85 lines
3.3 KiB
Plaintext
85 lines
3.3 KiB
Plaintext
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# ===========================================================================
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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:
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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 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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#
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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 \ $_cv_gnu_make_command \$@ >> Makefile;
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# fi
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#
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# Then, if any (well almost any) other make is called, and GNU make also
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# exists, then the other make wraps the GNU make.
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#
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# LICENSE
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#
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# Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au>
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# Copyright (c) 2015 Enrico M. Crisostomo <enrico.m.crisostomo@gmail.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 8
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AC_DEFUN([AX_CHECK_GNU_MAKE],dnl
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[AC_PROG_AWK
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AC_CACHE_CHECK([for GNU make],[_cv_gnu_make_command],[dnl
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_cv_gnu_make_command="" ;
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dnl Search all the common names for GNU make
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for a in "$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 $(NF); }')
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break ;
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fi
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done ;])
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dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise
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AS_VAR_IF([_cv_gnu_make_command], [""], [AS_VAR_SET([ifGNUmake], ["#"])], [AS_VAR_SET([ifGNUmake], [""])])
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AS_VAR_IF([_cv_gnu_make_command], [""], [AS_UNSET(ax_cv_gnu_make_command)], [AS_VAR_SET([ax_cv_gnu_make_command], [${_cv_gnu_make_command}])])
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AC_SUBST([ifGNUmake])
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])
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