1*600f14f4SXin Li# =========================================================================== 2*600f14f4SXin Li# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html 3*600f14f4SXin Li# =========================================================================== 4*600f14f4SXin Li# 5*600f14f4SXin Li# SYNOPSIS 6*600f14f4SXin Li# 7*600f14f4SXin Li# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT]) 8*600f14f4SXin Li# 9*600f14f4SXin Li# DESCRIPTION 10*600f14f4SXin Li# 11*600f14f4SXin Li# Check whether the given FLAG works with the current language's compiler 12*600f14f4SXin Li# or gives an error. (Warnings, however, are ignored) 13*600f14f4SXin Li# 14*600f14f4SXin Li# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on 15*600f14f4SXin Li# success/failure. 16*600f14f4SXin Li# 17*600f14f4SXin Li# If EXTRA-FLAGS is defined, it is added to the current language's default 18*600f14f4SXin Li# flags (e.g. CFLAGS) when the check is done. The check is thus made with 19*600f14f4SXin Li# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to 20*600f14f4SXin Li# force the compiler to issue an error when a bad flag is given. 21*600f14f4SXin Li# 22*600f14f4SXin Li# INPUT gives an alternative input source to AC_COMPILE_IFELSE. 23*600f14f4SXin Li# 24*600f14f4SXin Li# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this 25*600f14f4SXin Li# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG. 26*600f14f4SXin Li# 27*600f14f4SXin Li# LICENSE 28*600f14f4SXin Li# 29*600f14f4SXin Li# Copyright (c) 2008 Guido U. Draheim <[email protected]> 30*600f14f4SXin Li# Copyright (c) 2011 Maarten Bosmans <[email protected]> 31*600f14f4SXin Li# 32*600f14f4SXin Li# Copying and distribution of this file, with or without modification, are 33*600f14f4SXin Li# permitted in any medium without royalty provided the copyright notice 34*600f14f4SXin Li# and this notice are preserved. This file is offered as-is, without any 35*600f14f4SXin Li# warranty. 36*600f14f4SXin Li 37*600f14f4SXin Li#serial 6 38*600f14f4SXin Li 39*600f14f4SXin LiAC_DEFUN([AX_CHECK_COMPILE_FLAG], 40*600f14f4SXin Li[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF 41*600f14f4SXin LiAS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl 42*600f14f4SXin LiAC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ 43*600f14f4SXin Li ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS 44*600f14f4SXin Li _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" 45*600f14f4SXin Li AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], 46*600f14f4SXin Li [AS_VAR_SET(CACHEVAR,[yes])], 47*600f14f4SXin Li [AS_VAR_SET(CACHEVAR,[no])]) 48*600f14f4SXin Li _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags]) 49*600f14f4SXin LiAS_VAR_IF(CACHEVAR,yes, 50*600f14f4SXin Li [m4_default([$2], :)], 51*600f14f4SXin Li [m4_default([$3], :)]) 52*600f14f4SXin LiAS_VAR_POPDEF([CACHEVAR])dnl 53*600f14f4SXin Li])dnl AX_CHECK_COMPILE_FLAGS 54