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Annotation of freem/m4/m4_ax_append_flag.m4, revision 1.1

1.1     ! snw         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