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Copy from GNU Autoconf Archive git master. FYI, ax_check_gnu_make.m4 is missing on cygwin.
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# =========================================================================== | ||
# http://www.gnu.org/software/autoconf-archive/ax_check_gnu_make.html | ||
# =========================================================================== | ||
# | ||
# SYNOPSIS | ||
# | ||
# AX_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 $(DEPEND) | ||
# @ifGNUmake@ endif | ||
# | ||
# Then configure.in would normally contain: | ||
# | ||
# AX_CHECK_GNU_MAKE() | ||
# AC_OUTPUT(Makefile) | ||
# | ||
# Then perhaps to cause gnu make to override any other make, we could do | ||
# something like this (note that GNU make always looks for GNUmakefile | ||
# first): | ||
# | ||
# if ! test x$_cv_gnu_make_command = x ; then | ||
# mv Makefile GNUmakefile | ||
# echo .DEFAULT: > Makefile ; | ||
# echo \ $_cv_gnu_make_command \$@ >> Makefile; | ||
# fi | ||
# | ||
# Then, if any (well almost any) other make is called, and GNU make also | ||
# exists, then the other make wraps the GNU make. | ||
# | ||
# LICENSE | ||
# | ||
# Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au> | ||
# | ||
# Copying and distribution of this file, with or without modification, are | ||
# permitted in any medium without royalty provided the copyright notice | ||
# and this notice are preserved. This file is offered as-is, without any | ||
# warranty. | ||
|
||
#serial 7 | ||
|
||
AC_DEFUN([AX_CHECK_GNU_MAKE], [ AC_CACHE_CHECK( for GNU make,_cv_gnu_make_command, | ||
_cv_gnu_make_command='' ; | ||
dnl Search all the common names for GNU make | ||
for a in "$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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