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


From: sen2403 at hotmail dot com
Subject: [Bug ld/28603] Incorrect branch offset from the start of a function after enable LTO
Date: Wed, 22 Dec 2021 05:16:42 +0000

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

--- Comment #4 from Eason Lai <sen2403 at hotmail dot com> ---
(In reply to Nick Clifton from comment #3)
> (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

Thanks for reply.
I am using ARM CM4 and no relocation when the program is loaded. 

I have checked the elf32-arm.c, and it is a large file and not easy to figure
out the problem by non-professionals like me. If any professional can help on
this, I will really really appreciate it. Thank you very much.

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