[edk2-devel] [RFT PATCH v2 1/6] BaseTools/tools_def XCODE: Link X64 with -read_only_relocs suppress

[Marvin Häuser]

Hi Gerd,

> On 31. Mar 2023, at 12:53, Gerd Hoffmann <kraxel at redhat.com> wrote:
> 
>   Hi,
> 
>>> However, those issues might have been fixed and it’s not impossible
>>> Vitaly will give it another try eventually. In any case, I think our
>>> downstream variant of XCODE5 doesn’t require any level of special
>>> care, so it doesn’t really matter to us.
>>> 
>>> (Another thing to consider is despite the bugs are fixed, mtoc has a
>>> much higher overall code quality and more safety checks than GenFw,
>>> which is used for CLANGDWARF.)
>>> 
>>> The upstream toolchain has no future in my opinion, as mtoc has been
>>> deprecated and already failed to compile certain things (like it
>>> lacked Standalone MM types). The reason it still “worked” was
>>> because homebrew silently shipped a variant with a subset of our
>>> ocmtoc patches. So as I see it, taking our changes or dropping it
>>> entirely are the only sane options, even regardless of this
>>> particular issue you’re trying to fix. Personally, I have no
>>> preference.
>> 
>> I think both GenFw and mtoc are horrible hacks that should be phased
>> out once we can - with good cross-architecture Clang support for
>> native PE binaries, I'd hope macOS could move to CLANGPDB for all
>> targets.
> 
> What is the difference between CLANGPDB and CLANGDWARF?  Just the debug
> info format?

DWARF generates an ELF (which is utilized by UefiPayloadPkg) and PDB generates a PE directly.

Best regards,
Marvin

> 
> What is the support status?  Is CLANGDWARF expected to build edk2 on all
> platforms?  Including cross-builds?  Or will that work only after
> Rebecca's toolchain fix/cleanup series being merged?
> 
> Should we eventually switch from gcc to clang on linux too?
> 
> take care,
>  Gerd
> 



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