[SCM] GNU Autoconf source repository branch, master, updated. v2.67-24-gbfc4d94

[Eric Blake]

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- Log -----------------------------------------------------------------
commit bfc4d94c7d92e8d463e830e28798ee7aadcfd47e
Author: Eric Blake <address@hidden>
Date:   Mon Aug 23 14:35:48 2010 -0600

    AC_HEADER_STDBOOL: avoid spurious clang failure
    
    * lib/autoconf/headers.m4 (AC_HEADER_STDBOOL): Drop gcc (and by
    extension clang) check in favor of a gnulib test.  Force failure,
    rather than merely testing for a compiler extension.
    * THANKS: Update.
    Reported by Anders Kaseorg.
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog               |    9 +++++++++
 THANKS                  |    1 +
 lib/autoconf/headers.m4 |    8 ++++----
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 6d7bd7f..9b27194 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2010-08-23  Eric Blake  <address@hidden>
+
+       AC_HEADER_STDBOOL: avoid spurious clang failure
+       * lib/autoconf/headers.m4 (AC_HEADER_STDBOOL): Drop gcc (and by
+       extension clang) check in favor of a gnulib test.  Force failure,
+       rather than merely testing for a compiler extension.
+       * THANKS: Update.
+       Reported by Anders Kaseorg.
+
 2010-08-22  Ralf Wildenhues  <address@hidden>
 
        doc: AIX sed dislikes indented comments.
diff --git a/THANKS b/THANKS
index 8f2691e..c79e21e 100644
--- a/THANKS
+++ b/THANKS
@@ -27,6 +27,7 @@ Alfred G. de Wijn           address@hidden
 Alfred M. Szmidt            address@hidden
 Allan Caffee                address@hidden
 Allan Clark                 address@hidden
+Anders Kaseorg              address@hidden
 Andreas Buening             address@hidden
 Andreas Jaeger              address@hidden
 Andreas Schott              address@hidden
diff --git a/lib/autoconf/headers.m4 b/lib/autoconf/headers.m4
index c8d34c0..b97e09a 100644
--- a/lib/autoconf/headers.m4
+++ b/lib/autoconf/headers.m4
@@ -639,7 +639,7 @@ AC_DEFUN([AC_HEADER_STDBOOL],
        _Bool n[m];
        char o[sizeof n == m * sizeof n[0] ? 1 : -1];
        char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
-#      if defined __xlc__ || defined __GNUC__
+#      if defined __xlc__
         /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0
            reported by James Lemley on 2005-10-05; see
            
http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html
@@ -651,12 +651,12 @@ AC_DEFUN([AC_HEADER_STDBOOL],
            Let us hope that IBM fixes the xlc bug, and also adds
            support for this kind of constant expression.  In the
            meantime, this test will reject xlc, which is OK, since
-           our stdbool.h substitute should suffice.  We also test
-           this with GCC, where it should work, to detect more
+           the gnulib stdbool.h substitute should suffice.  Gnulib
+           also tests this case in test-stdbool.c, to detect more
            quickly whether someone messes up the test in the
            future.  */
         char digs[] = "0123456789";
-        int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1);
+        int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : 0);
 #      endif
        /* Catch a bug in an HP-UX C compiler.  See
           http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html


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