Use Gnulib ACL implementation, for benefit of Solaris etc.

[bpt/emacs.git] / m4 / extern-inline.m4

diff --git a/m4/extern-inline.m4 b/m4/extern-inline.m4
index 5880d4f..94b46dd 100644 (file)
--- a/m4/extern-inline.m4
+++ b/m4/extern-inline.m4
@@ -18,13 +18,24 @@ AC_DEFUN([gl_EXTERN_INLINE],
    _GL_INLINE_HEADER_END contains useful stuff to put
      in the same include file, after uses of _GL_INLINE.
 
-   Suppress the use of extern inline on Apple's platforms,
-   as Libc-825.25 (2012-09-19) is incompatible with it; see
+   Suppress extern inline with HP-UX cc, as it appears to be broken; see
+   <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>.
+
+   Suppress extern inline with Sun C in standards-conformance mode, as it
+   mishandles inline functions that call each other.  E.g., for 'inline void f
+   (void) { } inline void g (void) { f (); }', c99 incorrectly complains
+   'reference to static identifier "f" in extern inline function'.
+   This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16.
+
+   Suppress the use of extern inline on Apple's platforms, as Libc at least
+   through Libc-825.26 (2013-04-09) is incompatible with it; see, e.g.,
    <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>.
    Perhaps Apple will fix this some day.  */
 #if ((__GNUC__ \
       ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
-      : 199901L <= __STDC_VERSION__) \
+      : (199901L <= __STDC_VERSION__ \
+         && !defined __HP_cc \
+         && !(defined __SUNPRO_C && __STDC__))) \
      && !defined __APPLE__)
 # define _GL_INLINE inline
 # define _GL_EXTERN_INLINE extern inline