# =========================================================================== # www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html # =========================================================================== # # SYNOPSIS # # AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT]) # # DESCRIPTION # # Check whether the given FLAG works with the current language’s compiler # or gives an error. (Warnings, however, are ignored) # # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on # success/failure. # # If EXTRA-FLAGS is defined, it is added to the current language’s default # flags (e.g. CFLAGS) when the check is done. The check is thus made with # the flags: “CFLAGS EXTRA-FLAGS FLAG”. This can for example be used to # force the compiler to issue an error when a bad flag is given. # # INPUT gives an alternative input source to AC_COMPILE_IFELSE. # # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this # macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG. # # LICENSE # # Copyright © 2008 Guido U. Draheim <guidod@gmx.de> # Copyright © 2011 Maarten Bosmans <mkbosmans@gmail.com> # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty.

serial 11

AC_DEFUN(, [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF AS_VAR_PUSHDEF(,[ax_cv_check_AC_LANG_ABBREV[]flags$4_$1])dnl AC_CACHE_CHECK([whether the _AC_LANG compiler accepts $1], CACHEVAR, [

ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
if test x"m4_case(_AC_LANG,
                   [C], [$GCC],
                   [C++], [$GXX],
                   [Fortran], [$GFC],
                   [Fortran 77], [$G77],
                   [Objective C], [$GOBJC],
                   [Objective C++], [$GOBJCXX],
                   [no])" = xyes ; then
  add_gnu_werror="-Werror"
fi
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1 $add_gnu_werror"
AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
  [AS_VAR_SET(CACHEVAR,[yes])],
  [AS_VAR_SET(CACHEVAR,[no])])
_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])

AS_VAR_IF(CACHEVAR,yes,

[m4_default([$2], :)],
[m4_default([$3], :)])

AS_VAR_POPDEF()dnl ])dnl AX_CHECK_COMPILE_FLAGS