diff options
| author |  Peter Kasting <pkasting@google.com> | 2015-08-27 14:04:04 -0700 |
|---|---|---|
| committer | Peter Kasting <pkasting@google.com> | 2015-08-27 19:52:11 -0700 |
| commit | 5ea84dd335cf19ca3771b3d8c9b2a9b2f4f31031 (patch) | |
| tree | 68a10aa1e90775031ea05b53cffe1dda26f72eed /src/google/protobuf/stubs/hash.h | |
| parent | 47210ccd77c88becb9097d59b7765c2d2b41d68e (diff) | |
Refine check for unordered_{map|set} availability.
It's not enough to check for C++11 language support, as it's possible for
projects to enable C++11 language and library features independently (e.g.
Chromium currently does this). Instead, explicitly check the library version to
see if it is recent enough to include unordered_{map|set}.
Diffstat (limited to 'src/google/protobuf/stubs/hash.h')
| -rwxr-xr-x | src/google/protobuf/stubs/hash.h | 8 |
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++. |