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// file : libbutl/ft/lang.hxx -*- C++ -*-
// 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 works for values that do not require dynamic
// (runtime) initialization.
//
// Note that thread_local with dynamic allocation/destruction appears to be
// broken when we use our own implementation of C++14 threads on MinGW. So
// we restrict ourselves to __thread which appears to be functioning, at
// least in the POSIX threads GCC configuration.
//
#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
# elif !defined(LIBBUTL_MINGW_STDTHREAD)
# define __cpp_thread_local 201103
# endif
#endif
#endif // LIBBUTL_FT_LANG_HXX
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