1       cgd        31: .\"
1.136   ! cube       32: .Dd August 10, 2008
1.1       cgd        33: .Dt MAKE 1
                     34: .Os
                     35: .Sh NAME
                     36: .Nm make
                     37: .Nd maintain program dependencies
                     38: .Sh SYNOPSIS
1.74      wiz        39: .Nm
1.75      thorpej    40: .Op Fl BeikNnqrstWX
1.30      mycroft    41: .Bk -words
1.1       cgd        42: .Op Fl D Ar variable
1.30      mycroft    43: .Ek
                     44: .Bk -words
1.1       cgd        45: .Op Fl d Ar flags
1.30      mycroft    46: .Ek
                     47: .Bk -words
1.1       cgd        48: .Op Fl f Ar makefile
1.30      mycroft    49: .Ek
                     50: .Bk -words
1.1       cgd        51: .Op Fl I Ar directory
1.30      mycroft    52: .Ek
1.1       cgd        53: .Bk -words
1.104     wiz        54: .Op Fl J Ar private
1.30      mycroft    55: .Ek
                     56: .Bk -words
1.104     wiz        57: .Op Fl j Ar max_jobs
1.44      sommerfe   58: .Ek
                     59: .Bk -words
1.13      christos   60: .Op Fl m Ar directory
1.1       cgd        61: .Ek
1.30      mycroft    62: .Bk -words
1.44      sommerfe   63: .Op Fl T Ar file
                     64: .Ek
                     65: .Bk -words
1.16      christos   66: .Op Fl V Ar variable
1.30      mycroft    67: .Ek
1.1       cgd        68: .Op Ar variable=value
1.30      mycroft    69: .Bk -words
1.1       cgd        70: .Op Ar target ...
1.30      mycroft    71: .Ek
1.1       cgd        72: .Sh DESCRIPTION
1.25      lukem      73: .Nm
1.1       cgd        74: is a program designed to simplify the maintenance of other programs.
                     75: Its input is a list of specifications as to the files upon which programs
                     76: and other files depend.
1.128     dsl        77: If no
                     78: .Fl f Ar makefile
                     79: makefile option is given,
                     80: .Nm
                     81: will try to open
1.1       cgd        82: .Ql Pa makefile
1.128     dsl        83: then
1.1       cgd        84: .Ql Pa Makefile
1.128     dsl        85: in order to find the specifications.
1.1       cgd        86: If the file
                     87: .Ql Pa .depend
                     88: exists, it is read (see
1.66      wiz        89: .Xr mkdep 1 ) .
1.1       cgd        90: .Pp
                     91: This manual page is intended as a reference document only.
                     92: For a more thorough description of
1.25      lukem      93: .Nm
1.1       cgd        94: and makefiles, please refer to
                     95: .%T "Make \- A Tutorial" .
                     96: .Pp
1.128     dsl        97: .Nm
                     98: will prepend the contents of the
                     99: .Va MAKEFLAGS
                    100: environment variable to the command line arguments before parsing them.
                    101: .Pp
1.1       cgd       102: The options are as follows:
                    103: .Bl -tag -width Ds
1.16      christos  104: .It Fl B
1.10      christos  105: Try to be backwards compatible by executing a single shell per command and
                    106: by executing the commands to make the sources of a dependency line in sequence.
1.1       cgd       107: .It Fl D Ar variable
1.8       christos  108: Define
                    109: .Ar variable
1.1       cgd       110: to be 1, in the global context.
1.128     dsl       111: .It Fl d Ar [-]flags
1.1       cgd       112: Turn on debugging, and specify which portions of
1.25      lukem     113: .Nm
1.1       cgd       114: are to print debugging information.
1.128     dsl       115: Unless the flags are preceded by
                    116: .Ql -
                    117: they are added to the
                    118: .Va MAKEFLAGS
                    119: environment variable and will be processed by any child make processes.
1.1       cgd       120: .Ar Flags
                    121: is one or more of the following:
                    122: .Bl -tag -width Ds
                    123: .It Ar A
                    124: Print all possible debugging information;
                    125: equivalent to specifying all of the debugging flags.
                    126: .It Ar a
                    127: Print debugging information about archive searching and caching.
                    128: .It Ar c
                    129: Print debugging information about conditional evaluation.
                    130: .It Ar d
                    131: Print debugging information about directory searching and caching.
1.88      jmmv      132: .It Ar e
                    133: Print debugging information about failed commands and targets.
1.128     dsl       134: .It Ar F
                    135: Use the rest of
                    136: .Ql flags
                    137: as the name of the file to which the debug output is written.
                    138: If the filename ends
                    139: .Ql .%d
                    140: then the
                    141: .Ql %d
                    142: is replaced by the pid.
1.87      jmmv      143: .It Ar f
                    144: Print debugging information about loop evaluation.
1.1       cgd       145: .It Ar "g1"
                    146: Print the input graph before making anything.
                    147: .It Ar "g2"
                    148: Print the input graph after making everything, or before exiting
1.93      dsl       149: on error.
1.92      dsl       150: .It Ar "g3"
                    151: Print the input graph before exiting on error.
1.1       cgd       152: .It Ar j
                    153: Print debugging information about running multiple shells.
1.135     sjg       154: .It Ar l
                    155: Print commands in Makefiles regardless of whether or not they are prefixed by
                    156: .Ql @
                    157: or other "quiet" flags.
                    158: Also known as "loud" behavior.
1.1       cgd       159: .It Ar m
                    160: Print debugging information about making targets, including modification
                    161: dates.
1.111     jmc       162: .It Ar n
1.112     wiz       163: Don't delete the temporary command scripts created in
                    164: .Pa /tmp
                    165: when running commands.
1.114     wiz       166: These are created via
1.111     jmc       167: .Xr mkstemp 3
1.112     wiz       168: and have names of the form
                    169: .Pa /tmp/makeXXXXX .
1.123     wiz       170: .Em NOTE :
                    171: This can create many file in
                    172: .Pa /tmp
                    173: so use with care.
1.119     dsl       174: .It Ar p
                    175: Print debugging information about makefile parsing.
1.1       cgd       176: .It Ar s
                    177: Print debugging information about suffix-transformation rules.
                    178: .It Ar t
                    179: Print debugging information about target list maintenance.
                    180: .It Ar v
                    181: Print debugging information about variable assignment.
1.49      sjg       182: .It Ar x
1.57      wiz       183: Run shell commands with
                    184: .Fl x
                    185: so the actual commands are printed as they are executed.
1.1       cgd       186: .El
                    187: .It Fl e
1.68      perry     188: Specify that environment variables override macro assignments within
1.1       cgd       189: makefiles.
                    190: .It Fl f Ar makefile
                    191: Specify a makefile to read instead of the default
1.103     wiz       192: .Ql Pa makefile .
1.1       cgd       193: If
                    194: .Ar makefile
                    195: is
                    196: .Ql Fl ,
                    197: standard input is read.
1.103     wiz       198: Multiple makefiles may be specified, and are read in the order specified.
1.1       cgd       199: .It Fl I Ar directory
                    200: Specify a directory in which to search for makefiles and included makefiles.
1.13      christos  201: The system makefile directory (or directories, see the
                    202: .Fl m
                    203: option) is automatically included as part of this list.
1.1       cgd       204: .It Fl i
                    205: Ignore non-zero exit of shell commands in the makefile.
                    206: Equivalent to specifying
                    207: .Ql Fl
                    208: before each command line in the makefile.
1.44      sommerfe  209: .It Fl J Ar private
                    210: This option should
                    211: .Em not
                    212: be specified by the user.
                    213: .Pp
                    214: When the
                    215: .Ar j
                    216: option is in use in a recursive build, this option is passed by a make
                    217: to child makes to allow all the make processes in the build to
                    218: cooperate to avoid overloading the system.
1.1       cgd       219: .It Fl j Ar max_jobs
                    220: Specify the maximum number of jobs that
1.25      lukem     221: .Nm
1.67      grant     222: may have running at any one time.
                    223: Turns compatibility mode off, unless the
1.11      christos  224: .Ar B
                    225: flag is also specified.
1.1       cgd       226: .It Fl k
                    227: Continue processing after errors are encountered, but only on those targets
                    228: that do not depend on the target whose creation caused the error.
1.13      christos  229: .It Fl m Ar directory
                    230: Specify a directory in which to search for sys.mk and makefiles included
1.99      wiz       231: via the
                    232: .Ao Ar file Ac Ns -style
                    233: include statement.
1.98      chuck     234: The
                    235: .Fl m
                    236: option can be used multiple times to form a search path.
1.13      christos  237: This path will override the default system include path: /usr/share/mk.
                    238: Furthermore the system include path will be appended to the search path used
1.99      wiz       239: for
                    240: .Qo Ar file Qc Ns -style
                    241: include statements (see the
1.13      christos  242: .Fl I
                    243: option).
1.98      chuck     244: .Pp
                    245: If a file or directory name in the
                    246: .Fl m
1.99      wiz       247: argument (or the
                    248: .Ev MAKESYSPATH
                    249: environment variable) starts with the string
                    250: .Qq \&.../
                    251: then
                    252: .Nm
                    253: will search for the specified file or directory named in the remaining part
                    254: of the argument string.
