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# Copying and distribution of this file, with or without modification, are 27# permitted in any medium without royalty provided the copyright notice 28# and this notice are preserved. This file is offered as-is, without any 29# warranty. 30 31#serial 8 32 33AC_DEFUN([AX_APPEND_FLAG], 34[dnl 35AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF 36AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])]) 37AS_VAR_SET_IF(FLAGS,[ 38 AS_CASE([" AS_VAR_GET(FLAGS) "], 39 [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])], 40 [ 41 AS_VAR_APPEND(FLAGS,[" $1"]) 42 AC_RUN_LOG([: FLAGS="$FLAGS"]) 43 ]) 44 ], 45 [ 46 AS_VAR_SET(FLAGS,[$1]) 47 AC_RUN_LOG([: FLAGS="$FLAGS"]) 48 ]) 49AS_VAR_POPDEF([FLAGS])dnl 50])dnl AX_APPEND_FLAG 51