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changeset 6598:717623bb6fd8

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Check against AIX and HP-UX C compiler bugs.
author Bruno Haible <bruno@clisp.org>
date Tue, 24 Jan 2006 22:05:28 +0000
parents 9760557db4e2
children 02995926085d
files m4/ChangeLog m4/stdbool.m4
diffstat 2 files changed, 28 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/m4/ChangeLog
+++ b/m4/ChangeLog
@@ -1,3 +1,8 @@
+2006-01-24  Bruno Haible  <bruno@clisp.org>
+
+	* stdbool.m4 (AC_HEADER_STDBOOL): Check for IBM and HP-UX bugs.
+	Patch by Paul Eggert.
+
 2006-01-24  Jim Meyering  <jim@meyering.net>
 
 	* openat.m4 (gl_FUNC_OPENAT): Add AC_LIBSOURCES([intprops.h]).
--- a/m4/stdbool.m4
+++ b/m4/stdbool.m4
@@ -1,6 +1,6 @@
 # Check for stdbool.h that conforms to C99.
 
-dnl Copyright (C) 2002-2005 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2006 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.
@@ -74,6 +74,28 @@
 	  _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__
+	   /* 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
+	      This test is not quite right, since xlc is allowed to
+	      reject this program, as the initializer for xlcbug is
+	      not one of the forms that C requires support for.
+	      However, doing the test right would require a run-time
+	      test, and that would make cross-compilation harder.
+	      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.  */
+	   char digs[] = "0123456789";
+	   int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1);
+	  #endif
+	  /* Catch a bug in an HP-UX C compiler.  See
+	     http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
+	     http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
+	   */
+	  _Bool q = true;
+	  _Bool *pq = &q;
 	],
 	[
 	  /* Refer to every declared value, to avoid compiler optimizations.  */