# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_append_flag.html # =========================================================================== # # SYNOPSIS # # AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE]) # # DESCRIPTION # # FLAG is appended to the FLAGS-VARIABLE shell variable, with a space # added in between. # # If FLAGS-VARIABLE is not specified, the current language's flags (e.g. # CFLAGS) is used. FLAGS-VARIABLE is not changed if it already contains # FLAG. If FLAGS-VARIABLE is unset in the shell, it is set to exactly # FLAG. # # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. # # LICENSE # # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com> # # This program is free software: you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by the # Free Software Foundation, either version 3 of the License, or (at your # option) any later version. # # This program is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General # Public License for more details. # # You should have received a copy of the GNU General Public License along # with this program. If not, see <https://www.gnu.org/licenses/>. # # As a special exception, the respective Autoconf Macro's copyright owner # gives unlimited permission to copy, distribute and modify the configure # scripts that are the output of Autoconf when processing the Macro. You # need not follow the terms of the GNU General Public License when using # or distributing such scripts, even though portions of the text of the # Macro appear in them. The GNU General Public License (GPL) does govern # all other use of the material that constitutes the Autoconf Macro. # # This special exception to the GPL applies to versions of the Autoconf # Macro released by the Autoconf Archive. When you make and distribute a # modified version of the Autoconf Macro, you may extend this special # exception to the GPL to apply to your modified version as well. #serial 7 AC_DEFUN([AX_APPEND_FLAG], [dnl AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])]) AS_VAR_SET_IF(FLAGS,[ AS_CASE([" AS_VAR_GET(FLAGS) "], [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])], [ AS_VAR_APPEND(FLAGS,[" $1"]) AC_RUN_LOG([: FLAGS="$FLAGS"]) ]) ], [ AS_VAR_SET(FLAGS,[$1]) AC_RUN_LOG([: FLAGS="$FLAGS"]) ]) AS_VAR_POPDEF([FLAGS])dnl ])dnl AX_APPEND_FLAG