Re: [PATCH v3] x86/build: use --orphan-handling linker option if available

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Fri, Mar 11, 2022 at 01:37:54PM +0100, Jan Beulich wrote:
> As was e.g. making necessary 4b7fd8153ddf ("x86: fold sections in final
> binaries"), arbitrary sections appearing without our linker script
> placing them explicitly can be a problem. Have the linker make us aware
> of such sections, so we would know that the script needs adjusting.
> 
> To deal with the resulting warnings:
> - Retain .note.* explicitly for ELF, and discard all of them (except the
>   earlier consumed .note.gnu.build-id) for PE/COFF.
> - Have explicit statements for .got, .plt, and alike and add assertions
>   that they're empty. No output sections will be created for these as
>   long as they remain empty (or else the assertions would cause early
>   failure anyway).
> - Collect all .rela.* into a single section, with again an assertion
>   added for the resulting section to be empty.
> - Extend the enumerating of .debug_* to ELF. Note that for Clang adding
>   of .debug_macinfo is necessary. Amend this by its Dwarf5 counterpart,
>   .debug_macro, then as well (albeit more may need adding for full
>   coverage).

You might also want to add that LLVM ld requires explicit handling of
.symtab, .strtab and .shstrtab.

> 
> Suggested-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Thanks, Roger.