m4/features.m4

   1 #  Copyright (c) 2015 Lucas De Marchi <lucas.de.marchi@gmail.com>
   2 #
   3 #  This program is free software: you can redistribute it and/or modify it
   4 #  under the terms of the GNU General Public License as published by the
   5 #  Free Software Foundation, either version 2 of the License, or (at your
   6 #  option) any later version.
   7 #
   8 #  This program is distributed in the hope that it will be useful, but
   9 #  WITHOUT ANY WARRANTY; without even the implied warranty of
  10 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  11 #  Public License for more details.
  12 #
  13 #  You should have received a copy of the GNU General Public License along
  14 #  with this program. If not, see <http://www.gnu.org/licenses/>.
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  16 #  As a special exception, the respective Autoconf Macro's copyright owner
  17 #  gives unlimited permission to copy, distribute and modify the configure
  18 #  scripts that are the output of Autoconf when processing the Macro. You
  19 #  need not follow the terms of the GNU General Public License when using
  20 #  or distributing such scripts, even though portions of the text of the
  21 #  Macro appear in them. The GNU General Public License (GPL) does govern
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  24 #  This special exception to the GPL applies to versions of the Autoconf
  25 #  Macro released by the Autoconf Archive. When you make and distribute a
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  27 #  exception to the GPL to apply to your modified version as well.
  28 #
  29 # CC_FEATURE_APPEND([FLAGS], [ENV-TO-CHECK], [FLAG-NAME])
  30 AC_DEFUN([CC_FEATURE_APPEND], [
  31   AS_VAR_PUSHDEF([FLAGS], [$1])dnl
  32   AS_VAR_PUSHDEF([ENV_CHECK], [$2])dnl
  33   AS_VAR_PUSHDEF([FLAG_NAME], [$3])dnl
  34
  35   AS_CASE([" AS_VAR_GET(FLAGS) " ],
  36           [*" FLAG_NAME "*], [AC_RUN_LOG([: FLAGS already contains FLAG_NAME])],
  37           [
  38             AS_IF([test "x$FLAGS" != "x"], [AS_VAR_APPEND(FLAGS, " ")])
  39             AS_IF([test "x$ENV_CHECK" = "xyes"],
  40                   [AS_VAR_APPEND(FLAGS, "+FLAG_NAME")],
  41                   [AS_VAR_APPEND(FLAGS, "-FLAG_NAME")])
  42           ]
  43   )
  44
  45   AS_VAR_POPDEF([FLAG_NAME])dnl
  46   AS_VAR_POPDEF([ENV_CHECK])dnl
  47   AS_VAR_POPDEF([FLAGS])dnl
  48 ])