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95 lines
4.0 KiB
95 lines
4.0 KiB
# =========================================================================== |
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# https://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([run-if-true],[run-if-false]) |
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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: |
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# |
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# * The makefile variable `ifGNUmake' is set to the empty string, otherwise |
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# it 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. |
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# * The makefile variable `ifnGNUmake' is set to #, otherwise |
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# it is set to the empty string. This is useful for including a special |
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# features in a Makefile, which can be handled |
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# by other versions of make or to specify else like clause. |
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# * The variable `_cv_gnu_make_command` is set to the command to invoke |
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# GNU make if it exists, the empty string otherwise. |
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# * The variable `ax_cv_gnu_make_command` is set to the command to invoke |
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# GNU make by copying `_cv_gnu_make_command`, otherwise it is unset. |
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# * If GNU Make is found, its version is extracted from the output of |
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# `make --version` as the last field of a record of space-separated |
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# columns and saved into the variable `ax_check_gnu_make_version`. |
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# * Additionally if GNU Make is found, run shell code run-if-true |
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# else run shell code run-if-false. |
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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 $(DEPEND) |
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# @ifGNUmake@ else |
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# fallback code |
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# @ifGNUmake@ endif |
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# |
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# Then configure.in would normally contain: |
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# |
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# AX_CHECK_GNU_MAKE() |
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# AC_OUTPUT(Makefile) |
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# |
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# Then perhaps to cause gnu make to override any other make, we could do |
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# something like this (note that GNU make always looks for GNUmakefile |
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# first): |
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# |
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# if ! test x$_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 \ $_cv_gnu_make_command \$@ >> Makefile; |
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# fi |
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# |
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# Then, if any (well almost any) other make is called, and GNU make also |
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# exists, then the other make wraps the GNU make. |
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# |
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# LICENSE |
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# |
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# Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au> |
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# Copyright (c) 2015 Enrico M. Crisostomo <enrico.m.crisostomo@gmail.com> |
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# |
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# Copying and distribution of this file, with or without modification, are |
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# permitted in any medium without royalty provided the copyright notice |
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# and this notice are preserved. This file is offered as-is, without any |
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# warranty. |
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#serial 12 |
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AC_DEFUN([AX_CHECK_GNU_MAKE],dnl |
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[AC_PROG_AWK |
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AC_CACHE_CHECK([for GNU make],[_cv_gnu_make_command],[dnl |
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_cv_gnu_make_command="" ; |
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dnl Search all the common names for GNU make |
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for a in "$MAKE" make gmake gnumake ; do |
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if test -z "$a" ; then continue ; fi ; |
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if "$a" --version 2> /dev/null | grep GNU 2>&1 > /dev/null ; then |
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_cv_gnu_make_command=$a ; |
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AX_CHECK_GNU_MAKE_HEADLINE=$("$a" --version 2> /dev/null | grep "GNU Make") |
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ax_check_gnu_make_version=$(echo ${AX_CHECK_GNU_MAKE_HEADLINE} | ${AWK} -F " " '{ print $(NF); }') |
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break ; |
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fi |
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done ;]) |
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dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise |
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AS_VAR_IF([_cv_gnu_make_command], [""], [AS_VAR_SET([ifGNUmake], ["#"])], [AS_VAR_SET([ifGNUmake], [""])]) |
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AS_VAR_IF([_cv_gnu_make_command], [""], [AS_VAR_SET([ifnGNUmake], [""])], [AS_VAR_SET([ifnGNUmake], ["#"])]) |
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AS_VAR_IF([_cv_gnu_make_command], [""], [AS_UNSET(ax_cv_gnu_make_command)], [AS_VAR_SET([ax_cv_gnu_make_command], [${_cv_gnu_make_command}])]) |
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AS_VAR_IF([_cv_gnu_make_command], [""],[$2],[$1]) |
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AC_SUBST([ifGNUmake]) |
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AC_SUBST([ifnGNUmake]) |
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])
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