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

[Adhemerval Zanella Netto]

On 14/08/23 06:16, Florian Weimer wrote:
> * 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
> 
> Found it, I believe I'm not seeing this because of:
> 
> commit 78ceef25d64efeeb6067d1cb282a00466e637e2a
> Author: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
> Date:   Mon Jul 24 14:22:27 2023 -0300
> 
>     configure: Remove --enable-all-warnings option
>     
>     The option is not activelly tested and has bitrotten, to fix it
>     would require a lot of work and multiple fixes.  A better option
>     would to evaluate each option and enable the warning if it makes
>     sense.
>     Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
> 
> diff --git a/Makeconfig b/Makeconfig
> index 77d7fd14df..c4dd9ea8f2 100644
> --- a/Makeconfig
> +++ b/Makeconfig
> @@ -857,12 +857,7 @@ host-test-program-cmd = $(host-built-program-cmd)
>  endif
>  
>  # Extra flags to pass to GCC.
> -ifeq ($(all-warnings),yes)
> -+gccwarn := -Wall -Wwrite-strings -Wcast-qual -Wbad-function-cast -Wmissing-noreturn -Wmissing-prototypes -Wmissing-declarations -Wcomment -Wcomments -Wtrigraphs -Wsign-compare -Wfloat-equal -Wmultichar
> -else
> -+gccwarn := -Wall -Wwrite-strings
> -endif
> -+gccwarn += -Wundef
> +gccwarn := -Wall -Wwrite-strings -Wundef
>  ifeq ($(enable-werror),yes)
>  +gccwarn += -Werror
>  endif
> 
> It dropped -Wall from glibc's default CFLAGS due to a typo (gccwarn
> instead of +gccwarn).
> 
> Will test a fix with build-many-glibcs.py.

Oops, sorry about that and thanks for fixing this up.