1# SPDX-License-Identifier: FSFAP 2# 3# =========================================================================== 4# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html 5# =========================================================================== 6# 7# SYNOPSIS 8# 9# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT]) 10# 11# DESCRIPTION 12# 13# Check whether the given FLAG works with the current language's compiler 14# or gives an error. (Warnings, however, are ignored) 15# 16# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on 17# success/failure. 18# 19# If EXTRA-FLAGS is defined, it is added to the current language's default 20# flags (e.g. CFLAGS) when the check is done. The check is thus made with 21# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to 22# force the compiler to issue an error when a bad flag is given. 23# 24# INPUT gives an alternative input source to AC_COMPILE_IFELSE. 25# 26# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this 27# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG. 28# 29# LICENSE 30# 31# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> 32# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com> 33# 34# Copying and distribution of this file, with or without modification, are 35# permitted in any medium without royalty provided the copyright notice 36# and this notice are preserved. This file is offered as-is, without any 37# warranty. 38 39#serial 6 40 41AC_DEFUN([AX_CHECK_COMPILE_FLAG], 42[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF 43AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl 44AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ 45 ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS 46 _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" 47 AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], 48 [AS_VAR_SET(CACHEVAR,[yes])], 49 [AS_VAR_SET(CACHEVAR,[no])]) 50 _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags]) 51AS_VAR_IF(CACHEVAR,yes, 52 [m4_default([$2], :)], 53 [m4_default([$3], :)]) 54AS_VAR_POPDEF([CACHEVAR])dnl 55])dnl AX_CHECK_COMPILE_FLAGS 56