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This patch is for the sake of gnulib. gnulib implements some form of a thread-safe setlocale variant called setlocale_null_r, which is supposed to return the locale strings in a thread-safe manner. This only succeeds if the system's setlocale already handles this thread-safe, otherwise gnulib adds some locking on its own. Newlib's setlocale always writes the global string array holding the LC_ALL value anew on each invocation of setlocale(LC_ALL, NULL). Since that doesn't allow to call setlocale(LC_ALL, NULL) in a thread-safe manner, so locking in gnulib is required. And here's the problem... The lock is decorated as dllexport when building for Cygwin. This collides with the default behaviour of ld to export all symbols. If it finds one decorated symbol, it will only export this symbol to the DLL import lib. Change setlocale so that it writes the global string array holding the LC_ALL value at the time the locale gets changed. On setlocale(LC_ALL, NULL), just return the pointer to the global LC_ALL string array, just as in GLibc. The burden of doing so is negligibly for all targets, but adds thread-safety for gnulib's setlocal_null_r() function, and gnulib can drop the lock entirely when building for Cygwin. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
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