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Autoconf Macro: check_gnu_make
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<h1>
check_gnu_make
</h1>
<h2>
SYNOPSIS
</h2>
<p class="indent" style="white-space:nowrap;">
<code>CHECK_GNU_MAKE()</code>
</p>
<h2>
DESCRIPTION
</h2>
<div class="indent">
<p>
This macro searches for a GNU version of make. If a match is found, the
makefile variable `ifGNUmake' is set to the empty string, otherwise it is
set to "#". This is useful for including a special features in a Makefile,
which cannot be handled by other versions of make. The variable
_cv_gnu_make_command is set to the command to invoke GNU make if it exists,
the empty string otherwise.
</p>
<p>
Here is an example of its use:
</p>
<p>
Makefile.in might contain:
</p>
<pre>
# A failsafe way of putting a dependency rule into a makefile
$(DEPEND):
$(CC) -MM $(srcdir)/*.c > $(DEPEND)
@ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND)))
@ifGNUmake@ include $(DEPEND)
@ifGNUmake@ endif
</pre>
<p>
Then configure.in would normally contain:
</p>
<pre>
CHECK_GNU_MAKE()
AC_OUTPUT(Makefile)
</pre>
<p>
Then perhaps to cause gnu make to override any other make, we could do
something like this (note that GNU make always looks for GNUmakefile
first):
</p>
<pre>
if ! test x$_cv_gnu_make_command = x ; then
mv Makefile GNUmakefile
echo .DEFAULT: > Makefile ;
echo \ $_cv_gnu_make_command \$@ >> Makefile;
fi
</pre>
<p>
Then, if any (well almost any) other make is called, and GNU make also
exists, then the other make wraps the GNU make.
</p>
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<h2>
SOURCE CODE
</h2>
<p class="indent">
<a href=
"http://autoconf-archive.cryp.to/check_gnu_make.m4">http://autoconf-archive.cryp.to/check_gnu_make.m4</a>
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<h2>
LICENSE
</h2>
<div class="indent">
<p style="white-space:nowrap;">
Copyright © 2008 John Darrington
<j.darrington@elvis.murdoch.edu.au>
</p>
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Copying and distribution of this file, with or without modification, are
permitted in any medium without royalty provided the copyright notice and
this notice are preserved.
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