[NFC] Silence warning about ptr-to-func to ptr-to-obj cast in clang-fuzzer/handle-llvm/handle_llvm.cpp.

[a.elovikov]

Summary

I don't have the whole list of GCC binaries available so I determined the exact
version where the warning disappeared via:

https://github.com/gcc-mirror/gcc/blob/gcc-4_9_0-release/gcc/cp/typeck.c#L6863
https://github.com/gcc-mirror/gcc/blob/gcc-4_8_5-release/gcc/cp/typeck.c#L6652

[erichkeane]

clang/tools/clang-fuzzer/handle-llvm/handle_llvm.cpp

152 ↗

(On Diff #158228)

Clang itself defines these as 4.2, so I don't think we want to disable this warning for clang. I think there needs to be a !defined(__clang) &&...

[a.elovikov]

• Address Erich's comment + clang-format.

[erichkeane]

LMK if you need someone to commit this for you.

tools/clang-fuzzer/handle-llvm/handle_llvm.cpp

void CreateAndRunJITFun(const std::string &IR, CodeGenOpt::Level OLvl) {
   std::unique_ptr<ExecutionEngine> EE(builder.create());
   if (!EE)
     ErrorAndExit("Could not create execution engine");
 
   EE->finalizeObject();
   EE->runStaticConstructorsDestructors(false);
 
   typedef void (*func)(int*, int*, int*, int);
-  func f = reinterpret_cast<func>(EE->getPointerToFunction(EntryFunc)); 
+#if defined(__GNUC__) && !defined(__clang) &&                                  \
+    ((__GNUC__ == 4) && (__GNUC_MINOR__ < 9))
+// Silence
+//
+//   warning: ISO C++ forbids casting between pointer-to-function and
+//   pointer-to-object [-Wpedantic]
+//
+// Since C++11 this casting is conditionally supported and GCC versions
+// starting from 4.9.0 don't warn about the cast.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
+#endif
+  func f = reinterpret_cast<func>(EE->getPointerToFunction(EntryFunc));
+#if defined(__GNUC__) && !defined(__clang) &&                                  \
+    ((__GNUC__ == 4) && (__GNUC_MINOR__ < 9))
+#pragma GCC diagnostic pop
+#endif
 
   // Define some dummy arrays to use an input for now
   int a[] = {1};
   int b[] = {1};
   int c[] = {1};
   f(a, b, c, 1);
 
   EE->runStaticConstructorsDestructors(true);