From: Joseph Myers <joseph@codesourcery.com>
To: <libc-alpha@sourceware.org>, <gcc@gcc.gnu.org>
Subject: Failures building glibc with mainline GCC
Date: Fri, 30 Jul 2021 15:30:25 +0000 [thread overview]
Message-ID: <alpine.DEB.2.22.394.2107301518250.581212@digraph.polyomino.org.uk> (raw)
There are a lot of failures building glibc with mainline GCC right now
<https://sourceware.org/pipermail/libc-testresults/2021q3/008335.html>
(previously, there were ICEs building glibc on various architectures, so
these might be hard to bisect):
* x86_64-linux-gnu: "error: array subscript 0 is outside array bounds of
'__seg_fs struct pthread * __seg_fs[0]' [-Werror=array-bounds]". This is
the one discussed in
<https://gcc.gnu.org/pipermail/gcc/2021-July/236922.html>.
In file included from ../sysdeps/generic/libc-tsd.h:44,
from ../include/../locale/localeinfo.h:224,
from ../include/ctype.h:26,
from loadmsgcat.c:29:
loadmsgcat.c: In function '_nl_load_domain':
../sysdeps/x86_64/nptl/tls.h:185:4: error: array subscript 0 is outside array bounds of '__seg_fs struct pthread * __seg_fs[0]' [-Werror=array-bounds]
185 | (*(struct pthread *__seg_fs *) offsetof (struct pthread, header.self))
| ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../sysdeps/nptl/libc-lock.h:92:18: note: in expansion of macro 'THREAD_SELF'
92 | void *self = THREAD_SELF; \
| ^~~~~~~~~~~
loadmsgcat.c:770:3: note: in expansion of macro '__libc_lock_lock_recursive'
770 | __libc_lock_lock_recursive (lock);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
* i686-gnu:
hurdselect.c: In function '_hurd_select':
hurdselect.c:555:7: error: 'ss' may be used uninitialized in this function [-Werror=maybe-uninitialized]
555 | _hurd_sigstate_unlock (ss);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
As far as I can tell, this is a false positive from the compiler (this
code is only reached if (sigport != MACH_PORT_NULL), in which case ss has
been initialized).
* Several architectures (all of them 32-bit), powerpc-linux-gnu for
example:
In file included from t.61.c:437:
In function 'from_t_61_single',
inlined from 'gconv' at ../iconv/skeleton.c:568:15:
../iconv/loop.c:440:22: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
440 | bytebuf[inlen++] = *inptr++;
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~
../iconv/loop.c: In function 'gconv':
../iconv/loop.c:382:17: note: at offset 2 into destination object 'bytebuf' of size 2
382 | unsigned char bytebuf[MAX_NEEDED_INPUT];
| ^~~~~~~
I don't know if this is a false positive or not.
* powerpc64-linux-gnu:
In file included from ../sysdeps/powerpc/dl-tls.c:20:
In function '_dl_allocate_tls_init',
inlined from '_dl_allocate_tls' at ../elf/dl-tls.c:621:10:
../elf/dl-tls.c:529:10: error: array subscript -1 is outside array bounds of 'void[9223372036854775807]' [-Werror=array-bounds]
529 | dtv_t *dtv = GET_DTV (result);
| ^~~
In file included from ../elf/dl-tls.c:28,
from ../sysdeps/powerpc/dl-tls.c:20:
../sysdeps/powerpc/nptl/tls.h:136:34: error: array subscript -1 is outside array bounds of 'void[9223372036854775807]' [-Werror=array-bounds]
136 | ((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
../elf/dl-tls.c:544:7: note: in expansion of macro 'INSTALL_DTV'
544 | INSTALL_DTV (result, &dtv[-1]);
| ^~~~~~~~~~~
* powerpc64le-linux-gnu: "error: '-mabi=ibmlongdouble' requires
'-mlong-double-128'". See
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100909>.
--
Joseph S. Myers
joseph@codesourcery.com
next reply other threads:[~2021-07-30 15:30 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-30 15:30 Joseph Myers [this message]
2021-07-30 16:19 ` Failures building glibc with mainline GCC Aldy Hernandez via Libc-alpha
2021-07-30 16:22 ` Jeff Law via Libc-alpha
2021-07-30 16:45 ` Jeff Law via Libc-alpha
2021-07-30 17:28 ` Martin Sebor via Libc-alpha
2021-07-30 20:52 ` Joseph Myers
2021-08-02 20:20 ` Martin Sebor via Libc-alpha
2021-08-03 15:54 ` Joseph Myers
2021-08-03 16:20 ` Martin Sebor via Libc-alpha
2021-08-03 17:21 ` Joseph Myers
2021-08-03 17:39 ` Samuel Thibault via Libc-alpha
2021-08-03 22:33 ` Martin Sebor via Libc-alpha
2021-08-03 20:50 ` Segher Boessenkool
2021-08-03 21:00 ` Joseph Myers
2021-08-03 22:02 ` Segher Boessenkool
2021-08-03 22:59 ` Martin Sebor via Libc-alpha
2021-07-30 16:38 ` Joseph Myers
2021-07-30 16:43 ` Jakub Jelinek via Libc-alpha
2021-07-30 16:53 ` Martin Sebor via Libc-alpha
2021-07-30 17:02 ` Jakub Jelinek via Libc-alpha
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