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-rwxr-xr-xsrc/google/protobuf/stubs/hash.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/src/google/protobuf/stubs/hash.h b/src/google/protobuf/stubs/hash.h
index 9a6b217a..3ff72535 100755
--- a/src/google/protobuf/stubs/hash.h
+++ b/src/google/protobuf/stubs/hash.h
@@ -41,10 +41,10 @@
#define GOOGLE_PROTOBUF_HAVE_HASH_MAP 1
#define GOOGLE_PROTOBUF_HAVE_HASH_SET 1
-// Use C++11 unordered_{map|set} if available. Otherwise, libc++ always support
-// unordered_{map|set}
-#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X) || \
- defined(_LIBCPP_VERSION)
+// Use C++11 unordered_{map|set} if available.
+#if ((__cplusplus >= 201103L) && \
+ ((defined(__GLIBCXX__) && (__GLIBCXX__ > 20090421)) || \
+ (defined(_LIBCPP_VERSION) && (_LIBCPP_STD_VER >= 11))))
# define GOOGLE_PROTOBUF_HAS_CXX11_HASH
// For XCode >= 4.6: the compiler is clang with libc++.