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[Bug ld/28603] Incorrect branch offset from the start of a function afte


From: nickc at redhat dot com
Subject: [Bug ld/28603] Incorrect branch offset from the start of a function after enable LTO
Date: Wed, 15 Dec 2021 12:57:17 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=28603

Nick Clifton <nickc at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |nickc at redhat dot com

--- Comment #3 from Nick Clifton <nickc at redhat dot com> ---
(In reply to Eason Lai from comment #1)
> I have tried to reproduce the issue by creating a simple code for reference,
> but no lucky. If anyone else could give me hint which part of linker may
> causes this problem, I will try deep dive the source code and find I can
> help or not. Thank you.

Is this ARM/AArch64 code that you are talking about ?

If so then the code you will want to look at is in the bfd/ directory,
specifically the elf32-arm.c and/or elfxx-aarch64.c files.  Look for the
functions which are used to resolve relocations.

It is strange that LTO is causing this problem.  I am not sure why this would
cause the effect that you are seeing.  Is it possible that the bad code still
has a relocation associated with it which would put the correct address into
place when the program is loaded ?

Cheers
  Nick

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