Re: [PATCH] malloc: Remove bin scanning from memalign (bug 30723)

[Florian Weimer <fw@deneb.enyo.de>]

* Florian Weimer:

> * Andreas Schwab:
>
>> malloc.c: In function '_int_free':
>> malloc.c:4496:13: error: unused variable 'fwd' [-Werror=unused-variable]
>>  4496 |   mchunkptr fwd;               /* misc temp for linking */
>>       |             ^~~
>> malloc.c:4495:13: error: unused variable 'bck' [-Werror=unused-variable]
>>  4495 |   mchunkptr bck;               /* misc temp for linking */
>>       |             ^~~
>> malloc.c:4494:19: error: unused variable 'prevsize' [-Werror=unused-variable]
>>  4494 |   INTERNAL_SIZE_T prevsize;    /* size of previous contiguous chunk */
>>       |                   ^~~~~~~~
>> malloc.c:4493:7: error: unused variable 'nextinuse' [-Werror=unused-variable]
>>  4493 |   int nextinuse;               /* true if nextchunk is used */
>>       |       ^~~~~~~~~
>> malloc.c:4492:19: error: unused variable 'nextsize' [-Werror=unused-variable]
>>  4492 |   INTERNAL_SIZE_T nextsize;    /* its size */
>>       |                   ^~~~~~~~
>> malloc.c:4491:13: error: unused variable 'nextchunk' [-Werror=unused-variable]
>>  4491 |   mchunkptr nextchunk;         /* next contiguous chunk */
>>       |             ^~~~~~~~~
>> cc1: all warnings being treated as errors
>> make[2]: *** [../o-iterator.mk:9: /home/abuild/rpmbuild/BUILD/glibc-2.38.9000.31.g084fb31bc2/cc-base/malloc/malloc.o] Error 1
>
> This is a disable-tcache configuration, right? Will fix.

No, the variables are always unused.  This looks like a GCC bug on my
side.  It's strange that it appears with GCC 12 and GCC 13.  Which
version do you use?