Re: [PATCH RFC 4/5] x86/alternative: Improve code generation readability

[Josh Poimboeuf]

On Wed, Apr 09, 2025 at 02:27:28PM -0700, Josh Poimboeuf wrote:
> On Wed, Apr 09, 2025 at 02:20:55PM -0700, Linus Torvalds wrote:
> > On Wed, 9 Apr 2025 at 12:51, Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:
> > >
> > > What if we were to use a global asm() to define an alternative .macro
> > > whenever "alternative.h" gets included?
> > 
> > Yeah, I wouldn't mind that, but I have this dim memory of us having
> > tried it at some point and it didn't work.
> > 
> > I think the issue was that the in-compiler assembler was not as
> > complete as the external one (ie not doing macros at all or something
> > like that).
> 
> It seems to work with GCC 14 and Clang 18 at least.  I can try to find
> some old toolchains to test with.

Actually, Clang *compiled*, but on closer inspection it's actually
silently omitting the inline asm :-/

So yeah, that's not going to work.

-- 
Josh