                    255: The search starts with the current directory of
1.98      chuck     256: the Makefile and then works upward towards the root of the filesystem.
1.99      wiz       257: If the search is successful, then the resulting directory replaces the
                    258: .Qq \&.../
                    259: specification in the
1.98      chuck     260: .Fl m
1.99      wiz       261: argument.
                    262: If used, this feature allows
1.98      chuck     263: .Nm
                    264: to easily search in the current source tree for customized sys.mk files
1.99      wiz       265: (e.g., by using
                    266: .Qq \&.../mk/sys.mk
                    267: as an argument).
1.1       cgd       268: .It Fl n
1.45      sommerfe  269: Display the commands that would have been executed, but do not
                    270: actually execute them unless the target depends on the .MAKE special
1.64      wiz       271: source (see below).
1.45      sommerfe  272: .It Fl N
                    273: Display the commands which would have been executed, but do not
                    274: actually execute any of them; useful for debugging top-level makefiles
                    275: without descending into subdirectories.
1.1       cgd       276: .It Fl q
                    277: Do not execute any commands, but exit 0 if the specified targets are
                    278: up-to-date and 1, otherwise.
                    279: .It Fl r
                    280: Do not use the built-in rules specified in the system makefile.
                    281: .It Fl s
                    282: Do not echo any commands as they are executed.
                    283: Equivalent to specifying
                    284: .Ql Ic @
                    285: before each command line in the makefile.
1.44      sommerfe  286: .It Fl T Ar tracefile
                    287: When used with the
1.48      wiz       288: .Fl j
1.44      sommerfe  289: flag,
                    290: append a trace record to
                    291: .Ar tracefile
                    292: for each job started and completed.
1.1       cgd       293: .It Fl t
                    294: Rather than re-building a target as specified in the makefile, create it
                    295: or update its modification time to make it appear up-to-date.
1.16      christos  296: .It Fl V Ar variable
                    297: Print
1.74      wiz       298: .Nm Ns 's
1.16      christos  299: idea of the value of
                    300: .Ar variable ,
                    301: in the global context.
                    302: Do not build any targets.
                    303: Multiple instances of this option may be specified;
                    304: the variables will be printed one per line,
                    305: with a blank line for each null or undefined variable.
1.85      sjg       306: If
                    307: .Ar variable
                    308: contains a
                    309: .Ql \&$
                    310: then the value will be expanded before printing.
1.46      christos  311: .It Fl W
                    312: Treat any warnings during makefile parsing as errors.
1.75      thorpej   313: .It Fl X
                    314: Don't export variables passed on the command line to the environment
                    315: individually.
                    316: Variables passed on the command line are still exported
                    317: via the
                    318: .Va MAKEFLAGS
                    319: environment variable.
                    320: This option may be useful on systems which have a small limit on the
                    321: size of command arguments.
1.1       cgd       322: .It Ar variable=value
                    323: Set the value of the variable
                    324: .Ar variable
                    325: to
                    326: .Ar value .
1.75      thorpej   327: Normally, all values passed on the command line are also exported to
                    328: sub-makes in the environment.
                    329: The
                    330: .Fl X
                    331: flag disables this behavior.
1.101     wiz       332: Variable assignments should follow options for POSIX compatibility
1.100     ross      333: but no ordering is enforced.
1.1       cgd       334: .El
                    335: .Pp
1.6       cgd       336: There are seven different types of lines in a makefile: file dependency
1.1       cgd       337: specifications, shell commands, variable assignments, include statements,
1.6       cgd       338: conditional directives, for loops, and comments.
1.1       cgd       339: .Pp
                    340: In general, lines may be continued from one line to the next by ending
                    341: them with a backslash
                    342: .Pq Ql \e .
                    343: The trailing newline character and initial whitespace on the following
                    344: line are compressed into a single space.
                    345: .Sh FILE DEPENDENCY SPECIFICATIONS
                    346: Dependency lines consist of one or more targets, an operator, and zero
                    347: or more sources.
                    348: This creates a relationship where the targets ``depend'' on the sources
                    349: and are usually created from them.
                    350: The exact relationship between the target and the source is determined
                    351: by the operator that separates them.
                    352: The three operators are as follows:
                    353: .Bl -tag -width flag
                    354: .It Ic \&:
                    355: A target is considered out-of-date if its modification time is less than
                    356: those of any of its sources.
                    357: Sources for a target accumulate over dependency lines when this operator
                    358: is used.
                    359: The target is removed if
1.25      lukem     360: .Nm
1.1       cgd       361: is interrupted.
                    362: .It Ic \&!
                    363: Targets are always re-created, but not until all sources have been
                    364: examined and re-created as necessary.
                    365: Sources for a target accumulate over dependency lines when this operator
                    366: is used.
                    367: The target is removed if
1.25      lukem     368: .Nm
1.1       cgd       369: is interrupted.
                    370: .It Ic \&::
                    371: If no sources are specified, the target is always re-created.
                    372: Otherwise, a target is considered out-of-date if any of its sources has
                    373: been modified more recently than the target.
                    374: Sources for a target do not accumulate over dependency lines when this
                    375: operator is used.
                    376: The target will not be removed if
1.25      lukem     377: .Nm
1.1       cgd       378: is interrupted.
                    379: .El
                    380: .Pp
                    381: Targets and sources may contain the shell wildcard values
1.80      wiz       382: .Ql \&? ,
1.1       cgd       383: .Ql * ,
1.103     wiz       384: .Ql [] ,
1.1       cgd       385: and
                    386: .Ql {} .
                    387: The values
1.80      wiz       388: .Ql \&? ,
1.103     wiz       389: .Ql * ,
1.1       cgd       390: and
                    391: .Ql []
                    392: may only be used as part of the final
                    393: component of the target or source, and must be used to describe existing
                    394: files.
                    395: The value
                    396: .Ql {}
                    397: need not necessarily be used to describe existing files.
                    398: Expansion is in directory order, not alphabetically as done in the shell.
                    399: .Sh SHELL COMMANDS
                    400: Each target may have associated with it a series of shell commands, normally
                    401: used to create the target.
                    402: Each of the commands in this script
                    403: .Em must
                    404: be preceded by a tab.
                    405: While any target may appear on a dependency line, only one of these
                    406: dependencies may be followed by a creation script, unless the
1.91      lukem     407: .Ql Ic \&::
1.1       cgd       408: operator is used.
                    409: .Pp
1.102     sjg       410: If the first characters of the command line are any combination of
                    411: .Ql Ic @ ,
1.103     wiz       412: .Ql Ic + ,
1.102     sjg       413: or
1.1       cgd       414: .Ql Ic \- ,
                    415: the command is treated specially.
                    416: A
                    417: .Ql Ic @
                    418: causes the command not to be echoed before it is executed.
                    419: A
1.102     sjg       420: .Ql Ic +
                    421: causes the command to be executed even when
                    422: .Fl n
                    423: is given.
                    424: This is similar to the effect of the .MAKE special source,
                    425: except that the effect can be limited to a single line of a script.
                    426: A
1.1       cgd       427: .Ql Ic \-
                    428: causes any non-zero exit status of the command line to be ignored.
                    429: .Sh VARIABLE ASSIGNMENTS
                    430: Variables in make are much like variables in the shell, and, by tradition,
                    431: consist of all upper-case letters.
1.91      lukem     432: .Ss Variable assignment modifiers
1.1       cgd       433: The five operators that can be used to assign values to variables are as
                    434: follows:
                    435: .Bl -tag -width Ds
                    436: .It Ic \&=
                    437: Assign the value to the variable.
                    438: Any previous value is overridden.
                    439: .It Ic \&+=
                    440: Append the value to the current value of the variable.
                    441: .It Ic \&?=
                    442: Assign the value to the variable if it is not already defined.
                    443: .It Ic \&:=
                    444: Assign with expansion, i.e. expand the value before assigning it
                    445: to the variable.
                    446: Normally, expansion is not done until the variable is referenced.
1.124     sjg       447: .Em NOTE :
                    448: References to undefined variables are
                    449: .Em not
1.125     wiz       450: expanded.
                    451: This can cause problems when variable modifiers are used.
1.1       cgd       452: .It Ic \&!=
                    453: Expand the value and pass it to the shell for execution and assign
                    454: the result to the variable.
                    455: Any newlines in the result are replaced with spaces.
                    456: .El
                    457: .Pp
                    458: Any white-space before the assigned
                    459: .Ar value
                    460: is removed; if the value is being appended, a single space is inserted
                    461: between the previous contents of the variable and the appended value.
                    462: .Pp
                    463: Variables are expanded by surrounding the variable name with either
                    464: curly braces
                    465: .Pq Ql {}
1.7       mycroft   466: or parentheses
1.1       cgd       467: .Pq Ql ()
                    468: and preceding it with
                    469: a dollar sign
                    470: .Pq Ql \&$ .
                    471: If the variable name contains only a single letter, the surrounding
1.7       mycroft   472: braces or parentheses are not required.
1.1       cgd       473: This shorter form is not recommended.
                    474: .Pp
                    475: Variable substitution occurs at two distinct times, depending on where
                    476: the variable is being used.
                    477: Variables in dependency lines are expanded as the line is read.
                    478: Variables in shell commands are expanded when the shell command is
                    479: executed.
