Annotation of src/BUILDING.mdoc, Revision 1.2
1.2 ! tv 1: .\" $NetBSD: BUILDING.mdoc,v 1.1 2001/10/29 19:46:47 tv Exp $
1.1 tv 2: .\"
3: .\" Copyright (c) 2001 The NetBSD Foundation, Inc.
4: .\" All rights reserved.
5: .\"
6: .\" This code is derived from software contributed to The NetBSD Foundation
7: .\" by Todd Vierling.
8: .\"
9: .\" Redistribution and use in source and binary forms, with or without
10: .\" modification, are permitted provided that the following conditions
11: .\" are met:
12: .\" 1. Redistributions of source code must retain the above copyright
13: .\" notice, this list of conditions and the following disclaimer.
14: .\" 2. Redistributions in binary form must reproduce the above copyright
15: .\" notice, this list of conditions and the following disclaimer in the
16: .\" documentation and/or other materials provided with the distribution.
17: .\" 3. All advertising materials mentioning features or use of this software
18: .\" must display the following acknowledgement:
19: .\" This product includes software developed by the NetBSD
20: .\" Foundation, Inc. and its contributors.
21: .\" 4. Neither the name of The NetBSD Foundation nor the names of its
22: .\" contributors may be used to endorse or promote products derived
23: .\" from this software without specific prior written permission.
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25: .\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
26: .\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27: .\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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30: .\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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32: .\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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1.2 ! tv 37: .\" =====
! 38: .\" NOTE: After changing this file, run "make build-docs" to generate the
! 39: .\" proper plaintext versions, and check in all BUILDING.* files!
! 40: .\"
1.1 tv 41: .Dd October 29, 2001
42: .Dt BUILDING 8
43: .Os NetBSD
44: .
45: .Sh NAME
46: .
47: .Nm BUILDING
48: .Nd Procedure for building
49: .Nx
50: from source code.
51: .
52: .Sh STATUS
53: .
54: This document is a work-in-progress. As such, the information described
55: here may not match the reality of the build system as of this writing.
56: Once this document is completely in sync with reality, this paragraph
57: will be removed.
58: .Pp
59: Discrepancies between this documentation and the current reality of
60: implementation are noted specially, as with the note below:
61: .Pp
62: .Em Note :
63: This document applies only to platforms which use the new toolchain as
64: indicated by the setting of
65: .Sy USE_NEW_TOOLCHAIN
66: in
67: .Sy /etc/mk.conf
68: or
69: .Aq bsd.own.mk .
70: Platforms which have not yet been switched to the new toolchain should
71: continue building traditionally, using the notes specified in the file
72: .Sy UPDATING .
73: .
74: .Sh REQUIREMENTS
75: .
76: .Nx
77: is designed to be buildable on most POSIX-compliant host systems.
78: The basic build procedure is the same whether compiling
79: .Em natively
80: (on the same
81: .Nx
82: architecture) or
83: .Em cross compiling
84: (on another architecture or OS).
85: .Pp
86: This source tree contains a special subtree,
87: .Dq tools ,
88: which uses the host system to create a build toolchain for the target
89: architecture. The host system must have at least C and C++
90: compilers in order to create the toolchain
91: .Nm ( make
92: is not required); all other tools are created as part of the
93: .Nx
94: build process.
95: .Pp
96: .Bd -ragged -offset indent
97: .Em Note :
98: A couple host toolchain components are not yet available in the tools
99: directory. Also, some tools use non-POSIX, non-ANSI C extensions
100: and need to be standardized. As a result, cross-compiling from
101: systems other than
102: .Nx
103: is not currently supported.
104: .Ed
105: .
106: .Sh FILES
107: .
108: .Ss Source tree layout
109: .
110: .Bl -tag -width "BUILDING.mdoc"
111: .It Sy BUILDING.mdoc
1.2 ! tv 112: This document (in -mdoc troff format; the original copy).
! 113: .It Sy BUILDING.html
! 114: This document (in formatted HTML).
! 115: .It Sy BUILDING.txt
! 116: This document (in plaintext).
