Subzero: Fix g++ warnings.

src/IceGlobalContext.cpp

 //===- subzero/src/IceGlobalContext.cpp - Global context defs -------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// \brief Defines aspects of the compilation that persist across multiple
 /// functions.
 ///
 //===----------------------------------------------------------------------===//
 
 #include "IceGlobalContext.h"
 
 #include "IceCfg.h"
 #include "IceCfgNode.h"
 #include "IceClFlags.h"
 #include "IceDefs.h"
 #include "IceELFObjectWriter.h"
 #include "IceGlobalInits.h"
 #include "IceOperand.h"
 #include "IceTargetLowering.h"
 #include "IceTimerTree.h"
 #include "IceTypes.h"
 
+#ifdef __clang__
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wunused-parameter"
+#endif // __clang__
+
 #include "llvm/Support/Timer.h"
+
+#ifdef __clang__
 #pragma clang diagnostic pop
+#endif // __clang__
 
 #include <algorithm> // max()
 #include <cctype>    // isdigit(), isupper()
 #include <locale>    // locale
 
 namespace std {
 template <> struct hash<Ice::RelocatableTuple> {
   size_t operator()(const Ice::RelocatableTuple &Key) const {
     return hash<Ice::IceString>()(Key.Name) +
            hash<Ice::RelocOffsetT>()(Key.Offset);
@@ skipping 966 matching lines @@
   Ctx = Func->getContext();
   Active =
       Func->getFocusedTiming() || Ctx->getFlags().getSubzeroTimingEnabled();
   if (Active)
     Ctx->pushTimer(ID, StackID);
 }
 
 ICE_TLS_DEFINE_FIELD(GlobalContext::ThreadContext *, GlobalContext, TLS);
 
 } // end of namespace Ice