From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 13 Dec 2005 19:41:57 +0000 (+0000)
Subject: (AC_HEADER_STDBOOL): Check for buggy compiler that
X-Git-Tag: v6.0~1137
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=eaebfec990d331f44b527fda650dcf68197a5043;p=thirdparty%2Fcoreutils.git

(AC_HEADER_STDBOOL): Check for buggy compiler that
has _Bool but mishandles _Bool |= _Bool.
---

diff --git a/m4/ChangeLog b/m4/ChangeLog
index 25dad52d11..206ae17789 100644
--- a/m4/ChangeLog
+++ b/m4/ChangeLog
@@ -1,3 +1,8 @@
+2005-12-13  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* stdbool.m4 (AC_HEADER_STDBOOL): Check for buggy compiler that
+	has _Bool but mishandles _Bool |= _Bool.
+
 2005-12-07  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* stat-time.m4 (gl_STAT_TIME): Add check for
diff --git a/m4/stdbool.m4 b/m4/stdbool.m4
index 59d38e0750..86ae312d43 100644
--- a/m4/stdbool.m4
+++ b/m4/stdbool.m4
@@ -83,11 +83,15 @@ AC_DEFUN([AC_HEADER_STDBOOL],
 	   char digs[] = "0123456789";
 	   int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1);
 	  #endif
+	  _Bool q = true;
+	  _Bool *pq = &q;
 	],
 	[
+	  *pq |= q;
+	  *pq |= ! q;
 	  /* Refer to every declared value, to avoid compiler optimizations.  */
 	  return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
-		  + !m + !n + !o + !p);
+		  + !m + !n + !o + !p + !q + !pq);
 	],
 	[ac_cv_header_stdbool_h=yes],
 	[ac_cv_header_stdbool_h=no])])