1.1 tv 117: .It Sy Makefile
118: The main Makefile for
119: .Nx ;
120: should only be run for native builds with an appropriately up-to-date
121: version of
122: .Nx
123: .Xr make 1 .
124: (For building from out-of-date systems or on a non-native host, see the
125: .Nm build.sh
126: shell script.)
127: .It Sy UPDATING
128: Special notes for updating from an earlier revision of
129: .Nx .
130: It is important to read this file before every build of an updated
131: source tree.
132: .It Sy build.sh
133: Bourne-compatible shell script used for building the host build tools
134: and the
135: .Nx
136: system from scratch. Can be used for both native and cross builds, and
137: should be used instead of
138: .Xr make 1
139: for any source tree that is updated and recompiled regularly.
140: .It Sy crypto/dist/ , dist/ , gnu/dist/
141: Sources imported verbatim from third parties, without mangling the
142: existing build structure. Other source trees in
143: .Sy bin
144: through
145: .Sy usr.sbin
146: use the
147: .Nx
148: .Xr make 1
149: .Dq reachover
150: Makefile semantics when building these programs for a native host.
151: .It Sy distrib/ , etc/
152: Sources for items used when making a full release snapshot, such as
153: files installed in
154: .Sy /etc
155: on the destination system, boot media, and release notes.
156: .It Sy regress/
157: Regression test harness. Can be cross-compiled, but only run natively.
158: .It Sy sys/
159: .Nx
160: kernel sources.
161: .It Sy tools/
162: .Dq Reachover
163: build structure for the host build tools. This has a special method of
164: determining out-of-date status.
165: .It Sy bin/ ... usr.sbin/
166: Sources to the
167: .Nx
168: userland (non-kernel) programs. If any of these directories are
169: missing, they will be skipped during the build.
170: .El
171: .
172: .Ss Build tree layout
173: .
174: The
175: .Nx
176: build tree is described in
177: .Xr hier 7 ,
178: and the release layout is described in
179: .Xr release 7 .
180: .Pp
181: .
182: .Sh CONFIGURATION
183: .
184: .Ss "make" variables
185: .
186: .de YorN
187: Can be set to
188: .Dq yes
189: or
190: .Dq no .
191: ..
192: .de DFLT
193: .Pp
194: .Em Default :
195: ..
196: .de DFLTu
197: .DFLT
198: Unset.
199: ..
200: .de DFLTy
201: .DFLT
202: .Dq yes
203: ..
204: .de DFLTn
205: .DFLT
206: .Dq no
207: ..
208: Several variables control the behavior of
209: .Nx
210: builds. Unless otherwise specified, these variables may be set in
211: either the process environment or the
212: .Xr make 1
213: configuration file specified by
214: .Sy MAKECONF .
215: .
216: .Bl -tag -width "MKCATPAGES"
217: .
218: .It Sy DESTDIR
219: Directory to contain the built
220: .Nx
221: system. If set, special options are passed to the compilation tools to
222: prevent their default use of the host system's
223: .Sy /usr/include , /usr/lib ,
224: and so forth. This pathname should
225: .Em not
226: end with a slash
227: .Pq /
228: character (for installation into the system's root directory, set
229: .Sy DESTDIR
230: to an empty string).
231: .DFLT
232: Empty string if
233: .Sy USETOOLS
234: is
235: .Dq yes ;
236: unset otherwise.
237: .
238: .It Sy MAKECONF
239: The name of the
240: .Xr make 1
241: configuration file.
242: .Em Only settable in the process environment.
243: .DFLT
244: .Dq /etc/mk.conf
245: .
246: .It Sy MKCATPAGES
247: .YorN
248: Indicates whether preformatted plaintext manual pages will be created
249: during a build.
250: .DFLTy
251: .
252: .It Sy MKCRYPTO
253: .YorN
254: Indicates whether cryptographic code will be included in a build;
255: provided for the benefit of countries that do not allow strong
256: cryptography. Will not affect use of the standard low-security password
257: encryption system,
258: .Xr crypt 3 .
259: .DFLTy
260: .
