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* doc/make.texi (Automatic Variables): Relocate the $? example

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Mike Frysinger 2021-03-25 01:18:30 -04:00 committed by Paul Smith
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commit 76a099997b
1 changed files with 12 additions and 12 deletions
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doc/make.texi
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@ -10243,6 +10243,18 @@ The names of all the prerequisites that are newer than the target, with
spaces between them. If the target does not exist, all prerequisites
will be included. For prerequisites which are archive members, only the
named member is used (@pxref{Archives}).
@samp{$?} is useful even in explicit rules when you wish to operate on only
the prerequisites that have changed. For example, suppose that an archive
named @file{lib} is supposed to contain copies of several object files.
This rule copies just the changed object files into the archive:
@example
@group
lib: foo.o bar.o lose.o win.o
ar r lib $?
@end group
@end example
@cindex prerequisites, list of changed
@cindex list of changed prerequisites
@ -10299,18 +10311,6 @@ If the target name in an explicit rule does not end with a recognized
suffix, @samp{$*} is set to the empty string for that rule.
@end table
@samp{$?} is useful even in explicit rules when you wish to operate on only
the prerequisites that have changed. For example, suppose that an archive
named @file{lib} is supposed to contain copies of several object files.
This rule copies just the changed object files into the archive:
@example
@group
lib: foo.o bar.o lose.o win.o
ar r lib $?
@end group
@end example
Of the variables listed above, four have values that are single file
names, and three have values that are lists of file names. These
seven have variants that get just the file's directory name or just