1.91      lukem     480: .Ss Variable classes
1.1       cgd       481: The four different classes of variables (in order of increasing precedence)
                    482: are:
                    483: .Bl -tag -width Ds
                    484: .It Environment variables
                    485: Variables defined as part of
1.74      wiz       486: .Nm Ns 's
1.1       cgd       487: environment.
                    488: .It Global variables
                    489: Variables defined in the makefile or in included makefiles.
                    490: .It Command line variables
                    491: Variables defined as part of the command line.
                    492: .It Local variables
                    493: Variables that are defined specific to a certain target.
                    494: The seven local variables are as follows:
                    495: .Bl -tag -width ".ARCHIVE"
                    496: .It Va .ALLSRC
                    497: The list of all sources for this target; also known as
1.62      ross      498: .Ql Va \&\*[Gt] .
1.1       cgd       499: .It Va .ARCHIVE
                    500: The name of the archive file.
                    501: .It Va .IMPSRC
1.136   ! cube      502: In suffix-transformation rules, the name/path of the source from which the
        !           503: target is to be transformed (the ``implied'' source); also known as
1.62      ross      504: .Ql Va \&\*[Lt] .
1.136   ! cube      505: It is not defined in explicit rules.
1.1       cgd       506: .It Va .MEMBER
                    507: The name of the archive member.
                    508: .It Va .OODATE
                    509: The list of sources for this target that were deemed out-of-date; also
                    510: known as
                    511: .Ql Va \&? .
                    512: .It Va .PREFIX
                    513: The file prefix of the file, containing only the file portion, no suffix
                    514: or preceding directory components; also known as
                    515: .Ql Va * .
                    516: .It Va .TARGET
                    517: The name of the target; also known as
                    518: .Ql Va @ .
                    519: .El
                    520: .Pp
                    521: The shorter forms
                    522: .Ql Va @ ,
1.80      wiz       523: .Ql Va \&? ,
1.65      christos  524: .Ql Va \&\*[Lt] ,
                    525: .Ql Va \&\*[Gt] ,
1.1       cgd       526: and
                    527: .Ql Va *
                    528: are permitted for backward
                    529: compatibility with historical makefiles and are not recommended.
                    530: The six variables
                    531: .Ql Va "@F" ,
                    532: .Ql Va "@D" ,
1.62      ross      533: .Ql Va "\*[Lt]F" ,
                    534: .Ql Va "\*[Lt]D" ,
1.66      wiz       535: .Ql Va "*F" ,
1.1       cgd       536: and
                    537: .Ql Va "*D"
1.66      wiz       538: are permitted for compatibility with
1.1       cgd       539: .At V
                    540: makefiles and are not recommended.
                    541: .Pp
                    542: Four of the local variables may be used in sources on dependency lines
                    543: because they expand to the proper value for each target on the line.
                    544: These variables are
                    545: .Ql Va .TARGET ,
                    546: .Ql Va .PREFIX ,
                    547: .Ql Va .ARCHIVE ,
                    548: and
                    549: .Ql Va .MEMBER .
1.59      bgrayson  550: .El
1.91      lukem     551: .Ss Additional inbuilt variables
1.1       cgd       552: In addition,
1.25      lukem     553: .Nm
1.1       cgd       554: sets or knows about the following variables:
1.50      sjg       555: .Bl -tag -width .MAKEOVERRIDES
1.1       cgd       556: .It Va \&$
                    557: A single dollar sign
                    558: .Ql \&$ ,
                    559: i.e.
                    560: .Ql \&$$
                    561: expands to a single dollar
                    562: sign.
1.56      tv        563: .It Va .ALLTARGETS
1.67      grant     564: The list of all targets encountered in the Makefile.
                    565: If evaluated during
1.56      tv        566: Makefile parsing, lists only those targets encountered thus far.
1.1       cgd       567: .It Va .CURDIR
                    568: A path to the directory where
1.25      lukem     569: .Nm
1.1       cgd       570: was executed.
1.117     lukem     571: Refer to the description of
                    572: .Ql Ev PWD
                    573: for more details.
1.78      christos  574: .It Ev MAKE
1.55      tv        575: The name that
                    576: .Nm
1.89      sjg       577: was executed with
                    578: .Pq Va argv[0] .
1.126     reed      579: For compatibility
1.78      christos  580: .Nm
                    581: also sets
                    582: .Va .MAKE
                    583: with the same value.
1.97      lukem     584: The preferred variable to use is the environment variable
1.78      christos  585: .Ev MAKE
                    586: because it is more compatible with other versions of
                    587: .Nm
                    588: and cannot be confused with the special target with the same name.
1.134     sjg       589: .It Va .MAKE.EXPORTED
                    590: The list of variables exported by
                    591: .Nm .
                    592: .It Va .MAKE.MAKEFILES
                    593: The list of makefiles read by
                    594: .Nm ,
                    595: which is useful for tracking dependencies.
                    596: Each makefile is recorded only once, regardless of the number of times read.
1.132     sjg       597: .It Va .MAKE.PID
                    598: The process-id of
                    599: .Nm .
                    600: .It Va .MAKE.PPID
                    601: The parent process-id of
                    602: .Nm .
                    603: .It Va .MAKE.JOB.PREFIX
                    604: If
                    605: .Nm
                    606: is run with
                    607: .Ar j
                    608: then output for each target is prefixed with a token
                    609: .Ql --- target ---
                    610: the first part of which can be controlled via
                    611: .Va .MAKE.JOB.PREFIX .
                    612: .br
                    613: For example:
                    614: .Li .MAKE.JOB.PREFIX=${.newline}---${.MAKE:T}[${.MAKE.PID}]
                    615: would produce tokens like
                    616: .Ql ---make[1234] target ---
                    617: making it easier to track the degree of parallelism being achieved.
1.1       cgd       618: .It Ev MAKEFLAGS
                    619: The environment variable
                    620: .Ql Ev MAKEFLAGS
                    621: may contain anything that
                    622: may be specified on
1.74      wiz       623: .Nm Ns 's
1.1       cgd       624: command line.
                    625: Anything specified on
1.74      wiz       626: .Nm Ns 's
1.1       cgd       627: command line is appended to the
                    628: .Ql Ev MAKEFLAGS
                    629: variable which is then
                    630: entered into the environment for all programs which
1.25      lukem     631: .Nm
1.1       cgd       632: executes.
1.50      sjg       633: .It Va .MAKEOVERRIDES
1.57      wiz       634: This variable is used to record the names of variables assigned to
                    635: on the command line, so that they may be exported as part of
1.50      sjg       636: .Ql Ev MAKEFLAGS .
1.57      wiz       637: This behaviour can be disabled by assigning an empty value to
1.50      sjg       638: .Ql Va .MAKEOVERRIDES
1.67      grant     639: within a makefile.
                    640: Extra variables can be exported from a makefile
1.57      wiz       641: by appending their names to
1.51      sjg       642: .Ql Va .MAKEOVERRIDES .
                    643: .Ql Ev MAKEFLAGS
1.57      wiz       644: is re-exported whenever
1.51      sjg       645: .Ql Va .MAKEOVERRIDES
                    646: is modified.
1.55      tv        647: .It Va MAKE_PRINT_VAR_ON_ERROR
1.57      wiz       648: When
1.55      tv        649: .Nm
                    650: stops due to an error, it prints its name and the value of
                    651: .Ql Va .CURDIR
1.57      wiz       652: as well as the value of any variables named in
1.55      tv        653: .Ql Va MAKE_PRINT_VAR_ON_ERROR .
                    654: .It Va .newline
                    655: This variable is simply assigned a newline character as its value.
1.91      lukem     656: This allows expansions using the
                    657: .Cm \&:@
                    658: modifier to put a newline between
1.67      grant     659: iterations of the loop rather than a space.
                    660: For example, the printing of
1.55      tv        661: .Ql Va MAKE_PRINT_VAR_ON_ERROR
                    662: could be done as ${MAKE_PRINT_VAR_ON_ERROR:@v@$v='${$v}'${.newline}@}.
                    663: .It Va .OBJDIR
                    664: A path to the directory where the targets are built.
1.117     lukem     665: Its value is determined by trying to
                    666: .Xr chdir 2
                    667: to the following directories in order and using the first match:
                    668: .Bl -enum
                    669: .It
1.118     wiz       670: .Ev ${MAKEOBJDIRPREFIX}${.CURDIR}
                    671: .Pp
1.117     lukem     672: (Only if
                    673: .Ql Ev MAKEOBJDIRPREFIX
                    674: is set in the environment or on the command line.)
                    675: .It
1.118     wiz       676: .Ev ${MAKEOBJDIR}
                    677: .Pp
1.117     lukem     678: (Only if
                    679: .Ql Ev MAKEOBJDIR
                    680: is set in the environment or on the command line.)
                    681: .It
                    682: .Ev ${.CURDIR} Ns Pa /obj. Ns Ev ${MACHINE}
                    683: .It
                    684: .Ev ${.CURDIR} Ns Pa /obj
                    685: .It
                    686: .Pa /usr/obj/ Ns Ev ${.CURDIR}
                    687: .It
                    688: .Ev ${.CURDIR}
                    689: .El
                    690: .Pp
                    691: Variable expansion is performed on the value before it's used,
                    692: so expressions such as
                    693: .Dl ${.CURDIR:C,^/usr/src,/var/obj,}
                    694: may be used.
