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Re: Behavior change, PLT entries for R_X86_64_PLT32 relocations with undefined symbol

From: Martin McClure <martin dot mcclure at gemtalksystems dot com>
To: "H.J. Lu" <hjl dot tools at gmail dot com>
Cc: Binutils <binutils at sourceware dot org>
Date: Tue, 19 Mar 2019 14:44:04 -0700
Subject: Re: Behavior change, PLT entries for R_X86_64_PLT32 relocations with undefined symbol
References: <6d93d4f6-40af-b73f-5c58-9bb77a55b13d@gemtalksystems.com> <CAMe9rOoypUmK-yS1wxfAEJQ8PBadYBGGVXoqkp1BnGrSQ27hPA@mail.gmail.com>

On 3/18/19 11:30 PM, H.J. Lu wrote:

On Tue, Mar 19, 2019 at 10:08 AM Martin McClure
<martin.mcclure@gemtalksystems.com> wrote:

tl;dr: The linker produced PLT entries for undefined symbols with
R_X86_64_PLT32 relocations up through Ubuntu 16.04; but produces calls
to empty PLT entries in Ubuntu 18.04. Has this usage ever been legal,
and if so how can it be made to work now?

[...]

Since answer is undefined, its behavior is undefined.

Thank you, that is useful information.

Regards,

-Martin

References:
- Behavior change, PLT entries for R_X86_64_PLT32 relocations with undefined symbol
  - From: Martin McClure
- Re: Behavior change, PLT entries for R_X86_64_PLT32 relocations with undefined symbol
  - From: H.J. Lu

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