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-rw-r--r--src/common/thread.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/src/common/thread.h b/src/common/thread.h
index eaf1ba00c..a45728e1e 100644
--- a/src/common/thread.h
+++ b/src/common/thread.h
@@ -24,6 +24,25 @@
#include <unistd.h>
#endif
+// Support for C++11's thread_local keyword was surprisingly spotty in compilers until very
+// recently. Fortunately, thread local variables have been well supported for compilers for a while,
+// but with semantics supporting only POD types, so we can use a few defines to get some amount of
+// backwards compat support.
+// WARNING: This only works correctly with POD types.
+#if defined(__clang__)
+# if !__has_feature(cxx_thread_local)
+# define thread_local __thread
+# endif
+#elif defined(__GNUC__)
+# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
+# define thread_local __thread
+# endif
+#elif defined(_MSC_VER)
+# if _MSC_VER < 1900
+# define thread_local __declspec(thread)
+# endif
+#endif
+
namespace Common
{