In f924b52 (Windows: add pthread_sigmask() that does nothing,
2016-05-01), we introduced a no-op for Windows. However, this breaks
building Git in Git for Windows' SDK because pthread_sigmask() is
already a no-op there, #define'd in the pthread_signal.h header in
/mingw64/x86_64-w64-mingw32/include/.

Let's guard the definition of pthread_sigmask() in #ifndef...#endif to
make the code compile both with modern MinGW-w64 as well as with the
previously common MinGW headers.

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---

        This patch is obviously based on 'next' (because 'master' does not
        have the referenced commit yet).

Published-As: https://github.com/dscho/git/releases/tag/mingw-sigmask-v1
 compat/win32/pthread.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/compat/win32/pthread.h b/compat/win32/pthread.h
index d336451..8df702c 100644
--- a/compat/win32/pthread.h
+++ b/compat/win32/pthread.h
@@ -104,9 +104,11 @@ static inline void *pthread_getspecific(pthread_key_t key)
        return TlsGetValue(key);
 }
 
+#ifndef pthread_sigmask
 static inline int pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
 {
        return 0;
 }
+#endif
 
 #endif /* PTHREAD_H */
-- 
2.8.2.463.g99156ee
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