Disable use of weak in threads_posix.h on Cygwin
Weak doesn't work the same on PE/COFF as on ELF, they are only weak
references. Specifically, since nothing else pulls in the object which
contains pthread_mutexattr_init() (and coming from the C library, that is
the only thing that object contains), means that it ends up as 0
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
diff --git a/include/c11/threads_posix.h b/include/c11/threads_posix.h
index 61b7fab..43e803e 100644
--- a/include/c11/threads_posix.h
+++ b/include/c11/threads_posix.h
@@ -184,7 +184,7 @@
* Thus the linker will be happy and things don't clash when building
* with -O1 or greater.
*/
-#ifdef HAVE_FUNC_ATTRIBUTE_WEAK
+#if defined(HAVE_FUNC_ATTRIBUTE_WEAK) && !defined(__CYGWIN__)
__attribute__((weak))
int pthread_mutexattr_init(pthread_mutexattr_t *attr);