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

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit ab3086737c7ac8ab07fdaee7c35bb8f91fa8a5c0
Author: Paul Eggert <***@cs.ucla.edu>
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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