261: .It Sy MKDOC
262: .YorN
263: Indicates whether system documentation destined for
264: .Sy /usr/share/doc
265: will be installed during a build.
266: .DFLTy
267: .
268: .It Sy MKINFO
269: .YorN
270: Indicates whether GNU Info files, used for the documentation for
271: most of the compilation tools, will be created and installed during a
272: build.
273: .DFLTy
274: .
275: .It Sy MKLINT
276: .YorN
277: Indicates whether
278: .Xr lint 1
279: will be run against portions of the
280: .Nx
281: source code during the build, and whether lint libraries will be
282: installed into
283: .Sy /usr/libdata/lint .
284: .DFLTy
285: .
286: .It Sy MKMAN
287: .YorN
288: Indicates whether manual pages will be installed during a build.
289: .DFLTy
290: .
291: .It Sy MKNLS
292: .YorN
293: Indicates whether Native Language System locale zone files will be
294: compiled and installed during a build.
295: .DFLTy
296: .
297: .It Sy MKOBJ
298: .YorN
299: Indicates whether object directories will be created when running
300: .Dq make obj .
301: If set to
302: .Dq no ,
303: then all built files will be located inside the regular source tree.
304: .DFLTy
305: .
306: .It Sy MKPIC
307: .YorN
308: Indicates whether shared objects and libraries will be created and
309: installed during a build. If set to
310: .Dq no ,
311: the entire built system will be statically linked.
312: .DFLT
313: Platform dependent. As of this writing, all platforms except
314: .Sy sh3
315: default to
316: .Dq yes .
317: .
318: .It Sy MKPICINSTALL
319: .YorN
320: Indicates whether the
321: .Xr ar 1
322: format libraries
323: .Sy ( lib*_pic.a ) ,
324: used to generate shared libraries, are installed during a build.
325: .DFLTy
326: .
327: .It Sy MKPROFILE
328: .YorN
329: Indicates whether profiled libraries
330: .Sy ( lib*_p.a )
331: will be built and installed during a build.
332: .DFLT
333: .Dq yes ;
334: however, some platforms turn off
335: .Sy MKPROFILE
336: by default at times due to toolchain problems with profiled code.
337: .
338: .It Sy MKSHARE
339: .YorN
340: Indicates whether files destined to reside in
341: .Sy /usr/share
342: will be built and installed during a build. If set to
343: .Dq no ,
344: then all of
345: .Sy MKCATPAGES , MKDOC , MKINFO , MKMAN ,
346: and
347: .Sy MKNLS
348: will be set to
349: .Dq no
350: unconditionally.
351: .DFLTy
352: .
353: .It Sy TOOLDIR
354: Directory to hold the host tools, once built. This directory should be
355: unique to a given host system and
356: .Nx
357: source tree. (However, multiple targets may share the same
358: .Sy TOOLDIR ;
359: the target-dependent files have unique names.) Must be set if USETOOLS
360: is
361: .Dq yes .
362: .DFLTu
363: .
364: .It Sy UPDATE
365: If set, then all install operations intended to write to
366: .Sy DESTDIR
367: will compare file timestamps before installing, and skip the install
368: phase if the destination files are up-to-date. This also has
369: implications on full builds (see next subsection).
370: .DFLTu
371: .
372: .It Sy USETOOLS
373: Indicates whether the tools specified by
374: .Sy TOOLDIR
375: should be used as part of a build in progress. Must be set to
376: .Dq yes
377: if cross-compiling.
378: .Bl -tag -width "never"
379: .It Sy yes
380: Use the tools from
381: .Sy TOOLDIR .
382: .It Sy no
383: Do not use the tools from
384: .Sy TOOLDIR ,
385: but refuse to build native compilation tool components that are
386: version-specific for that tool.
387: .It Sy never
388: Do not use the tools from
389: .Sy TOOLDIR ,
390: even when building native tool components. This is similar to the
391: traditional
392: .Nx
393: build method, but does
394: .Em not
395: verify that the compilation tools in use are up-to-date enough in order
396: to build the tree successfully. This may cause build or runtime
397: problems when building the whole
398: .Nx
399: source tree.
