added check for compiler support of Wextra-semi

update AX_CHECK_COMPILE_FLAG function call

1 files changed, 51 insertions, 0 deletions

diff --git a/m4/ax_check_compile_flag.m4 b/m4/ax_check_compile_flag.m4
new file mode 100644
index 0000000000..95df39679e
--- /dev/null
+++ b/m4/ax_check_compile_flag.m4
@@ -0,0 +1,51 @@
+ #   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.
+ #   Copying and distribution of this file, with or without modification, are
+ #   permitted in any medium without royalty provided the copyright notice
+ #   and this notice are preserved.  This file is offered as-is, without any
+ #   warranty.
+
+ #serial 5
+ #serial 6
+
+ AC_DEFUN([AX_CHECK_COMPILE_FLAG],
+ [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
+AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
+  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
+  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
+  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
+    [AS_VAR_SET(CACHEVAR,[yes])],
+    [AS_VAR_SET(CACHEVAR,[no])])
+  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
+AS_VAR_IF(CACHEVAR,yes,
+  [m4_default([$2], :)],
+  [m4_default([$3], :)])
+AS_VAR_POPDEF([CACHEVAR])dnl
+])dnl AX_CHECK_COMPILE_FLAGS