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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 |
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