1*1fd5a2e1SPrashanth Swaminathan# =========================================================================== 2*1fd5a2e1SPrashanth Swaminathan# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html 3*1fd5a2e1SPrashanth Swaminathan# =========================================================================== 4*1fd5a2e1SPrashanth Swaminathan# 5*1fd5a2e1SPrashanth Swaminathan# SYNOPSIS 6*1fd5a2e1SPrashanth Swaminathan# 7*1fd5a2e1SPrashanth Swaminathan# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT]) 8*1fd5a2e1SPrashanth Swaminathan# 9*1fd5a2e1SPrashanth Swaminathan# DESCRIPTION 10*1fd5a2e1SPrashanth Swaminathan# 11*1fd5a2e1SPrashanth Swaminathan# Check whether the given FLAG works with the current language's compiler 12*1fd5a2e1SPrashanth Swaminathan# or gives an error. (Warnings, however, are ignored) 13*1fd5a2e1SPrashanth Swaminathan# 14*1fd5a2e1SPrashanth Swaminathan# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on 15*1fd5a2e1SPrashanth Swaminathan# success/failure. 16*1fd5a2e1SPrashanth Swaminathan# 17*1fd5a2e1SPrashanth Swaminathan# If EXTRA-FLAGS is defined, it is added to the current language's default 18*1fd5a2e1SPrashanth Swaminathan# flags (e.g. CFLAGS) when the check is done. The check is thus made with 19*1fd5a2e1SPrashanth Swaminathan# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to 20*1fd5a2e1SPrashanth Swaminathan# force the compiler to issue an error when a bad flag is given. 21*1fd5a2e1SPrashanth Swaminathan# 22*1fd5a2e1SPrashanth Swaminathan# INPUT gives an alternative input source to AC_COMPILE_IFELSE. 23*1fd5a2e1SPrashanth Swaminathan# 24*1fd5a2e1SPrashanth Swaminathan# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this 25*1fd5a2e1SPrashanth Swaminathan# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG. 26*1fd5a2e1SPrashanth Swaminathan# 27*1fd5a2e1SPrashanth Swaminathan# LICENSE 28*1fd5a2e1SPrashanth Swaminathan# 29*1fd5a2e1SPrashanth Swaminathan# Copyright (c) 2008 Guido U. Draheim <[email protected]> 30*1fd5a2e1SPrashanth Swaminathan# Copyright (c) 2011 Maarten Bosmans <[email protected]> 31*1fd5a2e1SPrashanth Swaminathan# 32*1fd5a2e1SPrashanth Swaminathan# Copying and distribution of this file, with or without modification, are 33*1fd5a2e1SPrashanth Swaminathan# permitted in any medium without royalty provided the copyright notice 34*1fd5a2e1SPrashanth Swaminathan# and this notice are preserved. This file is offered as-is, without any 35*1fd5a2e1SPrashanth Swaminathan# warranty. 36*1fd5a2e1SPrashanth Swaminathan 37*1fd5a2e1SPrashanth Swaminathan#serial 6 38*1fd5a2e1SPrashanth Swaminathan 39*1fd5a2e1SPrashanth SwaminathanAC_DEFUN([AX_CHECK_COMPILE_FLAG], 40*1fd5a2e1SPrashanth Swaminathan[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF 41*1fd5a2e1SPrashanth SwaminathanAS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl 42*1fd5a2e1SPrashanth SwaminathanAC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ 43*1fd5a2e1SPrashanth Swaminathan ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS 44*1fd5a2e1SPrashanth Swaminathan _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" 45*1fd5a2e1SPrashanth Swaminathan AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], 46*1fd5a2e1SPrashanth Swaminathan [AS_VAR_SET(CACHEVAR,[yes])], 47*1fd5a2e1SPrashanth Swaminathan [AS_VAR_SET(CACHEVAR,[no])]) 48*1fd5a2e1SPrashanth Swaminathan _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags]) 49*1fd5a2e1SPrashanth SwaminathanAS_VAR_IF(CACHEVAR,yes, 50*1fd5a2e1SPrashanth Swaminathan [m4_default([$2], :)], 51*1fd5a2e1SPrashanth Swaminathan [m4_default([$3], :)]) 52*1fd5a2e1SPrashanth SwaminathanAS_VAR_POPDEF([CACHEVAR])dnl 53*1fd5a2e1SPrashanth Swaminathan])dnl AX_CHECK_COMPILE_FLAGS 54