| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 |