tools/missing-macros/src/m4/mfx_cppflags.m4

   1 # serial 1
   2
   3 AC_DEFUN([mfx_PROG_CPPFLAGS], [
   4 AC_MSG_CHECKING([whether the C preprocessor needs special flags])
   5
   6 AC_LANG_CONFTEST([AC_LANG_PROGRAM(
   7 [[#include <limits.h>
   8 #if (32767 >= 4294967295ul) || (65535u >= 4294967295ul)
   9 #  include "your C preprocessor is broken 1"
  10 #elif (0xffffu == 0xfffffffful)
  11 #  include "your C preprocessor is broken 2"
  12 #elif (32767 >= ULONG_MAX) || (65535u >= ULONG_MAX)
  13 #  include "your C preprocessor is broken 3"
  14 #endif
  15 ]], [[ ]]
  16 )])
  17
  18 mfx_save_CPPFLAGS=$CPPFLAGS
  19 mfx_tmp=ERROR
  20 for mfx_arg in "" -no-cpp-precomp
  21 do
  22   CPPFLAGS="$mfx_arg $mfx_save_CPPFLAGS"
  23   _AC_COMPILE_IFELSE([],
  24 [mfx_tmp=$mfx_arg
  25 break])
  26 done
  27 CPPFLAGS=$mfx_save_CPPFLAGS
  28 rm -f conftest.$ac_ext conftest.$ac_objext
  29 case x$mfx_tmp in
  30   x)
  31     AC_MSG_RESULT([none needed]) ;;
  32   xERROR)
  33     AC_MSG_RESULT([ERROR])
  34     AC_MSG_ERROR([your C preprocessor is broken - for details see config.log])
  35     ;;
  36   *)
  37     AC_MSG_RESULT([$mfx_tmp])
  38     CPPFLAGS="$mfx_tmp $CPPFLAGS"
  39     ;;
  40 esac
  41 ])# mfx_PROG_CPPFLAGS