On linux, -nostdlib was causing a --start-group with no --end-group to be passed
to the linker.

llvm-svn: 132629
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 6950770..87358cc 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -3945,10 +3945,10 @@
     CmdArgs.push_back("-lm");
   }
 
-  if (Args.hasArg(options::OPT_static))
-    CmdArgs.push_back("--start-group");
-
   if (!Args.hasArg(options::OPT_nostdlib)) {
+    if (Args.hasArg(options::OPT_static))
+      CmdArgs.push_back("--start-group");
+
     if (!D.CCCIsCXX)
       CmdArgs.push_back("-lgcc");