* elfutils does not compile with gcc 12.2.0
@ 2022-08-24 20:51 Nick
2022-08-24 21:01 ` Dmitry V. Levin
0 siblings, 1 reply; 3+ messages in thread
From: Nick @ 2022-08-24 20:51 UTC (permalink / raw)
To: elfutils-devel
I try to compile elfutils on OpenWrt with the newest gcc 12.2.0 version.
However, it fails due to -Werror=use-after-free. A workaround is a patch
that I found on the mailinglist, to disable -Werror
(https://sourceware.org/legacy-ml/elfutils-devel/imported/msg00994.html)
I modified it to apply to newest elfutils version. The error with
elfutils 0.187 and gcc 12.2.0:
In function 'bigger_buffer',
inlined from '__libdw_gunzip' at gzip.c:376:12:
gzip.c:98:9: error: pointer may be used after 'realloc'
[-Werror=use-after-free]
98 | b = realloc (state->buffer, more -= 1024);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
gzip.c:96:13: note: call to 'realloc' here
96 | char *b = realloc (state->buffer, more);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
Can you apply the patch to disable werror? Or is it necessary to use
some "#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wuse-after-free""-statement?
Bests
Nick
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: elfutils does not compile with gcc 12.2.0
2022-08-24 20:51 elfutils does not compile with gcc 12.2.0 Nick
@ 2022-08-24 21:01 ` Dmitry V. Levin
2022-08-25 8:51 ` Nick
0 siblings, 1 reply; 3+ messages in thread
From: Dmitry V. Levin @ 2022-08-24 21:01 UTC (permalink / raw)
To: elfutils-devel
On Wed, Aug 24, 2022 at 10:51:13PM +0200, Nick via Elfutils-devel wrote:
> I try to compile elfutils on OpenWrt with the newest gcc 12.2.0 version.
> However, it fails due to -Werror=use-after-free. A workaround is a patch
> that I found on the mailinglist, to disable -Werror
> (https://sourceware.org/legacy-ml/elfutils-devel/imported/msg00994.html)
> I modified it to apply to newest elfutils version. The error with
> elfutils 0.187 and gcc 12.2.0:
>
> In function 'bigger_buffer',
> inlined from '__libdw_gunzip' at gzip.c:376:12:
> gzip.c:98:9: error: pointer may be used after 'realloc'
> [-Werror=use-after-free]
> 98 | b = realloc (state->buffer, more -= 1024);
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> gzip.c:96:13: note: call to 'realloc' here
> 96 | char *b = realloc (state->buffer, more);
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This warning is definitely wrong, looks like a regression in gcc, please
report this to compiler people, otherwise they will never know they
introduced a bug that needs fixing.
--
ldv
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: elfutils does not compile with gcc 12.2.0
2022-08-24 21:01 ` Dmitry V. Levin
@ 2022-08-25 8:51 ` Nick
0 siblings, 0 replies; 3+ messages in thread
From: Nick @ 2022-08-25 8:51 UTC (permalink / raw)
To: Dmitry V. Levin, elfutils-devel
On 8/24/22 23:01, Dmitry V. Levin wrote:
> On Wed, Aug 24, 2022 at 10:51:13PM +0200, Nick via Elfutils-devel wrote:
>> I try to compile elfutils on OpenWrt with the newest gcc 12.2.0 version.
>> However, it fails due to -Werror=use-after-free. A workaround is a patch
>> that I found on the mailinglist, to disable -Werror
>> (https://sourceware.org/legacy-ml/elfutils-devel/imported/msg00994.html)
>> I modified it to apply to newest elfutils version. The error with
>> elfutils 0.187 and gcc 12.2.0:
>>
>> In function 'bigger_buffer',
>> inlined from '__libdw_gunzip' at gzip.c:376:12:
>> gzip.c:98:9: error: pointer may be used after 'realloc'
>> [-Werror=use-after-free]
>> 98 | b = realloc (state->buffer, more -= 1024);
>> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> gzip.c:96:13: note: call to 'realloc' here
>> 96 | char *b = realloc (state->buffer, more);
>> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> This warning is definitely wrong, looks like a regression in gcc, please
> report this to compiler people, otherwise they will never know they
> introduced a bug that needs fixing.
I think it is not the only failure. I added a comment under this already
existing bug report:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104069#c24
If you look at this comment I am not sure if that is ever fixed:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104069#c20
The write here about using "pragma" statements to suppress the warning.
What about introducing the disabling of werror by a configure flag?
Bests
Nick
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-08-24 20:51 elfutils does not compile with gcc 12.2.0 Nick
2022-08-24 21:01 ` Dmitry V. Levin
2022-08-25 8:51 ` Nick
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