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-rw-r--r--misc/sys/cdefs.h10
1 files changed, 8 insertions, 2 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 01e81ba9f1..711ac1d912 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -321,8 +321,14 @@
    inline semantics, unless -fgnu89-inline is used.  Using __GNUC_STDC_INLINE__
    or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions
    older than 4.3 may define these macros and still not guarantee GNU inlining
-   semantics.  */
-#if !defined __cplusplus || __GNUC_PREREQ (4,3)
+   semantics.
+
+   clang++ identifies itself as gcc-4.2, but has support for GNU inlining
+   semantics, that can be checked fot by using the __GNUC_STDC_INLINE_ and
+   __GNUC_GNU_INLINE__ macro definitions.  */
+#if (!defined __cplusplus || __GNUC_PREREQ (4,3) \
+     || (defined __clang__ && (defined __GNUC_STDC_INLINE__ \
+			       || defined __GNUC_GNU_INLINE__)))
 # if defined __GNUC_STDC_INLINE__ || defined __cplusplus
 #  define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
 #  define __extern_always_inline \