                    695: .Pp
                    696: .Ql Va .OBJDIR
                    697: may be modified in the makefile as a global variable.
                    698: In all cases,
                    699: .Nm
                    700: will
                    701: .Xr chdir 2
                    702: to
                    703: .Ql Va .OBJDIR
                    704: and set
                    705: .Ql Ev PWD
                    706: to that directory before executing any targets.
                    707: .
1.55      tv        708: .It Va .PARSEDIR
                    709: A path to the directory of the current
                    710: .Ql Pa Makefile
                    711: being parsed.
                    712: .It Va .PARSEFILE
                    713: The basename of the current
                    714: .Ql Pa Makefile
                    715: being parsed.
                    716: This variable and
                    717: .Ql Va .PARSEDIR
                    718: are both set only while the
                    719: .Ql Pa Makefiles
                    720: are being parsed.
1.69      sjg       721: .It Va .PATH
1.82      wiz       722: A variable that represents the list of directories that
1.69      sjg       723: .Nm
1.70      wiz       724: will search for files.
                    725: The search list should be updated using the target
1.69      sjg       726: .Ql Va .PATH
                    727: rather than the variable.
1.16      christos  728: .It Ev PWD
                    729: Alternate path to the current directory.
1.25      lukem     730: .Nm
1.16      christos  731: normally sets
                    732: .Ql Va .CURDIR
                    733: to the canonical path given by
1.48      wiz       734: .Xr getcwd 3 .
1.16      christos  735: However, if the environment variable
                    736: .Ql Ev PWD
                    737: is set and gives a path to the current directory, then
1.25      lukem     738: .Nm
1.16      christos  739: sets
                    740: .Ql Va .CURDIR
                    741: to the value of
                    742: .Ql Ev PWD
1.67      grant     743: instead.
                    744: This behaviour is disabled if
1.40      sjg       745: .Ql Ev MAKEOBJDIRPREFIX
1.117     lukem     746: is set or
                    747: .Ql Ev MAKEOBJDIR
                    748: contains a variable transform.
1.16      christos  749: .Ql Ev PWD
                    750: is set to the value of
                    751: .Ql Va .OBJDIR
                    752: for all programs which
1.25      lukem     753: .Nm
1.16      christos  754: executes.
1.1       cgd       755: .El
1.91      lukem     756: .Ss Variable modifiers
1.1       cgd       757: Variable expansion may be modified to select or modify each word of the
                    758: variable (where a ``word'' is white-space delimited sequence of characters).
                    759: The general format of a variable expansion is as follows:
                    760: .Pp
1.120     sjg       761: .Dl ${variable[:modifier[:...]]}
1.1       cgd       762: .Pp
1.97      lukem     763: Each modifier begins with a colon,
                    764: which may be escaped with a backslash
1.1       cgd       765: .Pq Ql \e .
1.120     sjg       766: .Pp
                    767: A set of modifiers can be specified via a variable, as follows:
                    768: .Pp
                    769: .Dl modifier_variable=modifier[:...]
                    770: .Dl ${variable:${modifier_variable}[:...]}
                    771: .Pp
                    772: In this case the first modifier in the modifier_variable does not
                    773: start with a colon, since that must appear in the referencing
                    774: variable.
                    775: If any of the modifiers in the modifier_variable contain a dollar sign
                    776: .Pq Ql $ ,
                    777: these must be doubled to avoid early expansion.
                    778: .Pp
1.97      lukem     779: The supported modifiers are:
1.61      ross      780: .Bl -tag -width EEE
1.91      lukem     781: .It Cm \&:E
1.1       cgd       782: Replaces each word in the variable with its suffix.
1.91      lukem     783: .It Cm \&:H
1.1       cgd       784: Replaces each word in the variable with everything but the last component.
1.91      lukem     785: .It Cm \&:M Ns Ar pattern
1.72      uebayasi  786: Select only those words that match
                    787: .Ar pattern .
1.1       cgd       788: The standard shell wildcard characters
                    789: .Pf ( Ql * ,
1.80      wiz       790: .Ql \&? ,
1.1       cgd       791: and
                    792: .Ql Op )
                    793: may
                    794: be used.
                    795: The wildcard characters may be escaped with a backslash
                    796: .Pq Ql \e .
1.91      lukem     797: .It Cm \&:N Ns Ar pattern
1.1       cgd       798: This is identical to
1.91      lukem     799: .Ql Cm \&:M ,
1.1       cgd       800: but selects all words which do not match
1.72      uebayasi  801: .Ar pattern .
1.91      lukem     802: .It Cm \&:O
1.109     wiz       803: Order every word in variable alphabetically.
                    804: To sort words in
                    805: reverse order use the
1.108     sjg       806: .Ql Cm \&:O:[-1..1]
                    807: combination of modifiers.
                    808: .It Cm \&:Ox
1.109     wiz       809: Randomize words in variable.
                    810: The results will be different each time you are referring to the
                    811: modified variable; use the assignment with expansion
1.108     sjg       812: .Pq Ql Cm \&:=
1.109     wiz       813: to prevent such behaviour.
                    814: For example,
1.108     sjg       815: .Bd -literal -offset indent
                    816: LIST=                  uno due tre quattro
                    817: RANDOM_LIST=           ${LIST:Ox}
                    818: STATIC_RANDOM_LIST:=   ${LIST:Ox}
                    819:
                    820: all:
                    821:        @echo "${RANDOM_LIST}"
                    822:        @echo "${RANDOM_LIST}"
                    823:        @echo "${STATIC_RANDOM_LIST}"
                    824:        @echo "${STATIC_RANDOM_LIST}"
                    825: .Ed
1.109     wiz       826: may produce output similar to:
1.108     sjg       827: .Bd -literal -offset indent
                    828: quattro due tre uno
                    829: tre due quattro uno
                    830: due uno quattro tre
                    831: due uno quattro tre
                    832: .Ed
1.91      lukem     833: .It Cm \&:Q
1.17      christos  834: Quotes every shell meta-character in the variable, so that it can be passed
                    835: safely through recursive invocations of
1.74      wiz       836: .Nm .
1.91      lukem     837: .It Cm \&:R
1.1       cgd       838: Replaces each word in the variable with everything but its suffix.
1.91      lukem     839: .It Cm \&:tl
1.60      pk        840: Converts variable to lower-case letters.
1.91      lukem     841: .It Cm \&:ts Ns Ar c
1.81      sjg       842: Words in the variable are normally separated by a space on expansion.
                    843: This modifier sets the separator to the character
                    844: .Ar c .
                    845: If
                    846: .Ar c
                    847: is omitted, then no separator is used.
1.91      lukem     848: .It Cm \&:tu
1.82      wiz       849: Converts variable to upper-case letters.
1.91      lukem     850: .It Cm \&:tW
1.89      sjg       851: Causes the value to be treated as a single word
                    852: (possibly containing embedded white space).
                    853: See also
1.91      lukem     854: .Ql Cm \&:[*] .
                    855: .It Cm \&:tw
1.89      sjg       856: Causes the value to be treated as a sequence of
                    857: words delimited by white space.
                    858: See also
1.91      lukem     859: .Ql Cm \&:[@] .
1.1       cgd       860: .Sm off
1.91      lukem     861: .It Cm \&:S No \&/ Ar old_string Xo
1.17      christos  862: .No \&/ Ar new_string
1.89      sjg       863: .No \&/ Op Cm 1gW
1.1       cgd       864: .Xc
                    865: .Sm on
                    866: Modify the first occurrence of
1.17      christos  867: .Ar old_string
                    868: in the variable's value, replacing it with
                    869: .Ar new_string .
1.1       cgd       870: If a
                    871: .Ql g
                    872: is appended to the last slash of the pattern, all occurrences
                    873: in each word are replaced.
1.17      christos  874: If a
                    875: .Ql 1
                    876: is appended to the last slash of the pattern, only the first word
                    877: is affected.
1.89      sjg       878: If a
                    879: .Ql W
                    880: is appended to the last slash of the pattern,
                    881: then the value is treated as a single word
                    882: (possibly containing embedded white space).
1.1       cgd       883: If
1.17      christos  884: .Ar old_string
                    885: begins with a caret
1.1       cgd       886: .Pq Ql ^ ,
1.17      christos  887: .Ar old_string
1.1       cgd       888: is anchored at the beginning of each word.
                    889: If
1.17      christos  890: .Ar old_string
1.1       cgd       891: ends with a dollar sign
                    892: .Pq Ql \&$ ,
                    893: it is anchored at the end of each word.
                    894: Inside
                    895: .Ar new_string ,
                    896: an ampersand
1.62      ross      897: .Pq Ql \*[Am]
1.1       cgd       898: is replaced by
1.17      christos  899: .Ar old_string
                    900: (without any
                    901: .Ql ^
                    902: or
                    903: .Ql \&$ ) .
1.1       cgd       904: Any character may be used as a delimiter for the parts of the modifier
                    905: string.
                    906: The anchoring, ampersand and delimiter characters may be escaped with a
                    907: backslash
                    908: .Pq Ql \e .
