[Bug libelf/21315] multiple misaligned address errors for Elf64_Shdr

["ago at gentoo dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21315

--- Comment #2 from Agostino Sarubbo <ago at gentoo dot org> ---
(In reply to Mark Wielaard from comment #1)
> Note that in some cases elfutils deliberately does unaligned accesses if it
> believes it is safe. See the following in lib/eu-config.h:
> 
> /* Define ALLOW_UNALIGNED if the architecture allows operations on
>    unaligned memory locations.  */
> #define SANITIZE_UNDEFINED 1
> #if (defined __i386__ || defined __x86_64__) && ! CHECK_UNDEFINED
> # define ALLOW_UNALIGNED        1
> #else
> # define ALLOW_UNALIGNED        0
> #endif
> 
> Note that it is to not allow unaligned accesses when configuring with
> --enable-sanitize-undefined (which adds -fsanitize=undefined
> -fno-sanitize-recover to CFLAGS and CXXFLAGS).
> 
> Are you configuring using --enable-sanitize-undefined? Or adding
> -fsanitize=undefined by hand? In the later case you should also add
> -DCHECK_UNDEFINED=1

It was added by hand..I need to test if I obtain those warning with
--enable-sanitize-undefined

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