400: .El
401: .DFLT
402: .Dq yes
403: if building all or part of a whole
404: .Nx
405: source tree (detected automatically);
406: .Dq no
407: otherwise (to preserve traditional semantics of the
408: .Aq bsd.*.mk
409: .Xr make 1
410: include files).
411: .Pp
412: .Em Note :
413: Currently, the
414: .Dq no
415: option functions similarly to the
416: .Dq never
417: option. Proper checks will be added in the near future to add the
418: described functionality for version-specific tool components.
419: .
420: .El
421: .
422: .Ss "make" variables for full builds
423: These variables only affect the top level
424: .Dq Makefile
425: and do not manually building subtrees of the
426: .Nx
427: source code.
428: .
429: .Bl -tag -width "NODISTRIBDIRS"
430: .
431: .It Sy MKOBJDIRS
432: .YorN
433: Indicates whether object directories will be created automatically
434: (via a
435: .Dq make obj
436: pass) at the start of a build.
437: .DFLTy
438: .
439: .It Sy MKTOOLS
440: Indicates whether the host tools will be built and installed
441: automatically if they are out-of-date.
442: .Bl -tag -width "never"
443: .It Sy yes
444: Build tools as needed into
445: .Sy TOOLDIR ,
446: but only if the tools in question are out-of-date.
447: .It Sy no
448: Do not update the tools in
449: .Sy TOOLDIR ;
450: halt the build as a safety precaution if tools are out-of-date.
451: .It Sy always
452: Always rebuild the tools in
453: .Sy TOOLDIR
454: from scratch during a build. This is similar to the standard
455: .Nx
456: source tree build method, but is not typically required for host tools.
457: .El
458: .DFLTn
459: .
460: .It Sy NBUILDJOBS
461: If set, specifies the number of parallel
462: .Xr make 1
463: processes that should be run simultaneously. This can speed up builds
464: on SMP machines, or machines with much more CPU power than I/O
465: availability. This should be used
466: .Em instead
467: of the
468: .Xr make 1
469: option
470: .Sy -j ,
471: in order to ensure proper ordering of build components.
472: .DFLTu
473: .
474: .It Sy NOCLEANDIR
475: If set, avoids the
476: .Dq make cleandir
477: phase of a full build. This has the effect of allowing only changed
478: files in a source tree to be recompiled. This can speed up builds when
479: updating only a few files in the tree.
480: .DFLTu
481: .
482: .It Sy NODISTRIBDIRS
483: If set, avoids the
484: .Dq make distrib-dirs
485: phase of a full build. This skips running
486: .Xr mtree 1
487: on
488: .Sy DESTDIR ,
489: useful on systems where building as an unprivileged user, or where it is
490: known that the system-wide mtree files have not changed.
491: .DFLTu
492: .
493: .It Sy NOINCLUDES
494: If set, avoids the
495: .Dq make includes
496: phase of a full build. This has the effect of preventing
497: .Xr make 1
498: from thinking that some programs are out-of-date simply because the
499: system include files have changed. However, this option should not be
500: used when updating the entire
501: .Nx
502: source tree arbitrarily; it is suggested to use
503: .Sy UPDATE
504: in that case.
505: .DFLTu
506: .
507: .It Sy RELEASEDIR
508: If set, specifies the directory to which a
509: .Xr release 7
510: layout will be written at the end of a
511: .Dq make release .
512: .DFLTu
513: .
514: .It Sy UPDATE
515: If set, then in addition to the effects described for UPDATE above, this
516: implies the effects of
517: .Sy NOCLEANDIR .
518: .
519: .El
520: .
521: .Sh BUILDING
522: .
523: .Ss "make" command line options
524: This is only a summary of options available to
525: .Xr make 1 ;
526: only the options used most frequently with
527: .Nx
528: builds are listed here.
529: .
530: .Bl -tag -width "var=value"
531: .
532: .It Sy -m Em dir
533: Specify the default directory for searching for system Makefile
534: segments, mainly the
535: .Aq bsd.*.mk
536: files. When building any full
537: .Nx
538: source tree, this should be set to the
539: .Dq share/mk
540: directory in the source tree. (This is set automatically when building
541: from the top level.)