                    909: .Pp
                    910: Variable expansion occurs in the normal fashion inside both
                    911: .Ar old_string
                    912: and
                    913: .Ar new_string
                    914: with the single exception that a backslash is used to prevent the expansion
                    915: of a dollar sign
1.17      christos  916: .Pq Ql \&$ ,
1.1       cgd       917: not a preceding dollar sign as is usual.
1.17      christos  918: .Sm off
1.91      lukem     919: .It Cm \&:C No \&/ Ar pattern Xo
1.17      christos  920: .No \&/ Ar replacement
1.89      sjg       921: .No \&/ Op Cm 1gW
1.17      christos  922: .Xc
                    923: .Sm on
                    924: The
1.91      lukem     925: .Cm \&:C
1.17      christos  926: modifier is just like the
1.91      lukem     927: .Cm \&:S
1.37      msaitoh   928: modifier except that the old and new strings, instead of being
1.17      christos  929: simple strings, are a regular expression (see
                    930: .Xr regex 3 )
1.72      uebayasi  931: string
                    932: .Ar pattern
1.17      christos  933: and an
                    934: .Xr ed 1 Ns \-style
1.72      uebayasi  935: string
                    936: .Ar replacement .
                    937: Normally, the first occurrence of the pattern
                    938: .Ar pattern
                    939: in each word of the value is substituted with
                    940: .Ar replacement .
1.67      grant     941: The
1.17      christos  942: .Ql 1
                    943: modifier causes the substitution to apply to at most one word; the
                    944: .Ql g
                    945: modifier causes the substitution to apply to as many instances of the
1.72      uebayasi  946: search pattern
                    947: .Ar pattern
1.89      sjg       948: as occur in the word or words it is found in; the
                    949: .Ql W
                    950: modifier causes the value to be treated as a single word
                    951: (possibly containing embedded white space).
1.67      grant     952: Note that
1.17      christos  953: .Ql 1
                    954: and
                    955: .Ql g
                    956: are orthogonal; the former specifies whether multiple words are
                    957: potentially affected, the latter whether multiple substitutions can
                    958: potentially occur within each affected word.
1.91      lukem     959: .It Cm \&:T
1.1       cgd       960: Replaces each word in the variable with its last component.
1.91      lukem     961: .It Cm \&:u
1.43      christos  962: Remove adjacent duplicate words (like
1.57      wiz       963: .Xr uniq 1 ) .
1.91      lukem     964: .Sm off
                    965: .It Cm \&:\&? Ar true_string Cm \&: Ar false_string
                    966: .Sm on
1.105     sjg       967: If the variable (actually an expression; see below)
                    968: evaluates to true, return as its value the
1.57      wiz       969: .Ar true_string ,
1.27      christos  970: otherwise return the
1.57      wiz       971: .Ar false_string .
1.91      lukem     972: .It Ar :old_string=new_string
1.1       cgd       973: This is the
                    974: .At V
                    975: style variable substitution.
                    976: It must be the last modifier specified.
1.16      christos  977: If
1.6       cgd       978: .Ar old_string
                    979: or
                    980: .Ar new_string
                    981: do not contain the pattern matching character
                    982: .Ar %
1.16      christos  983: then it is assumed that they are
1.6       cgd       984: anchored at the end of each word, so only suffixes or entire
1.67      grant     985: words may be replaced.
                    986: Otherwise
1.6       cgd       987: .Ar %
1.16      christos  988: is the substring of
                    989: .Ar old_string
1.6       cgd       990: to be replaced in
1.64      wiz       991: .Ar new_string .
1.95      jmc       992: .Pp
                    993: Variable expansion occurs in the normal fashion inside both
                    994: .Ar old_string
                    995: and
                    996: .Ar new_string
1.96      wiz       997: with the single exception that a backslash is used to prevent the
                    998: expansion of a dollar sign
                    999: .Pq Ql \&$ ,
                   1000: not a preceding dollar sign as is usual.
1.91      lukem    1001: .Sm off
                   1002: .It Cm \&:@ Ar temp Cm @ Xo
1.80      wiz      1003: .Ar string Cm @
1.91      lukem    1004: .Sm on
1.40      sjg      1005: .Xc
                   1006: This is the loop expansion mechanism from the OSF Development
1.67      grant    1007: Environment (ODE) make.
                   1008: Unlike
1.48      wiz      1009: .Cm \&.for
1.40      sjg      1010: loops expansion occurs at the time of
1.67      grant    1011: reference.
                   1012: Assign
1.40      sjg      1013: .Ar temp
                   1014: to each word in the variable and evaluate
                   1015: .Ar string .
1.48      wiz      1016: The ODE convention is that
1.40      sjg      1017: .Ar temp
1.67      grant    1018: should start and end with a period.
                   1019: For example.
1.40      sjg      1020: .Dl ${LINKS:@.LINK.@${LN} ${TARGET} ${.LINK.}@}
1.91      lukem    1021: .It Cm \&:U Ns Ar newval
1.40      sjg      1022: If the variable is undefined
                   1023: .Ar newval
1.63      lukem    1024: is the value.
                   1025: If the variable is defined, the existing value is returned.
1.67      grant    1026: This is another ODE make feature.
                   1027: It is handy for setting per-target CFLAGS for instance:
1.40      sjg      1028: .Dl ${_${.TARGET:T}_CFLAGS:U${DEF_CFLAGS}}
1.63      lukem    1029: If a value is only required if the variable is undefined, use:
                   1030: .Dl ${VAR:D:Unewval}
1.91      lukem    1031: .It Cm \&:D Ns Ar newval
1.40      sjg      1032: If the variable is defined
                   1033: .Ar newval
                   1034: is the value.
1.91      lukem    1035: .It Cm \&:L
1.40      sjg      1036: The name of the variable is the value.
1.91      lukem    1037: .It Cm \&:P
1.40      sjg      1038: The path of the node which has the same name as the variable
1.67      grant    1039: is the value.
                   1040: If no such node exists or its path is null, then the
1.40      sjg      1041: name of the variable is used.
1.91      lukem    1042: .Sm off
                   1043: .It Cm \&:\&! Ar cmd Cm \&!
                   1044: .Sm on
1.40      sjg      1045: The output of running
                   1046: .Ar cmd
                   1047: is the value.
1.91      lukem    1048: .It Cm \&:sh
1.40      sjg      1049: If the variable is non-empty it is run as a command and the output
                   1050: becomes the new value.
1.91      lukem    1051: .It Cm \&::= Ns Ar str
1.48      wiz      1052: The variable is assigned the value
1.41      sjg      1053: .Ar str
1.67      grant    1054: after substitution.
                   1055: This modifier and its variations are useful in
1.48      wiz      1056: obscure situations such as wanting to apply modifiers to
1.41      sjg      1057: .Cm \&.for
1.48      wiz      1058: loop iteration variables which won't work due to the way
1.41      sjg      1059: .Cm \&.for
1.67      grant    1060: loops are implemented.
                   1061: These assignment modifiers always expand to
1.41      sjg      1062: nothing, so if appearing in a rule line by themselves should be
1.48      wiz      1063: preceded with something to keep
1.41      sjg      1064: .Nm
1.67      grant    1065: happy.
                   1066: As in:
1.41      sjg      1067: .Bd -literal
                   1068: use_foo: \&.USE
                   1069: \&.for i in ${\&.TARGET} ${\&.TARGET:R}\&.gz
1.42      sjg      1070:        @: ${t::=$i}
1.41      sjg      1071:        @echo t:R:T=${t:R:T}
                   1072: \&.endfor
                   1073:
                   1074: .Ed
1.91      lukem    1075: The
                   1076: .Ql Cm \&::
1.42      sjg      1077: helps avoid false matches with the
                   1078: .At V
1.48      wiz      1079: style
1.91      lukem    1080: .Cm \&:=
1.48      wiz      1081: modifier and since substitution always occurs the
1.91      lukem    1082: .Cm \&::=
1.42      sjg      1083: form is vaguely appropriate.
1.91      lukem    1084: .It Cm \&::?= Ns Ar str
1.41      sjg      1085: As for
1.91      lukem    1086: .Cm \&::=
1.41      sjg      1087: but only if the variable does not already have a value.
1.91      lukem    1088: .It Cm \&::+= Ns Ar str
1.48      wiz      1089: Append
1.41      sjg      1090: .Ar str
                   1091: to the variable.
1.91      lukem    1092: .It Cm \&::!= Ns Ar cmd
1.48      wiz      1093: Assign the output of
1.41      sjg      1094: .Ar cmd
                   1095: to the variable.
1.91      lukem    1096: .It Cm \&:\&[ Ns Ar range Ns Cm \&]
1.89      sjg      1097: Selects one or more words from the value,
                   1098: or performs other operations related to the way in which the
                   1099: value is divided into words.
                   1100: .Pp
                   1101: Ordinarily, a value is treated as a sequence of words
                   1102: delimited by white space.
                   1103: Some modifiers suppress this behaviour,
                   1104: causing a value to be treated as a single word
                   1105: (possibly containing embedded white space).
                   1106: An empty value, or a value that consists entirely of white-space,
                   1107: is treated as a single word.
                   1108: For the purposes of the
1.91      lukem    1109: .Ql Cm \&:[]
1.89      sjg      1110: modifier, the words are indexed both forwards using positive integers
                   1111: (where index 1 represents the first word),
                   1112: and backwards using negative integers
                   1113: (where index -1 represents the last word).
