acinclude.m4

   1 # from http://autoconf-archive.cryp.to/ax_tls.html
   2 #
   3 # This was licensed under the GPL with the following exception:
   4 #
   5 # As a special exception, the respective Autoconf Macro's copyright
   6 # owner gives unlimited permission to copy, distribute and modify the
   7 # configure scripts that are the output of Autoconf when processing
   8 # the Macro. You need not follow the terms of the GNU General Public
   9 # License when using or distributing such scripts, even though
  10 # portions of the text of the Macro appear in them. The GNU General
  11 # Public License (GPL) does govern all other use of the material that
  12 # constitutes the Autoconf Macro.
  13 #
  14 # This special exception to the GPL applies to versions of the
  15 # Autoconf Macro released by the Autoconf Macro Archive. When you make
  16 # and distribute a modified version of the Autoconf Macro, you may
  17 # extend this special exception to the GPL to apply to your modified
  18 # version as well.
  19 #
  20 AC_DEFUN([AX_TLS], [
  21   AC_MSG_CHECKING(for thread local storage (TLS) class)
  22   AC_CACHE_VAL(ac_cv_tls, [
  23     ax_tls_keywords="__thread __declspec(thread) none"
  24     for ax_tls_keyword in $ax_tls_keywords; do
  25        case $ax_tls_keyword in
  26           none) ac_cv_tls=none ; break ;;
  27           *)
  28              AC_TRY_COMPILE(
  29                 [#include <stdlib.h>
  30                  static void
  31                  foo(void) {
  32                  static ] $ax_tls_keyword [ int bar;
  33                  exit(1);
  34                  }],
  35                  [],
  36                  [ac_cv_tls=$ax_tls_keyword ; break],
  37                  ac_cv_tls=none
  38              )
  39           esac
  40     done
  41 ])
  42
  43   if test "$ac_cv_tls" != "none"; then
  44     dnl AC_DEFINE([TLS], [], [If the compiler supports a TLS storage class define it to that here])
  45     AC_DEFINE_UNQUOTED([TLS], $ac_cv_tls, [If the compiler supports a TLS storage class define it to that here])
  46   fi
  47   AC_MSG_RESULT($ac_cv_tls)
  48 ])
  49
  50 # ===========================================================================
  51 #         http://www.nongnu.org/autoconf-archive/check_gnu_make.html
  52 # ===========================================================================
  53 #
  54 # SYNOPSIS
  55 #
  56 #   CHECK_GNU_MAKE()
  57 #
  58 # DESCRIPTION
  59 #
  60 #   This macro searches for a GNU version of make. If a match is found, the
  61 #   makefile variable `ifGNUmake' is set to the empty string, otherwise it
  62 #   is set to "#". This is useful for including a special features in a
  63 #   Makefile, which cannot be handled by other versions of make. The
  64 #   variable _cv_gnu_make_command is set to the command to invoke GNU make
  65 #   if it exists, the empty string otherwise.
  66 #
  67 #   Here is an example of its use:
  68 #
  69 #   Makefile.in might contain:
  70 #
  71 #       # A failsafe way of putting a dependency rule into a makefile
  72 #       $(DEPEND):
  73 #               $(CC) -MM $(srcdir)/*.c > $(DEPEND)
  74 #
  75 #       @ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND)))
  76 #       @ifGNUmake@ include $(DEPEND)
  77 #       @ifGNUmake@ endif
  78 #
  79 #   Then configure.in would normally contain:
  80 #
  81 #       CHECK_GNU_MAKE()
  82 #       AC_OUTPUT(Makefile)
  83 #
  84 #   Then perhaps to cause gnu make to override any other make, we could do
  85 #   something like this (note that GNU make always looks for GNUmakefile
  86 #   first):
  87 #
  88 #       if  ! test x$_cv_gnu_make_command = x ; then
  89 #               mv Makefile GNUmakefile
  90 #               echo .DEFAULT: > Makefile ;
  91 #               echo \  $_cv_gnu_make_command \$@ >> Makefile;
  92 #       fi
  93 #
  94 #   Then, if any (well almost any) other make is called, and GNU make also
  95 #   exists, then the other make wraps the GNU make.
  96 #
  97 # LICENSE
  98 #
  99 #   Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au>
 100 #
 101 #   Copying and distribution of this file, with or without modification, are
 102 #   permitted in any medium without royalty provided the copyright notice
 103 #   and this notice are preserved.
 104 #
 105 # Note: Modified by Ted Ts'o to add @ifNotGNUMake@
 106
 107 AC_DEFUN(
 108         [CHECK_GNU_MAKE], [ AC_CACHE_CHECK( for GNU make,_cv_gnu_make_command,
 109                 _cv_gnu_make_command='' ;
 110 dnl Search all the common names for GNU make
 111                 if test -n "$FORCE_NATIVE_MAKE" ; then
 112                    MAKES="make"
 113                 else
 114                    MAKES="make gmake gnumake"
 115                 fi
 116                 for a in "$MAKE" $MAKES ; do
 117                         if test -z "$a" ; then continue ; fi ;
 118                         if  ( sh -c "$a --version" 2> /dev/null | grep GNU  2>&1 > /dev/null ) ;  then
 119                                 _cv_gnu_make_command=$a ;
 120                                 break;
 121                         fi
 122                 done ;
 123         ) ;
 124 dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise
 125         if test  "x$_cv_gnu_make_command" != "x"  ; then
 126                 ifGNUmake='' ;
 127                 ifNotGNUmake='#' ;
 128         else
 129                 ifGNUmake='#' ;
 130                 ifNotGNUmake='' ;
 131                 AC_MSG_RESULT("Not found");
 132         fi
 133         AC_SUBST(ifGNUmake)
 134         AC_SUBST(ifNotGNUmake)
 135 ] )