Don't define `_POSIX_THREADS` unless threads are enabled. (#356)

[wasi-libc.git] / libc-top-half / musl / include / unistd.h

diff --git a/libc-top-half/musl/include/unistd.h b/libc-top-half/musl/include/unistd.h
index b5cb5c6630169415c4e155c6d57cc7b943910d16..0be83e368c4c87224fb8a9b39808e3f642c948a9 100644 (file)
--- a/libc-top-half/musl/include/unistd.h
+++ b/libc-top-half/musl/include/unistd.h
@@ -336,7 +336,9 @@ pid_t gettid(void);
 #endif
 #define _POSIX_VDISABLE         0
 
+#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
 #define _POSIX_THREADS          _POSIX_VERSION
+#endif
 #define _POSIX_THREAD_PROCESS_SHARED _POSIX_VERSION
 #define _POSIX_THREAD_SAFE_FUNCTIONS _POSIX_VERSION
 #define _POSIX_THREAD_ATTR_STACKADDR _POSIX_VERSION