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- # ===========================================================================
- # http://autoconf-archive.cryp.to/check_gnu_make.html
- # ===========================================================================
- #
- # SYNOPSIS
- #
- # CHECK_GNU_MAKE()
- #
- # DESCRIPTION
- #
- # 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.
- #
- # Here is an example of its use:
- #
- # Makefile.in might contain:
- #
- # # A failsafe way of putting a dependency rule into a makefile
- # $(DEPEND):
- # $(CC) -MM $(srcdir)/*.c > $(DEPEND)
- #
- # @ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND)))
- # @ifGNUmake@ include $(DEPEND)
- # @ifGNUmake@ endif
- #
- # Then configure.in would normally contain:
- #
- # CHECK_GNU_MAKE()
- # AC_OUTPUT(Makefile)
- #
- # Then perhaps to cause gnu make to override any other make, we could do
- # something like this (note that GNU make always looks for GNUmakefile
- # first):
- #
- # if ! test x$_cv_gnu_make_command = x ; then
- # mv Makefile GNUmakefile
- # echo .DEFAULT: > Makefile ;
- # echo \ $_cv_gnu_make_command \$@ >> Makefile;
- # fi
- #
- # Then, if any (well almost any) other make is called, and GNU make also
- # exists, then the other make wraps the GNU make.
- #
- # LAST MODIFICATION
- #
- # 2008-04-12
- #
- # COPYLEFT
- #
- # Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au>
- #
- # Copying and distribution of this file, with or without modification, are
- # permitted in any medium without royalty provided the copyright notice
- # and this notice are preserved.
- AC_DEFUN(
- [CHECK_GNU_MAKE], [ AC_CACHE_CHECK( for GNU make,_cv_gnu_make_command,
- _cv_gnu_make_command='' ;
- dnl Search all the common names for GNU make
- for a in "$MAKE" make gmake gnumake ; do
- if test -z "$a" ; then continue ; fi ;
- if ( sh -c "$a --version" 2> /dev/null | grep GNU 2>&1 > /dev/null ) ; then
- _cv_gnu_make_command=$a ;
- break;
- fi
- done ;
- ) ;
- dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise
- if test "x$_cv_gnu_make_command" != "x" ; then
- ifGNUmake='' ;
- else
- ifGNUmake='#' ;
- AC_MSG_RESULT("Not found");
- fi
- AC_SUBST(ifGNUmake)
- ] )
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