* stdbool.m4 (AC_HEADER_STDBOOL): Check that bool

promotes to int, not unsigned int, to catch the AIX 5.3
compiler bug.

diff --git a/m4/ChangeLog b/m4/ChangeLog
index 591a950914946d57d938d71fc6088f56db5fda13..a69f93e1e332213eacc3350eb59d1f3ea2dae297 100644 (file)
--- a/m4/ChangeLog
+++ b/m4/ChangeLog
@@ -1,3 +1,9 @@
+2005-10-06  Paul Eggert  <eggert@cs.ucla.edu>
+
+       * stdbool.m4 (AC_HEADER_STDBOOL): Check that bool
+       promotes to int, not unsigned int, to catch the AIX 5.3
+       compiler bug.
+
 2005-10-06  Simon Josefsson  <jas@extundo.com>
 
        * hmac-md5.m4: New file.

diff --git a/m4/stdbool.m4 b/m4/stdbool.m4
index 3f6b4bfcbf44e62ca8d34aa42aa8c1bf7632679f..945a03653174982483331d2d39aff90b74c02b89 100644 (file)
--- a/m4/stdbool.m4
+++ b/m4/stdbool.m4
@@ -1,6 +1,6 @@
 # Check for stdbool.h that conforms to C99.
 
-dnl Copyright (C) 2002-2004 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2005 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -70,10 +70,11 @@ AC_DEFUN([AC_HEADER_STDBOOL],
          enum { j = false, k = true, l = false * true, m = true * 256 };
          _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];
        ],
        [
          return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !j + !k + !l
-                 + !m + !n + !o);
+                 + !m + !n + !o + !p);
        ],
        [ac_cv_header_stdbool_h=yes],
        [ac_cv_header_stdbool_h=no])])