[SCM] GNU Autoconf source repository branch, master, updated. v2.69-161-gab30867

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit ab3086737c7ac8ab07fdaee7c35bb8f91fa8a5c0
Author: Paul Eggert <address@hidden>
Date:   Tue May 31 08:57:20 2016 -0700

    Port AC_CHECK_HEADER_STDBOOL to C++11
    
    * lib/autoconf/headers.m4: Port to C++11.
    Problem reported by David Seifert in:
    http://lists.gnu.org/archive/html/bug-gnulib/2016-05/msg00052.html

-----------------------------------------------------------------------

Summary of changes:
 lib/autoconf/headers.m4 |   32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/lib/autoconf/headers.m4 b/lib/autoconf/headers.m4
index bb532e5..0c44973 100644
--- a/lib/autoconf/headers.m4
+++ b/lib/autoconf/headers.m4
@@ -529,21 +529,25 @@ AC_DEFUN([AC_CHECK_HEADER_STDBOOL],
         [AC_LANG_PROGRAM(
            [[
              #include <stdbool.h>
-             #ifndef bool
-              "error: bool is not defined"
-             #endif
-             #ifndef false
-              "error: false is not defined"
-             #endif
-             #if false
-              "error: false is not 0"
-             #endif
-             #ifndef true
-              "error: true is not defined"
-             #endif
-             #if true != 1
-              "error: true is not 1"
+
+             #if __cplusplus < 201103
+              #ifndef bool
+               "error: bool is not defined"
+              #endif
+              #ifndef false
+               "error: false is not defined"
+              #endif
+              #if false
+               "error: false is not 0"
+              #endif
+              #ifndef true
+               "error: true is not defined"
+              #endif
+              #if true != 1
+               "error: true is not 1"
+              #endif
              #endif
+
              #ifndef __bool_true_false_are_defined
               "error: __bool_true_false_are_defined is not defined"
              #endif


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