Re: [Tinycc-devel] Support for sections describing frames.

[Herman ten Brugge]

On 10/7/24 23:16, Max Logaev wrote:
> Hello!
>
> I noticed that with debug options TCC does not generate ".debug_frame" (described by the DWARF 
> standard) or similar extended ".eh_frame" + ".eh _framehdr" 
> (https://refspecs.linuxfoundation.org/LSB_3.0.0/LSB-Core-generic/LSB-Core-generic/ehframechpt.html).
>
> And the second one seems critical. I encountered this problem because of 
> incorrect work of bactrace() from glibc 
> (https://www.gnu.org/software/libc/manual/html_node/Backtraces.html).
>
> The thing is that bactrace() uses unwinding functions from the libgcc library 
> for backtracing. And the libgcc library uses .eh_frame.
>
> I think that this debug information would be useful provided that TCC supports 
> several architectures and unwinding for each architecture may differ.
>
> Also, I do not quite understand how the "-bt" option works. It seems that this 
> is something completely non-standard.
>
> I would like to know if such functionality is needed or is it redundant? I just 
> would like to tackle this task.
I added support for .eh_frame and .eh_framehdr.
backtrace() should now work on most targets.

    Herman