ax_append_flag.m4 (1552B)
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 33 AC_DEFUN([AX_APPEND_FLAG], 34 [dnl 35 AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF 36 AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])]) 37 AS_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 ]) 49 AS_VAR_POPDEF([FLAGS])dnl 50 ])dnl AX_APPEND_FLAG