542: .
543: .It Sy -n
544: Display the commands that would have been executed, but do not
545: actually execute them. This will still cause recursion to take place.
546: .
547: .It Sy -v Em var
548: Print
549: .Xr make 1 's
550: idea of the value of
551: .Em var .
552: Does not build any targets.
553: .
554: .It Em var=value
555: Set the variable
556: .Em var
557: to
558: .Em value ,
559: overriding any setting specified by the process environment, the
560: .Sy MAKECONF
561: configuration file, or the system Makefile segments.
562: .
563: .El
564: .
565: .Ss "make" targets
566: .
567: These default targets may be built by running
568: .Xr make 1
569: in any subtree of the
570: .Nx
571: source code. It is recommended that none of these be used from the top
572: level Makefile; as a specific exception,
573: .Dq make obj
574: and
575: .Dq make cleandir
576: are useful in that context.
577: .
578: .Bl -tag -width "dependall"
579: .
580: .It Sy all
581: Build programs, libraries, and preformatted documentation.
582: .
583: .It Sy clean
584: Remove program and library object code files.
585: .
586: .It Sy cleandir
587: Same as
588: .Sy clean ,
589: but also remove preformatted documentation, dependency files generated
590: by
591: .Dq make depend ,
592: and any other files known to be created at build time.
593: .Dq make distclean
594: may be used as a synonym, for familiarity with a similar well-known
595: convention.
596: .
597: .It Sy depend
598: Create dependency files
599: .Sy ( .depend )
600: containing more detailed information about the dependencies of source
601: code on header files. Allows programs to be recompiled automatically
602: when a dependency changes.
603: .
604: .It Sy dependall
605: Does a
606: .Dq make depend
607: immediately followed by a
608: .Dq make all .
609: This combined target recurses as an atomic unit, so that the
610: .Dq make depend
611: phase can participate in
612: .Sy make -j
613: parallelism.
614: .
615: .It Sy includes
616: Build and install system header files. Typically needed before any
617: system libraries or programs can be built.
618: .
619: .It Sy install
620: Install programs, libraries, and documentation into
621: .Sy DESTDIR .
622: .
623: .It Sy lint
624: Run
625: .Xr lint 1
626: against the C source code, where appropriate, and generate
627: system-installed lint libraries.
628: .
629: .It Sy obj
630: Create object directories to be used for built files, instead of
631: building directly in the source tree.
632: .
633: .It Sy tags
634: Create
635: .Xr ctags 1
636: searchable function lists usable by the
637: .Xr ex 1
638: and
639: .Xr vi 1
640: text editors.
641: .
642: .El
643: .
644: .Ss "make" targets for the top level
645: .
646: Additional
647: .Xr make 1
648: targets are usable specifically from the top source level to facilitate
649: building the entire
650: .Nx
651: source tree.
652: .
653: .Bl -tag -width "dependall"
654: .
655: .It Sy build
656: Build the entire
657: .Nx
658: system. This orders portions of the source tree such that prerequisites
659: will be built in the proper order.
660: .
661: .It Sy release
662: Do a
663: .Dq make build ,
664: then package the system into a standard release layout as described by
665: .Xr release 7 .
666: This requires that
667: .Sy RELEASEDIR
668: be set (see above).
669: .
670: .It Sy regression-tests
671: Can only be run after building the regression tests in the directory
672: .Dq regress .
673: Runs the compiled regression tests on the local host.
674: .
675: .El
676: .
677: .Ss The "build.sh" script
678: .
679: This script file is a Bourne shell script designed to build the
680: entire
681: .Nx
682: system on any host with a Bourne shell in
683: .Sy /bin/sh ,
684: including many that are not POSIX compliant. Note that if a host
685: system's
686: .Sy /bin/sh
687: is unusually old and broken, the Korn Shell
688: .Sy ( /bin/ksh ) ,
689: if available, may be a usable alternative.
690: .Pp
691: All cross-compile builds, and most native builds, of the entire system
692: should make use of
693: .Sy build.sh
694: rather than just running
695: .Dq make .
