mirror of https://github.com/odrling/Aegisub
79 lines
2.6 KiB
Plaintext
79 lines
2.6 KiB
Plaintext
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##### http://autoconf-archive.cryp.to/check_gnu_make.html
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#
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# SYNOPSIS
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#
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# 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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# the makefile variable `ifGNUmake' is set to the empty string,
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# otherwise it is set to "#". This is useful for including a special
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# features in a Makefile, which cannot be handled by other versions
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# of make. The variable _cv_gnu_make_command is set to the command to
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# invoke GNU make 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 $(DEPEND)
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# @ifGNUmake@ endif
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#
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# Then configure.in would normally contain:
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#
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# CHECK_GNU_MAKE()
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# AC_OUTPUT(Makefile)
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#
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# Then perhaps to cause gnu make to override any other make, we could
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# do something like this (note that GNU make always looks for
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# GNUmakefile first):
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#
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# if ! test x$_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 \ $_cv_gnu_make_command \$@ >> Makefile;
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# fi
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#
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# Then, if any (well almost any) other make is called, and GNU make
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# also exists, then the other make wraps the GNU make.
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#
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# LAST MODIFICATION
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#
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# 2002-01-04
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#
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# COPYLEFT
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#
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# Copyright (c) 2002 John Darrington <j.darrington@elvis.murdoch.edu.au>
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#
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# Copying and distribution of this file, with or without
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# modification, are permitted in any medium without royalty provided
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# the copyright notice and this notice are preserved.
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AC_DEFUN(
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[CHECK_GNU_MAKE], [ AC_CACHE_CHECK( for GNU make,_cv_gnu_make_command,
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_cv_gnu_make_command='' ;
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dnl Search all the common names for GNU make
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for a in "$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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