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.

llvm-svn: 172543

1 files changed, 13 insertions, 1 deletions

diff --git a/llvm/configure b/llvm/configure
index 95bf6107e3b..d4687590183 100755
--- a/llvm/configure
+++ b/llvm/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=