1 files changed, 66 insertions, 0 deletions
diff --git a/m4/ax_c_pragma.m4 b/m4/ax_c_pragma.m4
new file mode 100644
index 0000000..1848c5e
--- /dev/null
+++ b/m4/ax_c_pragma.m4
@@ -0,0 +1,66 @@
+# ===========================================================================
+#    http://www.gnu.org/software/autoconf-archive/ax_c___attribute__.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_C_PRAGMA(PRAGMA-ID)
+#
+# DESCRIPTION
+#
+#   Provides a test for the compiler support of the
+#   #pragma <PRAGMA-ID> extension.
+#   Defines HAVE_PRAGMA_<PRAGMA-ID> if it is found.
+#
+# LICENSE
+#
+#   Copyright (c) 2011 Andrea Canciani <ranma42@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 2 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 <http://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 1
+
+AC_DEFUN([AX_C_PRAGMA], [
+  AC_CACHE_CHECK([for @%:@pragma $1], [ax_cv_pragma_$1],
+    [AX_NODIFF_COMPILE_IFELSE(
+      [AC_LANG_PROGRAM(
+	[[
+static void foo (void) { return; }
+        ]], [[foo ()]])],
+      [AC_LANG_PROGRAM(
+	[[
+@%:@pragma $1
+static void foo (void) { return; }
+        ]], [[foo ()]])],
+      [ax_cv_pragma_$1=yes],
+      [ax_cv_pragma_$1=no]
+    )
+  ])
+  if test "x$ax_cv_pragma_$1" = "xyes"; then
+    AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_PRAGMA_$1]), 1, [Define to 1 if your compiler has @%:@pragma $1.])
+  fi
+])