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c8b66101ee
Use of thread-local storage on Windows (introduced recently in 69e8d471d1) could cause a -Wattributes warning in mingw-w64 builds, since that toolchain doesn't understand __declspec(thread). Define a portability macro THREADLOCAL, which should resolve to something appropriate for at least: - MSVC, which understands the Microsoft syntax __declspec(thread); - GCC (e.g., mingw-w64) which understands the GNU syntax __thread (GCC only implements __declspec() to the extent of understanding the arguments 'dllexport' and 'dllimport'); - Clang, which supports both syntaxes. (It's possible there's some more obscure Windows toolchain which will now hit the #error as a result of this change.) I haven't attempted to try to detect and use the C11 syntax 'thread_local'. And this is all still Windows-only, since that's all we need for now and it avoids opening the can of worms that is TLS on other platforms. (I considered delegating all this to cmake, but as well as being fiddly, it seems even the latest versions of cmake don't know about thread-local storage for C, as opposed to C++ (cxx_thread_local).)