1# =========================================================================== 2# https://www.gnu.org/software/autoconf-archive/ax_append_flag.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE]) 8# 9# DESCRIPTION 10# 11# FLAG is appended to the FLAGS-VARIABLE shell variable, with a space 12# added in between. 13# 14# If FLAGS-VARIABLE is not specified, the current language's flags (e.g. 15# CFLAGS) is used. FLAGS-VARIABLE is not changed if it already contains 16# FLAG. If FLAGS-VARIABLE is unset in the shell, it is set to exactly 17# FLAG. 18# 19# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. 20# 21# LICENSE 22# 23# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> 24# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com> 25# 26# This program is free software: you can redistribute it and/or modify it 27# under the terms of the GNU General Public License as published by the 28# Free Software Foundation, either version 3 of the License, or (at your 29# option) any later version. 30# 31# This program is distributed in the hope that it will be useful, but 32# WITHOUT ANY WARRANTY; without even the implied warranty of 33# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 34# Public License for more details. 35# 36# You should have received a copy of the GNU General Public License along 37# with this program. If not, see <https://www.gnu.org/licenses/>. 38# 39# As a special exception, the respective Autoconf Macro's copyright owner 40# gives unlimited permission to copy, distribute and modify the configure 41# scripts that are the output of Autoconf when processing the Macro. You 42# need not follow the terms of the GNU General Public License when using 43# or distributing such scripts, even though portions of the text of the 44# Macro appear in them. The GNU General Public License (GPL) does govern 45# all other use of the material that constitutes the Autoconf Macro. 46# 47# This special exception to the GPL applies to versions of the Autoconf 48# Macro released by the Autoconf Archive. When you make and distribute a 49# modified version of the Autoconf Macro, you may extend this special 50# exception to the GPL to apply to your modified version as well. 51 52#serial 7 53 54AC_DEFUN([AX_APPEND_FLAG], 55[dnl 56AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF 57AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])]) 58AS_VAR_SET_IF(FLAGS,[ 59 AS_CASE([" AS_VAR_GET(FLAGS) "], 60 [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])], 61 [ 62 AS_VAR_APPEND(FLAGS,[" $1"]) 63 AC_RUN_LOG([: FLAGS="$FLAGS"]) 64 ]) 65 ], 66 [ 67 AS_VAR_SET(FLAGS,[$1]) 68 AC_RUN_LOG([: FLAGS="$FLAGS"]) 69 ]) 70AS_VAR_POPDEF([FLAGS])dnl 71])dnl AX_APPEND_FLAG 72