Add kGnuc C++ constant representing __GNUC__

Summary: [Folly] Add `kGnuc` C++ constant representing `__GNUC__` preprocessor constant. Reviewed By: vitaut Differential Revision: D18827910 fbshipit-source-id: 43e07e12017df1e7cf4d6a5747e7a85d8a7616f3

Add kGnuc C++ constant representing GNUC
Summary: [Folly] Add `kGnuc` C++ constant representing `__GNUC__` preprocessor constant. Reviewed By: vitaut Differential Revision: D18827910 fbshipit-source-id: 43e07e12017df1e7cf4d6a5747e7a85d8a7616f3
1d485af8 · Yedidya Feldblum · Facebook Github Bot · f2d5818b · 1d485af8
Commit 1d485af8 authored Dec 05, 2019 by Yedidya Feldblum Committed by Facebook Github Bot Dec 05, 2019
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folly/Portability.h folly/Portability.h +6 -0

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--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -450,6 +450,12 @@ constexpr auto kMscVer = _MSC_VER;
 constexpr auto kMscVer = 0;
 #endif

+#if __GNUC__
+constexpr auto kGnuc = __GNUC__;
+#else
+constexpr auto kGnuc = 0;
+#endif
+
 #if __clang__
 constexpr auto kIsClang = true;
 #else