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1 | # =========================================================================== |
2 | # https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html | |
3 | # =========================================================================== | |
4 | # | |
5 | # SYNOPSIS | |
6 | # | |
7 | # AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT]) | |
8 | # | |
9 | # DESCRIPTION | |
10 | # | |
11 | # Check whether the given FLAG works with the current language's compiler | |
12 | # or gives an error. (Warnings, however, are ignored) | |
13 | # | |
14 | # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on | |
15 | # success/failure. | |
16 | # | |
17 | # If EXTRA-FLAGS is defined, it is added to the current language's default | |
18 | # flags (e.g. CFLAGS) when the check is done. The check is thus made with | |
19 | # the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to | |
20 | # force the compiler to issue an error when a bad flag is given. | |
21 | # | |
22 | # INPUT gives an alternative input source to AC_COMPILE_IFELSE. | |
23 | # | |
24 | # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this | |
25 | # macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG. | |
26 | # | |
27 | # LICENSE | |
28 | # | |
29 | # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> | |
30 | # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com> | |
31 | # | |
32 | # Copying and distribution of this file, with or without modification, are | |
33 | # permitted in any medium without royalty provided the copyright notice | |
34 | # and this notice are preserved. This file is offered as-is, without any | |
35 | # warranty. | |
36 | ||
37 | #serial 6 | |
38 | ||
39 | AC_DEFUN([AX_CHECK_COMPILE_FLAG], | |
40 | [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF | |
41 | AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl | |
42 | AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ | |
43 | ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS | |
44 | _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" | |
45 | AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], | |
46 | [AS_VAR_SET(CACHEVAR,[yes])], | |
47 | [AS_VAR_SET(CACHEVAR,[no])]) | |
48 | _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags]) | |
49 | AS_VAR_IF(CACHEVAR,yes, | |
50 | [m4_default([$2], :)], | |
51 | [m4_default([$3], :)]) | |
52 | AS_VAR_POPDEF([CACHEVAR])dnl | |
53 | ])dnl AX_CHECK_COMPILE_FLAGS |