1*1b481fc3SMaciej Żenczykowski# =========================================================================== 2*1b481fc3SMaciej Żenczykowski# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html 3*1b481fc3SMaciej Żenczykowski# =========================================================================== 4*1b481fc3SMaciej Żenczykowski# 5*1b481fc3SMaciej Żenczykowski# SYNOPSIS 6*1b481fc3SMaciej Żenczykowski# 7*1b481fc3SMaciej Żenczykowski# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT]) 8*1b481fc3SMaciej Żenczykowski# 9*1b481fc3SMaciej Żenczykowski# DESCRIPTION 10*1b481fc3SMaciej Żenczykowski# 11*1b481fc3SMaciej Żenczykowski# Check whether the given FLAG works with the current language's compiler 12*1b481fc3SMaciej Żenczykowski# or gives an error. (Warnings, however, are ignored) 13*1b481fc3SMaciej Żenczykowski# 14*1b481fc3SMaciej Żenczykowski# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on 15*1b481fc3SMaciej Żenczykowski# success/failure. 16*1b481fc3SMaciej Żenczykowski# 17*1b481fc3SMaciej Żenczykowski# If EXTRA-FLAGS is defined, it is added to the current language's default 18*1b481fc3SMaciej Żenczykowski# flags (e.g. CFLAGS) when the check is done. The check is thus made with 19*1b481fc3SMaciej Żenczykowski# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to 20*1b481fc3SMaciej Żenczykowski# force the compiler to issue an error when a bad flag is given. 21*1b481fc3SMaciej Żenczykowski# 22*1b481fc3SMaciej Żenczykowski# INPUT gives an alternative input source to AC_COMPILE_IFELSE. 23*1b481fc3SMaciej Żenczykowski# 24*1b481fc3SMaciej Żenczykowski# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this 25*1b481fc3SMaciej Żenczykowski# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG. 26*1b481fc3SMaciej Żenczykowski# 27*1b481fc3SMaciej Żenczykowski# LICENSE 28*1b481fc3SMaciej Żenczykowski# 29*1b481fc3SMaciej Żenczykowski# Copyright (c) 2008 Guido U. Draheim <[email protected]> 30*1b481fc3SMaciej Żenczykowski# Copyright (c) 2011 Maarten Bosmans <[email protected]> 31*1b481fc3SMaciej Żenczykowski# 32*1b481fc3SMaciej Żenczykowski# This program is free software: you can redistribute it and/or modify it 33*1b481fc3SMaciej Żenczykowski# under the terms of the GNU General Public License as published by the 34*1b481fc3SMaciej Żenczykowski# Free Software Foundation, either version 3 of the License, or (at your 35*1b481fc3SMaciej Żenczykowski# option) any later version. 36*1b481fc3SMaciej Żenczykowski# 37*1b481fc3SMaciej Żenczykowski# This program is distributed in the hope that it will be useful, but 38*1b481fc3SMaciej Żenczykowski# WITHOUT ANY WARRANTY; without even the implied warranty of 39*1b481fc3SMaciej Żenczykowski# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 40*1b481fc3SMaciej Żenczykowski# Public License for more details. 41*1b481fc3SMaciej Żenczykowski# 42*1b481fc3SMaciej Żenczykowski# You should have received a copy of the GNU General Public License along 43*1b481fc3SMaciej Żenczykowski# with this program. If not, see <https://www.gnu.org/licenses/>. 44*1b481fc3SMaciej Żenczykowski# 45*1b481fc3SMaciej Żenczykowski# As a special exception, the respective Autoconf Macro's copyright owner 46*1b481fc3SMaciej Żenczykowski# gives unlimited permission to copy, distribute and modify the configure 47*1b481fc3SMaciej Żenczykowski# scripts that are the output of Autoconf when processing the Macro. You 48*1b481fc3SMaciej Żenczykowski# need not follow the terms of the GNU General Public License when using 49*1b481fc3SMaciej Żenczykowski# or distributing such scripts, even though portions of the text of the 50*1b481fc3SMaciej Żenczykowski# Macro appear in them. The GNU General Public License (GPL) does govern 51*1b481fc3SMaciej Żenczykowski# all other use of the material that constitutes the Autoconf Macro. 52*1b481fc3SMaciej Żenczykowski# 53*1b481fc3SMaciej Żenczykowski# This special exception to the GPL applies to versions of the Autoconf 54*1b481fc3SMaciej Żenczykowski# Macro released by the Autoconf Archive. When you make and distribute a 55*1b481fc3SMaciej Żenczykowski# modified version of the Autoconf Macro, you may extend this special 56*1b481fc3SMaciej Żenczykowski# exception to the GPL to apply to your modified version as well. 57*1b481fc3SMaciej Żenczykowski 58*1b481fc3SMaciej Żenczykowski#serial 5 59*1b481fc3SMaciej Żenczykowski 60*1b481fc3SMaciej ŻenczykowskiAC_DEFUN([AX_CHECK_COMPILE_FLAG], 61*1b481fc3SMaciej Żenczykowski[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF 62*1b481fc3SMaciej ŻenczykowskiAS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl 63*1b481fc3SMaciej ŻenczykowskiAC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ 64*1b481fc3SMaciej Żenczykowski ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS 65*1b481fc3SMaciej Żenczykowski _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" 66*1b481fc3SMaciej Żenczykowski AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], 67*1b481fc3SMaciej Żenczykowski [AS_VAR_SET(CACHEVAR,[yes])], 68*1b481fc3SMaciej Żenczykowski [AS_VAR_SET(CACHEVAR,[no])]) 69*1b481fc3SMaciej Żenczykowski _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags]) 70*1b481fc3SMaciej ŻenczykowskiAS_VAR_IF(CACHEVAR,yes, 71*1b481fc3SMaciej Żenczykowski [m4_default([$2], :)], 72*1b481fc3SMaciej Żenczykowski [m4_default([$3], :)]) 73*1b481fc3SMaciej ŻenczykowskiAS_VAR_POPDEF([CACHEVAR])dnl 74*1b481fc3SMaciej Żenczykowski])dnl AX_CHECK_COMPILE_FLAGS 75