commit 602f80ec8b966cfad3b61914cbe14ee606cedf6e
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date:   Tue Sep 16 22:16:01 2014 +0530

    Make __extern_always_inline usable on clang++ again
    
    The fix for BZ #17266 (884ddc5081278f488ef8cd49951f41cfdbb480ce)
    removed changes that had gone into cdefs.h to make
    __extern_always_inline usable with clang++.  This patch adds back
    support for clang to detect if GNU inlining semantics are available,
    this time without breaking the gcc use case.  The check put here is
    based on the earlier patch and assertion[1] that checking if
    __GNUC_STDC_INLINE__ or __GNUC_GNU_INLINE__ is defined is sufficient
    to determine that clang++ suports GNU inlining semantics.
    
    Tested with a simple program that builds with __extern_always_inline
    with the patch and fails compilation without it.
    
     #include <stdio.h>
     #include <sys/cdefs.h>
    
    extern void foo_alias (void) __asm ("foo");
    
    __extern_always_inline void
    foo (void)
    {
      puts ("hi oh world!");
      return foo_alias ();
    }
    
    void
    foo_alias (void)
    {
      puts ("hell oh world");
    }
    
    int
    main ()
    {
      foo ();
    }
    
    [1] https://sourceware.org/ml/libc-alpha/2012-12/msg00306.html
    
    	[BZ #17266]
    	* misc/sys/cdefs.h: Define __extern_always_inline for clang
    	4.2 and newer.

diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 01e81ba..711ac1d 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 \