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Diff for /src/usr.bin/make/make.1 between version 1.174 and 1.175

version 1.174, 2010/06/06 17:28:48 version 1.175, 2010/06/09 16:58:22
Line 29 
Line 29 
 .\"  .\"
 .\"     from: @(#)make.1        8.4 (Berkeley) 3/19/94  .\"     from: @(#)make.1        8.4 (Berkeley) 3/19/94
 .\"  .\"
 .Dd June 6, 2010  .Dd June 9, 2010
 .Dt MAKE 1  .Dt MAKE 1
 .Os  .Os
 .Sh NAME  .Sh NAME
Line 536  If the result of expanding a variable co
Line 536  If the result of expanding a variable co
 .Pq Ql \&$  .Pq Ql \&$
 the string is expanded again.  the string is expanded again.
 .Pp  .Pp
 Variable substitution occurs at two distinct times, depending on where  Variable substitution occurs at three distinct times, depending on where
 the variable is being used.  the variable is being used.
   .Bl -enum
   .It
 Variables in dependency lines are expanded as the line is read.  Variables in dependency lines are expanded as the line is read.
   .It
 Variables in shell commands are expanded when the shell command is  Variables in shell commands are expanded when the shell command is
 executed.  executed.
   .It
   .Dq .for
   loop index variables are expanded on each loop iteration.
   Note that other variables are not expanded inside loops so
   the following example code:
   .Bd -literal -offset indent
   
   .Dv .for i in 1 2 3
   a+=     ${i}
   j=      ${i}
   b+=     ${j}
   .Dv .endfor
   
   all:
           @echo ${a}
           @echo ${b}
   
   .Ed
   will print:
   .Bd -literal -offset indent
   1 2 3
   3 3 3
   
   .Ed
   Because while ${a} contains
   .Dq 1 2 3
   after the loop is executed, ${b}
   contains
   .Dq ${j} ${j} ${j}
   which expands to
   .Dq 3 3 3
   since after the loop completes ${j} contains
   .Dq 3 .
   .El
 .Ss Variable classes  .Ss Variable classes
 The four different classes of variables (in order of increasing precedence)  The four different classes of variables (in order of increasing precedence)
 are:  are:

Legend:
Removed from v.1.174  
changed lines
  Added in v.1.175

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