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Subject: Re: [PATCH 2/2] libc-abis: Define ABSOLUTE ABI [BZ #19818][BZ #23307]
To: "Maciej W. Rozycki" <macro@mips.com>
Cc: libc-alpha@sourceware.org, Alan Modra <amodra@gmail.com>
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From: Florian Weimer <fweimer@redhat.com>
Message-ID: <d6680b9a-2afe-7801-c923-0bdceb736950@redhat.com>
Date: Thu, 28 Jun 2018 13:54:00 -0000
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On 06/28/2018 03:49 PM, Maciej W. Rozycki wrote:
> +  /* Mark that we need support for absolute symbols in the dynamic loader.  */
> +  if (htab != NULL && htab->use_absolute_zero)
> +    i_ehdrp->e_ident[EI_ABIVERSION] = MIPS_LIBC_ABI_ABSOLUTE;
> +
>     _bfd_elf_post_process_headers (abfd, link_info);
>   }
>   
> and then `htab->use_absolute_zero' will be TRUE iff a GOT relocation has
> been calculated to actually refer to a specially-created absolute symbol
> used to address the issue covered by binutils PR ld/21375.
> 
>   The flag will be FALSE if code has been relaxed to avoid referring the
> GOT (by using immediate zero instead), in which case no absolute symbol
> will have been specially created.
> 
>   Does this explanation clear your concern?

Yes, I think this is okay then.

We cannot express this change at the RPM dependency level, but I'm not 
sure how active the Fedora MIPS port is these days, so it probably does 
not matter.

Thanks,
Florian