[LibFuzzer] Fix `-Wpedantic` warning reported by Eric Christopher.

The warning is reproducible with GCC 4.8. Thanks to David Blaikie for
the suggested fix.

The reported warning was

```
/usr/local/google/home/echristo/sources/llvm/lib/Fuzzer/FuzzerExtFunctions.def:29:10: warning: ISO C++ forbids casting between pointer-to-function and pointer-to-object [-Wpedantic]
 EXT_FUNC(__lsan_enable, void, (), false);
          ^
/usr/local/google/home/echristo/sources/llvm/lib/Fuzzer/FuzzerExtFunctionsWeak.cpp:44:24: note: in definition of macro ‘EXT_FUNC’
   CheckFnPtr((void *)::NAME, #NAME, WARN);
                        ^
```

Differential Revision: https://reviews.llvm.org/D35243

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307686 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Fuzzer/FuzzerExtFunctionsWeak.cpp b/lib/Fuzzer/FuzzerExtFunctionsWeak.cpp
index 7b02b6f..503f039 100644 (file)
--- a/lib/Fuzzer/FuzzerExtFunctionsWeak.cpp
+++ b/lib/Fuzzer/FuzzerExtFunctionsWeak.cpp
@@ -41,7 +41,8 @@ namespace fuzzer {
 ExternalFunctions::ExternalFunctions() {
 #define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN)                            \
   this->NAME = ::NAME;                                                         \
-  CheckFnPtr((void *)::NAME, #NAME, WARN);
+  CheckFnPtr(reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(::NAME)),    \
+             #NAME, WARN);
 
 #include "FuzzerExtFunctions.def"