696: This way, the
697: .Xr make 1
698: program will be bootstrapped properly, in case the host system has an
699: older or incompatible
700: .Dq make
701: program.
702: .Pp
703: When compiling the entire system via
704: .Sy build.sh ,
705: many
706: .Xr make 1
707: variables are set for you in order to help encapsulate the build
708: process. In particular, both
709: .Sy USETOOLS
710: and
711: .Sy MKTOOLS
712: are set to
713: .Dq yes ,
714: and
715: .Sy MACHINE_ARCH
716: (if unset) is deduced from the value of
717: .Sy MACHINE .
718: .Pp
719: The variables
720: .Sy DESTDIR , MACHINE , MACHINE_ARCH ,
721: and
722: .Sy TOOLDIR
723: are required in order for
724: .Sy build.sh
725: to function, and thus they cannot be set in the configuration file
726: specified by
727: .Sy MAKECONF .
728: They may be set either in the process environment, or via command line
729: options to
730: .Sy build.sh .
731: .Pp
732: The following are available command line options that may be supplied to
733: .Sy build.sh :
734: .
735: .Bl -tag -width "-T tools"
736: .
737: .It Sy -a Em arch
738: Set the value of
739: .Sy MACHINE_ARCH
740: to
741: .Em arch .
742: .
743: .It Sy -D Em dest
744: Set the value of
745: .Sy DESTDIR
746: to
747: .Em dest .
748: .
749: .It Sy -j Em njob
750: Set the value of
751: .Sy NBUILDJOBS
752: to
753: .Em njob .
754: This provides similar functionality to the familiar
755: .Dq make -j ,
756: but preserves the ordering of the top level
757: .Dq make build .
758: .
759: .It Sy -m Em mach
760: Set the value of
761: .Sy MACHINE
762: to
763: .Em mach .
764: This will also override any value of
765: .Sy MACHINE_ARCH
766: in the process environment with a value deduced from
767: .Em mach ,
768: unless
769: .Sy -a
770: is specified.
771: .
772: .It Sy -R Em rel
773: Set the value of
774: .Sy RELEASEDIR
775: to
776: .Em rel .
777: Setting this option will make
778: .Sy build.sh
779: run
780: .Dq make release
781: instead of
782: .Dq make build .
783: .
784: .It Sy -r
785: Remove the contents of
786: .Sy DESTDIR
787: and
788: .Sy TOOLDIR
789: before building (provides a clean starting point).
790: .
791: .It Sy -T Em tools
792: Set the value of
793: .Sy TOOLDIR
794: to
795: .Em tools .
796: .
797: .El
798: .
799: .Sh The "nbmake-MACHINE" wrapper script
800: .
801: If using the
802: .Sy build.sh
803: script to build
804: .Nx ,
805: a
806: .Sy nbmake-MACHINE
807: script will be created in
808: .Sy TOOLDIR/bin
809: upon the first build to assist in building subtrees on a cross-compile
810: host.
811: .Pp
812: .Sy nbmake-MACHINE
813: can be invoked in lieu of
814: .Xr make 1 ,
815: and will instead call the up-to-date version of
816: .Dq nbmake
817: installed into
818: .Sy TOOLDIR/bin
819: with several key variables pre-set, including
820: .Sy MACHINE , MACHINE_ARCH ,
821: and
822: .Sy TOOLDIR .
823: This script can be symlinked into a directory listed in
824: .Sy PATH ,
825: or called with an absolute path.
826: .
827: .Sh SEE ALSO
828: .Xr make 1 ,
829: .Xr hier 7 ,
830: .Xr release 7
831: .
832: .Sh BUGS
833: .
834: Many platforms are not yet using the
835: .Sy USE_NEW_TOOLCHAIN
836: system.
837: .
838: .Sh HISTORY
839: .
840: The
841: .Sy USE_NEW_TOOLCHAIN
842: based build scheme was introduced in the
843: .Dq NetBSD-current
844: development sources between
845: .Nx 1.5
846: and
847: .Nx 1.6.
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