From 0b198ca38f9f58858ad8aa4bf91a2a06a6dee0e5 Mon Sep 17 00:00:00 2001
From: David Greene <greened@obbligato.org>
Date: Tue, 15 Jan 2013 18:21:15 +0000
Subject: Disable Uninitialized Use Warnings for Broken gcc Versions

Some versions of gcc accept unsupported -W flags and run just fine if
there are no warnings, but die with an unsupported flag error if a
warning is encountered.  gcc 4.3 and gcc 4.4 both exhibit this
behavior for -Wno-maybe-uninitialized.  Therefore, if the flag check
for -Wno-maybe-uninitialized succeeds, only use
-Wno-maybe-uninitialized if we are using gcc version 4.7 or greater.
Use -Wno-uninitialized otherwise.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172543 91177308-0d34-0410-b5e6-96231b3b80d8
---
 autoconf/configure.ac | 19 +++++++++++++++++--
 configure             | 14 +++++++++++++-
 2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index c186ed5574..ce360109d2 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -1269,8 +1269,23 @@ then
   then
     CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
   else
-    dnl AC_SUBST doesn't work with empty strings.
-    NO_UNINITIALIZED=
+    dnl Some versions of gcc accept unsupported -W flags if there is
+    dnl no warning but stop with an error when a warning is
+    dnl encountered.  If this gcc is earlier than 4.7, just use
+    dnl -Wno-uninitialized.
+    gxx_version=`$CXX -dumpversion`
+    gxx_version_major=`echo $gxx_version | cut -d'.' -f1`
+    gxx_version_minor=`echo $gxx_version | cut -d'.' -f2`
+    gxx_version_patch=`echo $gxx_version | cut -d'.' -f3`
+
+    if    test "$gxx_version_major" -ge "4" \
+       && test "$gxx_version_minor" -ge "7"; then
+      dnl AC_SUBST doesn't work with empty strings.
+      NO_UNINITIALIZED=
+    else
+      NO_MAYBE_UNINITIALIZED=
+      CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
+    fi
   fi
 else
   NO_UNINITIALIZED=
diff --git a/configure b/configure
index 95bf6107e3..d468759018 100755
--- a/configure
+++ b/configure
@@ -12257,7 +12257,19 @@ then
     NO_UNINITIALIZED=`$CXX -Werror -Wno-uninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-uninitialized`
 
   else
-        NO_UNINITIALIZED=
+                    gxx_version=`$CXX -dumpversion`
+    gxx_version_major=`echo $gxx_version | cut -d'.' -f1`
+    gxx_version_minor=`echo $gxx_version | cut -d'.' -f2`
+    gxx_version_patch=`echo $gxx_version | cut -d'.' -f3`
+
+    if    test "$gxx_version_major" -ge "4" \
+       && test "$gxx_version_minor" -ge "7"; then
+            NO_UNINITIALIZED=
+    else
+      NO_MAYBE_UNINITIALIZED=
+      NO_UNINITIALIZED=`$CXX -Werror -Wno-uninitialized -fsyntax-only -xc /dev/null 2>/dev/null && echo -Wno-uninitialized`
+
+    fi
   fi
 else
   NO_UNINITIALIZED=
-- 
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