                   1114: .Pp
                   1115: The
                   1116: .Ar range
                   1117: is subjected to variable expansion, and the expanded result is
                   1118: then interpreted as follows:
                   1119: .Bl -tag -width index
1.90      jdolecek 1120: .\" :[n]
1.89      sjg      1121: .It Ar index
                   1122: Selects a single word from the value.
1.90      jdolecek 1123: .\" :[start..end]
1.89      sjg      1124: .It Ar start Ns Cm \&.. Ns Ar end
                   1125: Selects all words from
                   1126: .Ar start
                   1127: to
                   1128: .Ar end ,
                   1129: inclusive.
                   1130: For example,
1.91      lukem    1131: .Ql Cm \&:[2..-1]
1.89      sjg      1132: selects all words from the second word to the last word.
                   1133: If
                   1134: .Ar start
                   1135: is greater than
                   1136: .Ar end ,
1.91      lukem    1137: then the words are output in reverse order.
                   1138: For example,
                   1139: .Ql Cm \&:[-1..1]
1.89      sjg      1140: selects all the words from last to first.
1.90      jdolecek 1141: .\" :[*]
1.89      sjg      1142: .It Cm \&*
                   1143: Causes subsequent modifiers to treat the value as a single word
1.109     wiz      1144: (possibly containing embedded white space).
                   1145: Analogous to the effect of
1.94      wiz      1146: \&"$*\&"
1.89      sjg      1147: in Bourne shell.
1.90      jdolecek 1148: .\" :[0]
1.89      sjg      1149: .It 0
                   1150: Means the same as
1.91      lukem    1151: .Ql Cm \&:[*] .
1.90      jdolecek 1152: .\" :[*]
1.89      sjg      1153: .It Cm \&@
                   1154: Causes subsequent modifiers to treat the value as a sequence of words
1.109     wiz      1155: delimited by white space.
                   1156: Analogous to the effect of
1.94      wiz      1157: \&"$@\&"
1.89      sjg      1158: in Bourne shell.
1.90      jdolecek 1159: .\" :[#]
1.89      sjg      1160: .It Cm \&#
                   1161: Returns the number of words in the value.
                   1162: .El \" :[range]
1.6       cgd      1163: .El
                   1164: .Sh INCLUDE STATEMENTS, CONDITIONALS AND FOR LOOPS
1.16      christos 1165: Makefile inclusion, conditional structures and for loops  reminiscent
1.6       cgd      1166: of the C programming language are provided in
1.74      wiz      1167: .Nm .
1.1       cgd      1168: All such structures are identified by a line beginning with a single
                   1169: dot
                   1170: .Pq Ql \&.
                   1171: character.
                   1172: Files are included with either
1.29      ross     1173: .Cm \&.include Aq Ar file
1.1       cgd      1174: or
1.29      ross     1175: .Cm \&.include Pf \*q Ar file Ns \*q .
1.1       cgd      1176: Variables between the angle brackets or double quotes are expanded
                   1177: to form the file name.
                   1178: If angle brackets are used, the included makefile is expected to be in
                   1179: the system makefile directory.
                   1180: If double quotes are used, the including makefile's directory and any
                   1181: directories specified using the
                   1182: .Fl I
                   1183: option are searched before the system
                   1184: makefile directory.
1.28      christos 1185: For compatibility with other versions of
                   1186: .Nm
                   1187: .Ql include file ...
1.67      grant    1188: is also accepted.
                   1189: If the include statement is written as
1.29      ross     1190: .Cm .-include
                   1191: or as
                   1192: .Cm .sinclude
1.28      christos 1193: then errors locating and/or opening include files are ignored.
1.1       cgd      1194: .Pp
                   1195: Conditional expressions are also preceded by a single dot as the first
1.5       jtc      1196: character of a line.
1.1       cgd      1197: The possible conditionals are as follows:
                   1198: .Bl -tag -width Ds
1.133     sjg      1199: .It Ic .export Ar variable
                   1200: Export the specified global variable.
                   1201: If no variable is provided, all globals are exported
                   1202: except for internal variables (those that start with
                   1203: .Ql \&.
                   1204: ).
                   1205: This is not affected by the
                   1206: .Fl X
                   1207: flag, so should be used with caution.
                   1208: Appending a variable name to
                   1209: .Va .MAKE.EXPORTED
                   1210: is equivalent to exporting a variable.
1.1       cgd      1211: .It Ic .undef Ar variable
                   1212: Un-define the specified global variable.
                   1213: Only global variables may be un-defined.
                   1214: .It Xo
                   1215: .Ic \&.if
                   1216: .Oo \&! Oc Ns Ar expression
                   1217: .Op Ar operator expression ...
                   1218: .Xc
                   1219: Test the value of an expression.
                   1220: .It Xo
                   1221: .Ic .ifdef
                   1222: .Oo \&! Oc Ns Ar variable
                   1223: .Op Ar operator variable ...
                   1224: .Xc
1.7       mycroft  1225: Test the value of a variable.
1.1       cgd      1226: .It Xo
                   1227: .Ic .ifndef
                   1228: .Oo \&! Oc Ns Ar variable
                   1229: .Op Ar operator variable ...
                   1230: .Xc
1.7       mycroft  1231: Test the value of a variable.
1.1       cgd      1232: .It Xo
                   1233: .Ic .ifmake
                   1234: .Oo \&! Oc Ns Ar target
                   1235: .Op Ar operator target ...
                   1236: .Xc
1.7       mycroft  1237: Test the target being built.
1.1       cgd      1238: .It Xo
                   1239: .Ic .ifnmake
1.80      wiz      1240: .Oo \&! Ns Oc Ar target
1.1       cgd      1241: .Op Ar operator target ...
                   1242: .Xc
                   1243: Test the target being built.
                   1244: .It Ic .else
                   1245: Reverse the sense of the last conditional.
                   1246: .It Xo
                   1247: .Ic .elif
1.80      wiz      1248: .Oo \&! Ns Oc Ar expression
1.1       cgd      1249: .Op Ar operator expression ...
                   1250: .Xc
                   1251: A combination of
                   1252: .Ql Ic .else
                   1253: followed by
                   1254: .Ql Ic .if .
                   1255: .It Xo
                   1256: .Ic .elifdef
                   1257: .Oo \&! Oc Ns Ar variable
                   1258: .Op Ar operator variable ...
                   1259: .Xc
                   1260: A combination of
                   1261: .Ql Ic .else
                   1262: followed by
                   1263: .Ql Ic .ifdef .
                   1264: .It Xo
                   1265: .Ic .elifndef
                   1266: .Oo \&! Oc Ns Ar variable
                   1267: .Op Ar operator variable ...
                   1268: .Xc
                   1269: A combination of
                   1270: .Ql Ic .else
                   1271: followed by
                   1272: .Ql Ic .ifndef .
                   1273: .It Xo
                   1274: .Ic .elifmake
                   1275: .Oo \&! Oc Ns Ar target
                   1276: .Op Ar operator target ...
                   1277: .Xc
                   1278: A combination of
                   1279: .Ql Ic .else
                   1280: followed by
                   1281: .Ql Ic .ifmake .
                   1282: .It Xo
                   1283: .Ic .elifnmake
                   1284: .Oo \&! Oc Ns Ar target
                   1285: .Op Ar operator target ...
                   1286: .Xc
                   1287: A combination of
                   1288: .Ql Ic .else
                   1289: followed by
                   1290: .Ql Ic .ifnmake .
                   1291: .It Ic .endif
                   1292: End the body of the conditional.
                   1293: .El
                   1294: .Pp
                   1295: The
                   1296: .Ar operator
                   1297: may be any one of the following:
                   1298: .Bl -tag -width "Cm XX"
                   1299: .It Cm \&|\&|
1.64      wiz      1300: Logical OR.
1.62      ross     1301: .It Cm \&\*[Am]\*[Am]
1.1       cgd      1302: Logical
                   1303: .Tn AND ;
                   1304: of higher precedence than
1.26      hubertf  1305: .Dq \&|\&| .
1.1       cgd      1306: .El
                   1307: .Pp
                   1308: As in C,
1.25      lukem    1309: .Nm
1.1       cgd      1310: will only evaluate a conditional as far as is necessary to determine
                   1311: its value.
1.16      christos 1312: Parentheses may be used to change the order of evaluation.
1.1       cgd      1313: The boolean operator
                   1314: .Ql Ic \&!
                   1315: may be used to logically negate an entire
                   1316: conditional.
1.5       jtc      1317: It is of higher precedence than
1.62      ross     1318: .Ql Ic \&\*[Am]\*[Am] .
1.1       cgd      1319: .Pp
                   1320: The value of
                   1321: .Ar expression
                   1322: may be any of the following:
1.61      ross     1323: .Bl -tag -width defined
1.1       cgd      1324: .It Ic defined
                   1325: Takes a variable name as an argument and evaluates to true if the variable
                   1326: has been defined.
                   1327: .It Ic make
                   1328: Takes a target name as an argument and evaluates to true if the target
                   1329: was specified as part of
1.74      wiz      1330: .Nm Ns 's
1.1       cgd      1331: command line or was declared the default target (either implicitly or
                   1332: explicitly, see
                   1333: .Va .MAIN )
                   1334: before the line containing the conditional.
