diff options
Diffstat (limited to 'absl/base/config.h')
| -rw-r--r-- | absl/base/config.h | 43 |
1 files changed, 31 insertions, 12 deletions
diff --git a/absl/base/config.h b/absl/base/config.h index d3cad682..ae7a5a15 100644 --- a/absl/base/config.h +++ b/absl/base/config.h @@ -520,22 +520,41 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' || #error "absl endian detection needs to be set up for your compiler" #endif -// macOS 10.13 and iOS 10.11 don't let you use <any>, <optional>, or <variant> -// even though the headers exist and are publicly noted to work. See -// https://github.com/abseil/abseil-cpp/issues/207 and +// macOS < 10.13 and iOS < 11 don't let you use <any>, <optional>, or <variant> +// even though the headers exist and are publicly noted to work, because the +// libc++ shared library shipped on the system doesn't have the requisite +// exported symbols. See https://github.com/abseil/abseil-cpp/issues/207 and // https://developer.apple.com/documentation/xcode_release_notes/xcode_10_release_notes +// // libc++ spells out the availability requirements in the file // llvm-project/libcxx/include/__config via the #define // _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS. -#if defined(__APPLE__) && defined(_LIBCPP_VERSION) && \ - ((defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ - __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101400) || \ - (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && \ - __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 120000) || \ - (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && \ - __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000) || \ - (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && \ - __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 120000)) +// +// Unfortunately, Apple initially mis-stated the requirements as macOS < 10.14 +// and iOS < 12 in the libc++ headers. This was corrected by +// https://github.com/llvm/llvm-project/commit/7fb40e1569dd66292b647f4501b85517e9247953 +// which subsequently made it into the XCode 12.5 release. We need to match the +// old (incorrect) conditions when built with old XCode, but can use the +// corrected earlier versions with new XCode. +#if defined(__APPLE__) && defined(_LIBCPP_VERSION) && \ + ((_LIBCPP_VERSION >= 11000 && /* XCode 12.5 or later: */ \ + ((defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ + __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101300) || \ + (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && \ + __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 110000) || \ + (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && \ + __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 40000) || \ + (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && \ + __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 110000))) || \ + (_LIBCPP_VERSION < 11000 && /* Pre-XCode 12.5: */ \ + ((defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ + __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101400) || \ + (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && \ + __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 120000) || \ + (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && \ + __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000) || \ + (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && \ + __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 120000)))) #define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 1 #else #define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 0 |