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Re: [SCM] GNU Autoconf source repository branch, master, updated. v2.67-
From: |
Paul Eggert |
Subject: |
Re: [SCM] GNU Autoconf source repository branch, master, updated. v2.67-26-gd984765 |
Date: |
Tue, 24 Aug 2010 14:41:36 -0700 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.11) Gecko/20100713 Thunderbird/3.0.6 |
On 08/24/2010 02:13 PM, Eric Blake wrote:
> Thanks. Are you planning on syncing this back to gnulib as well?
No, I hadn't thought of that; thanks for reminding me. Here's
what I installed:
>From bde8be8f5dd1105af5fc568680df3e84a35bfec5 Mon Sep 17 00:00:00 2001
From: Paul Eggert <address@hidden>
Date: Tue, 24 Aug 2010 14:36:27 -0700
Subject: [PATCH] stdbool: avoid spurious failure with modern xlc
* m4/stdbool.m4 (AC_HEADER_STDBOOL): Resync with autoconf.
---
ChangeLog | 5 +++++
m4/stdbool.m4 | 24 +++++-------------------
2 files changed, 10 insertions(+), 19 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 660ec9b..fd84791 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-08-24 Paul Eggert <address@hidden>
+
+ stdbool: avoid spurious failure with modern xlc
+ * m4/stdbool.m4 (AC_HEADER_STDBOOL): Resync with autoconf.
+
2010-08-24 Bruno Haible <address@hidden>
getloadavg: simplify code
diff --git a/m4/stdbool.m4 b/m4/stdbool.m4
index fed31d9..4936746 100644
--- a/m4/stdbool.m4
+++ b/m4/stdbool.m4
@@ -35,7 +35,7 @@ AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H])
# This version of the macro is needed in autoconf <= 2.67. Autoconf has
# it built in since 2.60, but we want the tweaks from the 2.68 version
-# to avoid rejecting clang due to relying on extensions.
+# to avoid rejecting xlc and clang due to relying on extensions.
AC_DEFUN([AC_HEADER_STDBOOL],
[AC_CACHE_CHECK([for stdbool.h that conforms to C99],
@@ -68,32 +68,17 @@ AC_DEFUN([AC_HEADER_STDBOOL],
char b[false == 0 ? 1 : -1];
char c[__bool_true_false_are_defined == 1 ? 1 : -1];
char d[(bool) 0.5 == true ? 1 : -1];
- bool e = &s;
+ /* See body of main program for 'e'. */
char f[(_Bool) 0.0 == false ? 1 : -1];
char g[true];
char h[sizeof (_Bool)];
char i[sizeof s.t];
enum { j = false, k = true, l = false * true, m = true * 256 };
+ /* The following fails for
+ HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */
_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];
- #ifdef __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. We also test
- in test-stdbool.c to ensure nothing else messes up. */
- char digs[] = "0123456789";
- 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
http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
@@ -102,6 +87,7 @@ AC_DEFUN([AC_HEADER_STDBOOL],
_Bool *pq = &q;
],
[
+ bool e = &s;
*pq |= q;
*pq |= ! q;
/* Refer to every declared value, to avoid compiler optimizations.
*/
--
1.7.2