From 8039e03777b9db1d90fecfaf413945c45560b727 Mon Sep 17 00:00:00 2001
From: Julien Lerouge <jlerouge@apple.com>
Date: Mon, 26 Oct 2009 19:58:44 +0000
Subject: Add an autoconf test to check for optional compiler flags like
 -Wno-missing-field-initializers or -Wno-variadic-macros.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85147 91177308-0d34-0410-b5e6-96231b3b80d8
---
 autoconf/configure.ac         | 6 ++++++
 autoconf/m4/cxx_flag_check.m4 | 2 ++
 2 files changed, 8 insertions(+)
 create mode 100644 autoconf/m4/cxx_flag_check.m4

(limited to 'autoconf')

diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index b9ad6bb494..794326dd85 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -943,6 +943,12 @@ fi
 dnl Tool compatibility is okay if we make it here.
 AC_MSG_RESULT([ok])
 
+dnl Check optional compiler flags. 
+AC_MSG_CHECKING([optional compiler flags])
+CXX_FLAG_CHECK(NO_VARIADIC_MACROS, [-Wno-variadic-macros])
+CXX_FLAG_CHECK(NO_MISSING_FIELD_INITIALIZERS, [-Wno-missing-field-initializers])
+AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS])
+
 dnl===-----------------------------------------------------------------------===
 dnl===
 dnl=== SECTION 5: Check for libraries
diff --git a/autoconf/m4/cxx_flag_check.m4 b/autoconf/m4/cxx_flag_check.m4
new file mode 100644
index 0000000000..ab09f2af5c
--- /dev/null
+++ b/autoconf/m4/cxx_flag_check.m4
@@ -0,0 +1,2 @@
+AC_DEFUN([CXX_FLAG_CHECK],
+  [AC_SUBST($1, `$CXX $2 -fsyntax-only -xc /dev/null 2>/dev/null && echo $2`)])
-- 
cgit v1.2.3-18-g5258