Re: lto: from insert_attributes to file_end?

On Tue, May 5, 2026 at 5:41 PM Georg-Johann Lay via Gcc <[email protected]> wrote:
>
> In the avr backend there is a static variable avr_no_call_main_p that
> is set in TARGET_INSERT_ATTRIBUTES and used in TARGET_ASM_FILE_END.
>
> This works as expected in non-LTO compilations, with LTO however,
> TARGET_INSERT_ATTRIBUTES runs in cc1[plus] but TARGET_ASM_FILE_END
> is run by lto1, hence the variable is not set as expected.
>
> What's the recommended way to handle such a situation?

Without looking too closely I assume there's an actual attribute somewhere
(on the main function decl?).  Instead of using a global variable you'd
check for the presence of the attribute.  Now - the question is whether
the TARGET_ASM_FILE_END behavior is only required in the TU with
the main() definition?  In that case this should work.

I see you emit a special symbol conditional so what you can also do is
create that as a global variable in the symbol table and rely on the middle-end
to output it.

>
> Thanks,
>
> Johann
>
>
>