                   1335: .It Ic empty
1.5       jtc      1336: Takes a variable, with possible modifiers, and evaluates to true if
1.1       cgd      1337: the expansion of the variable would result in an empty string.
                   1338: .It Ic exists
                   1339: Takes a file name as an argument and evaluates to true if the file exists.
                   1340: The file is searched for on the system search path (see
                   1341: .Va .PATH ) .
                   1342: .It Ic target
                   1343: Takes a target name as an argument and evaluates to true if the target
                   1344: has been defined.
1.47      christos 1345: .It Ic commands
                   1346: Takes a target name as an argument and evaluates to true if the target
                   1347: has been defined and has commands associated with it.
1.1       cgd      1348: .El
                   1349: .Pp
                   1350: .Ar Expression
1.67      grant    1351: may also be an arithmetic or string comparison.
                   1352: Variable expansion is
1.6       cgd      1353: performed on both sides of the comparison, after which the integral
1.67      grant    1354: values are compared.
                   1355: A value is interpreted as hexadecimal if it is
1.6       cgd      1356: preceded by 0x, otherwise it is decimal; octal numbers are not supported.
1.67      grant    1357: The standard C relational operators are all supported.
                   1358: If after
1.6       cgd      1359: variable expansion, either the left or right hand side of a
1.1       cgd      1360: .Ql Ic ==
                   1361: or
                   1362: .Ql Ic "!="
1.6       cgd      1363: operator is not an integral value, then
                   1364: string comparison is performed between the expanded
                   1365: variables.
1.1       cgd      1366: If no relational operator is given, it is assumed that the expanded
1.102     sjg      1367: variable is being compared against 0 or an empty string in the case
                   1368: of a string comparison.
1.1       cgd      1369: .Pp
                   1370: When
1.25      lukem    1371: .Nm
1.1       cgd      1372: is evaluating one of these conditional expression, and it encounters
                   1373: a word it doesn't recognize, either the ``make'' or ``defined''
                   1374: expression is applied to it, depending on the form of the conditional.
                   1375: If the form is
                   1376: .Ql Ic .ifdef
                   1377: or
                   1378: .Ql Ic .ifndef ,
                   1379: the ``defined'' expression
                   1380: is applied.
                   1381: Similarly, if the form is
                   1382: .Ql Ic .ifmake
                   1383: or
                   1384: .Ql Ic .ifnmake , the ``make''
                   1385: expression is applied.
                   1386: .Pp
                   1387: If the conditional evaluates to true the parsing of the makefile continues
                   1388: as before.
                   1389: If it evaluates to false, the following lines are skipped.
                   1390: In both cases this continues until a
                   1391: .Ql Ic .else
                   1392: or
                   1393: .Ql Ic .endif
                   1394: is found.
1.16      christos 1395: .Pp
1.6       cgd      1396: For loops are typically used to apply a set of rules to a list of files.
                   1397: The syntax of a for loop is:
1.59      bgrayson 1398: .Pp
                   1399: .Bl -tag -compact -width Ds
1.6       cgd      1400: .It Xo
                   1401: .Ic \&.for
1.48      wiz      1402: .Ar variable
1.39      christos 1403: .Op Ar variable ...
1.16      christos 1404: .Ic in
1.6       cgd      1405: .Ar expression
                   1406: .Xc
1.80      wiz      1407: .It Aq make-rules
                   1408: .It Ic \&.endfor
1.6       cgd      1409: .El
1.59      bgrayson 1410: .Pp
1.6       cgd      1411: After the for
1.16      christos 1412: .Ic expression
1.67      grant    1413: is evaluated, it is split into words.
                   1414: On each iteration of the loop, one word is taken and assigned to each
1.39      christos 1415: .Ic variable ,
                   1416: in order, and these
                   1417: .Ic variables
                   1418: are substituted into the
1.16      christos 1419: .Ic make-rules
1.6       cgd      1420: inside the body of the for loop.
1.39      christos 1421: The number of words must come out even; that is, if there are three
                   1422: iteration variables, the number of words provided must be a multiple
                   1423: of three.
1.1       cgd      1424: .Sh COMMENTS
                   1425: Comments begin with a hash
                   1426: .Pq Ql \&#
                   1427: character, anywhere but in a shell
1.114     wiz      1428: command line, and continue to the end of an unescaped new line.
1.97      lukem    1429: .Sh SPECIAL SOURCES (ATTRIBUTES)
1.61      ross     1430: .Bl -tag -width .IGNOREx
1.97      lukem    1431: .It Ic .EXEC
                   1432: Target is never out of date, but always execute commands anyway.
1.1       cgd      1433: .It Ic .IGNORE
                   1434: Ignore any errors from the commands associated with this target, exactly
                   1435: as if they all were preceded by a dash
                   1436: .Pq Ql \- .
1.97      lukem    1437: .\" .It Ic .INVISIBLE
                   1438: .\" XXX
                   1439: .\" .It Ic .JOIN
                   1440: .\" XXX
1.18      christos 1441: .It Ic .MADE
1.48      wiz      1442: Mark all sources of this target as being up-to-date.
1.1       cgd      1443: .It Ic .MAKE
                   1444: Execute the commands associated with this target even if the
                   1445: .Fl n
                   1446: or
                   1447: .Fl t
                   1448: options were specified.
                   1449: Normally used to mark recursive
1.74      wiz      1450: .Nm Ns 's .
1.97      lukem    1451: .It Ic .NOPATH
                   1452: Do not search for the target in the directories specified by
                   1453: .Ic .PATH .
1.1       cgd      1454: .It Ic .NOTMAIN
                   1455: Normally
1.25      lukem    1456: .Nm
1.1       cgd      1457: selects the first target it encounters as the default target to be built
                   1458: if no target was specified.
                   1459: This source prevents this target from being selected.
                   1460: .It Ic .OPTIONAL
                   1461: If a target is marked with this attribute and
1.25      lukem    1462: .Nm
1.1       cgd      1463: can't figure out how to create it, it will ignore this fact and assume
                   1464: the file isn't needed or already exists.
1.97      lukem    1465: .It Ic .PHONY
                   1466: The target does not
                   1467: correspond to an actual file; it is always considered to be out of date,
                   1468: and will not be created with the
                   1469: .Fl t
                   1470: option.
1.1       cgd      1471: .It Ic .PRECIOUS
                   1472: When
1.25      lukem    1473: .Nm
1.131     rillig   1474: is interrupted, it normally removes any partially made targets.
1.1       cgd      1475: This source prevents the target from being removed.
1.97      lukem    1476: .It Ic .RECURSIVE
                   1477: Synonym for
                   1478: .Ic .MAKE .
1.1       cgd      1479: .It Ic .SILENT
                   1480: Do not echo any of the commands associated with this target, exactly
                   1481: as if they all were preceded by an at sign
                   1482: .Pq Ql @ .
                   1483: .It Ic .USE
                   1484: Turn the target into
1.74      wiz      1485: .Nm Ns 's
1.1       cgd      1486: version of a macro.
                   1487: When the target is used as a source for another target, the other target
                   1488: acquires the commands, sources, and attributes (except for
                   1489: .Ic .USE )
                   1490: of the
                   1491: source.
                   1492: If the target already has commands, the
                   1493: .Ic .USE
                   1494: target's commands are appended
                   1495: to them.
1.52      christos 1496: .It Ic .USEBEFORE
                   1497: Exactly like
                   1498: .Ic .USE ,
1.57      wiz      1499: but prepend the
1.52      christos 1500: .Ic .USEBEFORE
                   1501: target commands to the target.
1.12      christos 1502: .It Ic .WAIT
1.71      mjl      1503: If
1.12      christos 1504: .Ic .WAIT
1.71      mjl      1505: appears in a dependency line, the sources that precede it are
1.67      grant    1506: made before the sources that succeed it in the line.
1.128     dsl      1507: Since the dependents of files are not made until the file itself
                   1508: could be made, this also stops the dependents being built unless they
                   1509: are needed for another branch of the dependency tree.
                   1510: So given:
                   1511: .Bd -literal
                   1512: x: a .WAIT b
                   1513:        echo x
                   1514: a:
                   1515:        echo a
                   1516: b: b1
                   1517:        echo b
                   1518: b1:
                   1519:        echo b1
                   1520:
                   1521: .Ed
                   1522: the output is always
                   1523: .Ql b1 ,
                   1524: .Ql b ,
                   1525: .Ql a ,
                   1526: .Ql x .
                   1527: .br
1.122     apb      1528: The ordering imposed by
                   1529: .Ic .WAIT
1.128     dsl      1530: is only relevant for parallel makes.
1.1       cgd      1531: .El
1.57      wiz      1532: .Sh SPECIAL TARGETS
1.1       cgd      1533: Special targets may not be included with other targets, i.e. they must be
                   1534: the only target specified.
1.61      ross     1535: .Bl -tag -width .BEGINx
1.1       cgd      1536: .It Ic .BEGIN
                   1537: Any command lines attached to this target are executed before anything
                   1538: else is done.
                   1539: .It Ic .DEFAULT
                   1540: This is sort of a
                   1541: .Ic .USE
                   1542: rule for any target (that was used only as a
                   1543: source) that
1.25      lukem    1544: .Nm
1.1       cgd      1545: can't figure out any other way to create.
