Fix fibers gdb utils script

[folly.git] / folly / Fingerprint.h

diff --git a/folly/Fingerprint.h b/folly/Fingerprint.h
index c7a20fb7536c9bdbac27f7382c957496988cd324..1294a0d285107ef51ff5887b86975493a5d555ca 100644 (file)
--- a/folly/Fingerprint.h
+++ b/folly/Fingerprint.h
@@ -60,10 +60,27 @@ struct FingerprintTable {
 
 template <int BITS>
 const uint64_t FingerprintTable<BITS>::poly[1 + (BITS - 1) / 64] = {};
-
 template <int BITS>
 const uint64_t FingerprintTable<BITS>::table[8][256][1 + (BITS - 1) / 64] = {};
 
+#ifndef _MSC_VER
+// MSVC 2015 can't handle these extern specialization declarations,
+// but they aren't needed for things to work right, so we just don't
+// declare them in the header for MSVC.
+
+#define FOLLY_DECLARE_FINGERPRINT_TABLES(BITS)                      \
+  template <>                                                       \
+  const uint64_t FingerprintTable<BITS>::poly[1 + (BITS - 1) / 64]; \
+  template <>                                                       \
+  const uint64_t FingerprintTable<BITS>::table[8][256][1 + (BITS - 1) / 64]
+
+FOLLY_DECLARE_FINGERPRINT_TABLES(64);
+FOLLY_DECLARE_FINGERPRINT_TABLES(96);
+FOLLY_DECLARE_FINGERPRINT_TABLES(128);
+
+#undef FOLLY_DECLARE_FINGERPRINT_TABLES
+#endif
+
 } // namespace detail
 
 /**