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

to the linker.

llvm-svn: 132629

clang/lib/Driver/Tools.cpp

@@ -3945,10 +3945,10 @@ void linuxtools::Link::ConstructJob(Compilation &C, const JobAction &JA,
     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");
 

clang/test/Driver/nostdlib.c

@@ -0,0 +1,4 @@
+// RUN: %clang -ccc-host-triple i686-pc-linux-gnu -### -nostdlib %s 2> %t
+// RUN: FileCheck < %t %s
+//
+// CHECK-NOT: start-group