* lib/cdefs.h: Check if defined before using __USE_FORTIFY_LEVEL.
+2018-01-04 Tim Rühsen <tim.ruehsen@gmx.de>
+
+ Fix -Wundef warning in user-included header lib/cdefs.h.
+ * lib/cdefs.h: Check if defined before using __USE_FORTIFY_LEVEL.
+
2018-01-04 Bruno Haible <bruno@clisp.org>
pthread_sigmask: Avoid compilation error on mingw.
#if __GNUC_PREREQ (3,4)
# define __attribute_warn_unused_result__ \
__attribute__ ((__warn_unused_result__))
-# if __USE_FORTIFY_LEVEL > 0
+# if defined __USE_FORTIFY_LEVEL && __USE_FORTIFY_LEVEL > 0
# define __wur __attribute_warn_unused_result__
# endif
#else