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* [Bug nptl/17870] New: Build failure on x32
@ 2015-01-23 22:01 hjl.tools at gmail dot com
2015-01-23 22:12 ` [Bug nptl/17870] " carlos at redhat dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: hjl.tools at gmail dot com @ 2015-01-23 22:01 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=17870
Bug ID: 17870
Summary: Build failure on x32
Product: glibc
Version: 2.21
Status: NEW
Severity: normal
Priority: P2
Component: nptl
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
CC: drepper.fsp at gmail dot com
With commit 2ec2d7032ff9220da1577c37d41ae85c0721ad66 on x32, I got
In file included from sem_timedwait.c:20:0:
sem_waitcommon.c: In function ‘__sem_wait_cleanup’:
sem_waitcommon.c:190:3: error: left shift count >= width of type [-Werror]
atomic_fetch_add_relaxed (&sem->data, -(1UL << SEM_NWAITERS_SHIFT));
^
sem_waitcommon.c: In function ‘__new_sem_wait_slow’:
sem_waitcommon.c:266:3: error: left shift count >= width of type [-Werror]
unsigned long d = atomic_fetch_add_relaxed (&sem->data,
^
sem_waitcommon.c:306:8: error: left shift count >= width of type [-Werror]
atomic_fetch_add_relaxed (&sem->data,
^
sem_waitcommon.c:322:4: error: left shift count >= width of type [-Werror]
if (atomic_compare_exchange_weak_acquire (&sem->data,
^
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From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nptl/17870] Build failure on x32
Date: Fri, 23 Jan 2015 22:02:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id\x17870
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
It is caused by
commit 042e1521c794a945edc43b5bfa7e69ad70420524
Author: Carlos O'Donell <carlos@systemhalted.org>
Date: Wed Jan 21 00:46:16 2015 -0500
Fix semaphore destruction (bug 12674).
This commit fixes semaphore destruction by either using 64b atomic
operations (where available), or by using two separate fields when only
32b atomic operations are available. In the latter case, we keep a
conservative estimate of whether there are any waiting threads in one
bit of the field that counts the number of available tokens, thus
allowing sem_post to atomically both add a token and determine whether
it needs to call futex_wake.
See:
https://sourceware.org/ml/libc-alpha/2014-12/msg00155.html
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2015-01-23 22:01 [Bug nptl/17870] New: Build failure on x32 hjl.tools at gmail dot com
2015-01-23 22:12 ` [Bug nptl/17870] " carlos at redhat dot com
2015-01-23 22:51 ` cvs-commit at gcc dot gnu.org
2015-01-23 22:52 ` hjl.tools at gmail dot com
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