diff --git a/m4/ax_check_compile_flag.m4 b/m4/ax_check_compile_flag.m4 index 95df39679e..68fd43d5dd 100644 --- a/m4/ax_check_compile_flag.m4 +++ b/m4/ax_check_compile_flag.m4 @@ -1,43 +1,45 @@ - # Copyright (c) 2008 Guido U. Draheim - # Copyright (c) 2011 Maarten Bosmans - # - # This program is free software: you can redistribute it and/or modify it - # under the terms of the GNU General Public License as published by the - # Free Software Foundation, either version 3 of the License, or (at your - # option) any later version. - # - # This program is distributed in the hope that it will be useful, but - # WITHOUT ANY WARRANTY; without even the implied warranty of - # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General - # Public License for more details. - # - # You should have received a copy of the GNU General Public License along - # with this program. If not, see . - # - # As a special exception, the respective Autoconf Macro's copyright owner - # gives unlimited permission to copy, distribute and modify the configure - # scripts that are the output of Autoconf when processing the Macro. You - # need not follow the terms of the GNU General Public License when using - # or distributing such scripts, even though portions of the text of the - # Macro appear in them. The GNU General Public License (GPL) does govern - # all other use of the material that constitutes the Autoconf Macro. - # - # This special exception to the GPL applies to versions of the Autoconf - # Macro released by the Autoconf Archive. When you make and distribute a - # modified version of the Autoconf Macro, you may extend this special - # exception to the GPL to apply to your modified version as well. - # 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. +# =========================================================================== +# https://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 (c) 2008 Guido U. Draheim +# Copyright (c) 2011 Maarten Bosmans +# +# 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 5 - #serial 6 +#serial 7 - AC_DEFUN([AX_CHECK_COMPILE_FLAG], - [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF +AC_DEFUN([AX_CHECK_COMPILE_FLAG], +[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl -AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ +AC_CACHE_CHECK([whether the _AC_LANG compiler accepts $1], CACHEVAR, [ ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],