mirror of
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79 lines
2.8 KiB
Plaintext
79 lines
2.8 KiB
Plaintext
# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_check_gnu_make.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CHECK_GNU_MAKE()
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#
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# DESCRIPTION
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#
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# This macro searches for a GNU version of make. If a match is found, the
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# makefile variable `ifGNUmake' is set to the empty string, otherwise it
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# is set to "#". This is useful for including a special features in a
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# Makefile, which cannot be handled by other versions of make. The
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# variable _cv_gnu_make_command is set to the command to invoke GNU make
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# if it exists, the empty string otherwise.
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#
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# Here is an example of its use:
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#
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# Makefile.in might contain:
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#
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# # A failsafe way of putting a dependency rule into a makefile
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# $(DEPEND):
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# $(CC) -MM $(srcdir)/*.c > $(DEPEND)
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#
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# @ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND)))
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# @ifGNUmake@ include $(DEPEND)
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# @ifGNUmake@ endif
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#
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# Then configure.in would normally contain:
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#
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# AX_CHECK_GNU_MAKE()
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# AC_OUTPUT(Makefile)
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#
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# Then perhaps to cause gnu make to override any other make, we could do
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# something like this (note that GNU make always looks for GNUmakefile
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# first):
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#
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# if ! test x$_cv_gnu_make_command = x ; then
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# mv Makefile GNUmakefile
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# echo .DEFAULT: > Makefile ;
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# echo \ $_cv_gnu_make_command \$@ >> Makefile;
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# fi
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#
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# Then, if any (well almost any) other make is called, and GNU make also
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# exists, then the other make wraps the GNU make.
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#
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# LICENSE
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#
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# Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 7
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AC_DEFUN([AX_CHECK_GNU_MAKE], [ AC_CACHE_CHECK( for GNU make,_cv_gnu_make_command,
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_cv_gnu_make_command='' ;
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dnl Search all the common names for GNU make
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for a in "$MAKE" make gmake gnumake ; do
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if test -z "$a" ; then continue ; fi ;
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if ( sh -c "$a --version" 2> /dev/null | grep GNU 2>&1 > /dev/null ) ; then
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_cv_gnu_make_command=$a ;
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break;
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fi
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done ;
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) ;
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dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise
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if test "x$_cv_gnu_make_command" != "x" ; then
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ifGNUmake='' ;
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else
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ifGNUmake='#' ;
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AC_MSG_RESULT("Not found");
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fi
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AC_SUBST(ifGNUmake)
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] )
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