| Matt Turner | 691bd9b | 2014-09-21 13:32:35 -0700 | [diff] [blame] | 1 | # =========================================================================== |
| 2 | # http://www.gnu.org/software/autoconf-archive/ax_check_gnu_make.html |
| 3 | # =========================================================================== |
| 4 | # |
| 5 | # SYNOPSIS |
| 6 | # |
| 7 | # AX_CHECK_GNU_MAKE() |
| 8 | # |
| 9 | # DESCRIPTION |
| 10 | # |
| 11 | # This macro searches for a GNU version of make. If a match is found, the |
| 12 | # makefile variable `ifGNUmake' is set to the empty string, otherwise it |
| 13 | # is set to "#". This is useful for including a special features in a |
| 14 | # Makefile, which cannot be handled by other versions of make. The |
| 15 | # variable _cv_gnu_make_command is set to the command to invoke GNU make |
| 16 | # if it exists, the empty string otherwise. |
| 17 | # |
| 18 | # Here is an example of its use: |
| 19 | # |
| 20 | # Makefile.in might contain: |
| 21 | # |
| 22 | # # A failsafe way of putting a dependency rule into a makefile |
| 23 | # $(DEPEND): |
| 24 | # $(CC) -MM $(srcdir)/*.c > $(DEPEND) |
| 25 | # |
| 26 | # @ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND))) |
| 27 | # @ifGNUmake@ include $(DEPEND) |
| 28 | # @ifGNUmake@ endif |
| 29 | # |
| 30 | # Then configure.in would normally contain: |
| 31 | # |
| 32 | # AX_CHECK_GNU_MAKE() |
| 33 | # AC_OUTPUT(Makefile) |
| 34 | # |
| 35 | # Then perhaps to cause gnu make to override any other make, we could do |
| 36 | # something like this (note that GNU make always looks for GNUmakefile |
| 37 | # first): |
| 38 | # |
| 39 | # if ! test x$_cv_gnu_make_command = x ; then |
| 40 | # mv Makefile GNUmakefile |
| 41 | # echo .DEFAULT: > Makefile ; |
| 42 | # echo \ $_cv_gnu_make_command \$@ >> Makefile; |
| 43 | # fi |
| 44 | # |
| 45 | # Then, if any (well almost any) other make is called, and GNU make also |
| 46 | # exists, then the other make wraps the GNU make. |
| 47 | # |
| 48 | # LICENSE |
| 49 | # |
| 50 | # Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au> |
| 51 | # |
| 52 | # Copying and distribution of this file, with or without modification, are |
| 53 | # permitted in any medium without royalty provided the copyright notice |
| 54 | # and this notice are preserved. This file is offered as-is, without any |
| 55 | # warranty. |
| 56 | |
| 57 | #serial 7 |
| 58 | |
| 59 | AC_DEFUN([AX_CHECK_GNU_MAKE], [ AC_CACHE_CHECK( for GNU make,_cv_gnu_make_command, |
| 60 | _cv_gnu_make_command='' ; |
| 61 | dnl Search all the common names for GNU make |
| 62 | for a in "$MAKE" make gmake gnumake ; do |
| 63 | if test -z "$a" ; then continue ; fi ; |
| 64 | if ( sh -c "$a --version" 2> /dev/null | grep GNU 2>&1 > /dev/null ) ; then |
| 65 | _cv_gnu_make_command=$a ; |
| 66 | break; |
| 67 | fi |
| 68 | done ; |
| 69 | ) ; |
| 70 | dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise |
| 71 | if test "x$_cv_gnu_make_command" != "x" ; then |
| 72 | ifGNUmake='' ; |
| 73 | else |
| 74 | ifGNUmake='#' ; |
| 75 | AC_MSG_RESULT("Not found"); |
| 76 | fi |
| 77 | AC_SUBST(ifGNUmake) |
| 78 | ] ) |