extern-inline: provide a -Wundef safe config.h

* m4/extern-inline.m4 (gl_EXTERN_INLINE): Protect
"#if __GNUC_STDC_INLINE__" with "defined __GNUC_STDC_INLINE__"
to produce a -Wundef warning free config.h.

diff --git a/ChangeLog b/ChangeLog
index c419884..2905eef 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2012-09-28  Akim Demaille  <akim@lrde.epita.fr>
+
+       extern-inline: provide a -Wundef safe config.h
+       * m4/extern-inline.m4 (gl_EXTERN_INLINE): Protect
+       "#if __GNUC_STDC_INLINE__" with "defined __GNUC_STDC_INLINE__"
+       to produce a -Wundef warning free config.h.
+
 2012-09-26  Paul Eggert  <eggert@cs.ucla.edu>
 
        hash-pjw: relax license to LGPLv2+

diff --git a/m4/extern-inline.m4 b/m4/extern-inline.m4
index 12f24fa..600c8d3 100644 (file)
--- a/m4/extern-inline.m4
+++ b/m4/extern-inline.m4
@@ -18,7 +18,9 @@ AC_DEFUN([gl_EXTERN_INLINE],
      <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>.
    _GL_INLINE_HEADER_END contains useful stuff to put
      in the same include file, after uses of _GL_INLINE.  */
-#if __GNUC__ ? __GNUC_STDC_INLINE__ : 199901L <= __STDC_VERSION__
+#if (__GNUC__ \
+     ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
+     : 199901L <= __STDC_VERSION__)
 # define _GL_INLINE inline
 # define _GL_EXTERN_INLINE extern inline
 #elif 2 < __GNUC__ + (7 <= __GNUC_MINOR__)
@@ -35,7 +37,7 @@ AC_DEFUN([gl_EXTERN_INLINE],
 #endif
 
 #if 4 < __GNUC__ + (6 <= __GNUC_MINOR__)
-# if __GNUC_STDC_INLINE__
+# if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
 #  define _GL_INLINE_HEADER_CONST_PRAGMA
 # else
 #  define _GL_INLINE_HEADER_CONST_PRAGMA \