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Diffstat (limited to 'libbutl/ft/lang.hxx')
| -rw-r--r-- | libbutl/ft/lang.hxx | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/libbutl/ft/lang.hxx b/libbutl/ft/lang.hxx new file mode 100644 index 0000000..5daf9c9 --- /dev/null +++ b/libbutl/ft/lang.hxx @@ -0,0 +1,29 @@ +// file : libbutl/ft/lang.hxx -*- C++ -*- +// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd +// license : MIT; see accompanying LICENSE file + +#ifndef LIBBUTL_FT_LANG_HXX +#define LIBBUTL_FT_LANG_HXX + +// __cpp_thread_local (extension) +// +// If this macro is undefined then one may choose to fallback to __thread. +// Note, however, that it only for values that do not require dynamic +// (runtime) initialization. +// +#ifndef __cpp_thread_local + // + // Apparently Apple's Clang "temporarily disabled" C++11 thread_local until + // they can implement a "fast" version, which reportedly happened in XCode + // 8. + // +# if defined(__apple_build_version__) +# if __apple_build_version__ >= 8000000 +# define __cpp_thread_local 201103 +# endif +# else +# define __cpp_thread_local 201103 +# endif +#endif + +#endif // LIBBUTL_FT_LANG_HXX |