[PATCH] D51869: NFC: bit.h don't warn on strict aliasing for GCC <= 7.1

[JF Bastien via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL341853: NFC: bit.h don't warn on strict aliasing for GCC <= 7.1 (authored by jfb, committed by ).

Repository:
  rL LLVM

https://reviews.llvm.org/D51869

Files:
  llvm/trunk/include/llvm/ADT/bit.h


Index: llvm/trunk/include/llvm/ADT/bit.h
===================================================================
--- llvm/trunk/include/llvm/ADT/bit.h
+++ llvm/trunk/include/llvm/ADT/bit.h
@@ -26,7 +26,15 @@
 inline To bit_cast(const From &from) noexcept {
   alignas(To) unsigned char storage[sizeof(To)];
   std::memcpy(&storage, &from, sizeof(To));
+#if defined(__GNUC__)
+  // Before GCC 7.2, GCC thought that this violated strict aliasing.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif
   return reinterpret_cast<To &>(storage);
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
 }
 
 } // namespace llvm


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