                   1546: Only the shell script is used.
                   1547: The
                   1548: .Ic .IMPSRC
                   1549: variable of a target that inherits
                   1550: .Ic .DEFAULT Ns 's
                   1551: commands is set
                   1552: to the target's own name.
                   1553: .It Ic .END
                   1554: Any command lines attached to this target are executed after everything
                   1555: else is done.
                   1556: .It Ic .IGNORE
                   1557: Mark each of the sources with the
                   1558: .Ic .IGNORE
                   1559: attribute.
                   1560: If no sources are specified, this is the equivalent of specifying the
                   1561: .Fl i
                   1562: option.
                   1563: .It Ic .INTERRUPT
                   1564: If
1.25      lukem    1565: .Nm
1.1       cgd      1566: is interrupted, the commands for this target will be executed.
                   1567: .It Ic .MAIN
                   1568: If no target is specified when
1.25      lukem    1569: .Nm
1.1       cgd      1570: is invoked, this target will be built.
                   1571: .It Ic .MAKEFLAGS
                   1572: This target provides a way to specify flags for
1.25      lukem    1573: .Nm
1.1       cgd      1574: when the makefile is used.
                   1575: The flags are as if typed to the shell, though the
                   1576: .Fl f
                   1577: option will have
                   1578: no effect.
1.12      christos 1579: .\" XXX: NOT YET!!!!
                   1580: .\" .It Ic .NOTPARALLEL
1.70      wiz      1581: .\" The named targets are executed in non parallel mode.
                   1582: .\" If no targets are
1.12      christos 1583: .\" specified, then all targets are executed in non parallel mode.
1.20      gwr      1584: .It Ic .NOPATH
                   1585: Apply the
                   1586: .Ic .NOPATH
1.67      grant    1587: attribute to any specified sources.
1.12      christos 1588: .It Ic .NOTPARALLEL
                   1589: Disable parallel mode.
                   1590: .It Ic .NO_PARALLEL
1.97      lukem    1591: Synonym for
                   1592: .Ic .NOTPARALLEL ,
                   1593: for compatibility with other pmake variants.
1.12      christos 1594: .It Ic .ORDER
                   1595: The named targets are made in sequence.
1.128     dsl      1596: This ordering does not add targets to the list of targets to be made.
                   1597: Since the dependents of a target do not get built until the target itself
                   1598: could be built, unless
                   1599: .Ql a
1.129     wiz      1600: is built by another part of the dependency graph,
1.128     dsl      1601: the following is a dependency loop:
                   1602: .Bd -literal
                   1603: \&.ORDER a b
                   1604: b: a
                   1605: .Ed
1.129     wiz      1606: .Pp
1.122     apb      1607: The ordering imposed by
                   1608: .Ic .ORDER
1.128     dsl      1609: is only relevant for parallel makes.
1.12      christos 1610: .\" XXX: NOT YET!!!!
                   1611: .\" .It Ic .PARALLEL
1.70      wiz      1612: .\" The named targets are executed in parallel mode.
                   1613: .\" If no targets are
1.12      christos 1614: .\" specified, then all targets are executed in parallel mode.
1.1       cgd      1615: .It Ic .PATH
                   1616: The sources are directories which are to be searched for files not
                   1617: found in the current directory.
                   1618: If no sources are specified, any previously specified directories are
                   1619: deleted.
1.34      thorpej  1620: If the source is the special
                   1621: .Ic .DOTLAST
                   1622: target, then the current working
1.33      thorpej  1623: directory is searched last.
1.14      christos 1624: .It Ic .PHONY
                   1625: Apply the
                   1626: .Ic .PHONY
1.67      grant    1627: attribute to any specified sources.
1.1       cgd      1628: .It Ic .PRECIOUS
                   1629: Apply the
                   1630: .Ic .PRECIOUS
                   1631: attribute to any specified sources.
                   1632: If no sources are specified, the
                   1633: .Ic .PRECIOUS
                   1634: attribute is applied to every
                   1635: target in the file.
1.83      sjg      1636: .It Ic .SHELL
1.86      wiz      1637: Sets the shell that
1.83      sjg      1638: .Nm
1.86      wiz      1639: will use to execute commands.
                   1640: The sources are a set of
1.83      sjg      1641: .Ar field=value
1.86      wiz      1642: pairs.
1.83      sjg      1643: .Bl -tag -width hasErrCtls
                   1644: .It Ar name
                   1645: This is the minimal specification, used to select one of the builtin
                   1646: shell specs;
                   1647: .Ar sh ,
                   1648: .Ar ksh ,
                   1649: and
                   1650: .Ar csh .
                   1651: .It Ar path
                   1652: Specifies the path to the shell.
                   1653: .It Ar hasErrCtl
                   1654: Indicates whether the shell supports exit on error.
                   1655: .It Ar check
                   1656: The command to turn on error checking.
                   1657: .It Ar ignore
                   1658: The command to disable error checking.
                   1659: .It Ar echo
                   1660: The command to turn on echoing of commands executed.
                   1661: .It Ar quiet
                   1662: The command to turn off echoing of commands executed.
                   1663: .It Ar filter
                   1664: The output to filter after issuing the
                   1665: .Ar quiet
1.86      wiz      1666: command.
                   1667: It is typically identical to
1.83      sjg      1668: .Ar quiet .
                   1669: .It Ar errFlag
                   1670: The flag to pass the shell to enable error checking.
                   1671: .It Ar echoFlag
                   1672: The flag to pass the shell to enable command echoing.
1.127     rillig   1673: .It Ar newline
                   1674: The string literal to pass the shell that results in a single newline
                   1675: character when used outside of any quoting characters.
1.83      sjg      1676: .El
                   1677: Example:
                   1678: .Bd -literal
                   1679: \&.SHELL: name=ksh path=/bin/ksh hasErrCtl=true \\
                   1680:        check="set -e" ignore="set +e" \\
                   1681:        echo="set -v" quiet="set +v" filter="set +v" \\
1.127     rillig   1682:        echoFlag=v errFlag=e newline="'\\n'"
1.83      sjg      1683: .Ed
1.1       cgd      1684: .It Ic .SILENT
                   1685: Apply the
                   1686: .Ic .SILENT
                   1687: attribute to any specified sources.
                   1688: If no sources are specified, the
                   1689: .Ic .SILENT
                   1690: attribute is applied to every
                   1691: command in the file.
                   1692: .It Ic .SUFFIXES
                   1693: Each source specifies a suffix to
1.74      wiz      1694: .Nm .
1.71      mjl      1695: If no sources are specified, any previously specified suffixes are deleted.
1.136   ! cube     1696: It allows the creation of suffix-transformation rules.
        !          1697: .Pp
        !          1698: Example:
        !          1699: .Bd -literal
        !          1700: \&.SUFFIXES: .o
        !          1701: \&.c.o:
        !          1702:        cc -o ${.TARGET} -c ${.IMPSRC}
        !          1703: .Ed
1.31      ross     1704: .El
1.1       cgd      1705: .Sh ENVIRONMENT
1.25      lukem    1706: .Nm
1.73      perry    1707: uses the following environment variables, if they exist:
1.16      christos 1708: .Ev MACHINE ,
1.26      hubertf  1709: .Ev MACHINE_ARCH ,
1.1       cgd      1710: .Ev MAKE ,
1.16      christos 1711: .Ev MAKEFLAGS ,
                   1712: .Ev MAKEOBJDIR ,
1.38      sjg      1713: .Ev MAKEOBJDIRPREFIX ,
1.76      jrf      1714: .Ev MAKESYSPATH ,
1.1       cgd      1715: and
1.16      christos 1716: .Ev PWD .
1.57      wiz      1717: .Pp
1.38      sjg      1718: .Ev MAKEOBJDIRPREFIX
1.117     lukem    1719: and
1.38      sjg      1720: .Ev MAKEOBJDIR
1.117     lukem    1721: may only be set in the environment or on the command line to
1.38      sjg      1722: .Nm
1.117     lukem    1723: and not as makefile variables;
                   1724: see the description of
                   1725: .Ql Va .OBJDIR
                   1726: for more details.
1.1       cgd      1727: .Sh FILES
                   1728: .Bl -tag -width /usr/share/mk -compact
                   1729: .It .depend
                   1730: list of dependencies
                   1731: .It Makefile
                   1732: list of dependencies
                   1733: .It makefile
                   1734: list of dependencies
                   1735: .It sys.mk
                   1736: system makefile
                   1737: .It /usr/share/mk
                   1738: system makefile directory
                   1739: .El
1.128     dsl      1740: .Sh COMPATIBILITY
                   1741: The basic make syntax is compatible between different versions of make,
                   1742: however the special variables, variable modifiers and conditionals are not.
                   1743: .Pp
1.129     wiz      1744: The way that parallel makes are scheduled changed in
1.130     wiz      1745: .Nx 4.0
1.129     wiz      1746: so that .ORDER and .WAIT apply recursively to the dependant nodes.
1.128     dsl      1747: The algorithms used may change again in the future.
1.1       cgd      1748: .Sh SEE ALSO
                   1749: .Xr mkdep 1
                   1750: .Sh HISTORY
                   1751: A
1.25      lukem    1752: .Nm
1.1       cgd      1753: command appeared in
                   1754: .At v7 .

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