[PATCH] MC: Don't emit min version directives when -fno-integrated-as is on

[Jim Grosbach]

> On Jan 22, 2015, at 11:03 AM, Filipe Cabecinhas <filcab at gmail.com> wrote:
> 
> What would be the difference between shelling out to clang -cc1as or simply doing a no-op on -no-integrated-as?
> 
> We could also start not allowing clang (on OS X) to emit directives by default if the latest Xcode-shipped clang doesn't handle them. That is: Maybe we should say what the “ground truth” for MachO/OSX is, and which tools outside of llvm we should try to be compatible with.
> 
> This whole problem is due to clang emitting ".macosx_version_min" and other directives by default, and the latest Xcode-provided clang/as -q not handling them.

It’s far, far bigger than that. clang uses many assembly constructs that the non-integrated assembler doesn’t support. Passing clang generated assembly files into the cctools assembler is not supported and hasn’t been for a quite a while. The current cctools as(1) is deprecated.

-Jim


> Rafael: Yes, AFAICT that is the only case that is broken (and without the -c, but that's basically the same case).
> 
>   Filipe
> 
> On Thu, Jan 22, 2015 at 10:56 AM, Rafael Espíndola <rafael.espindola at gmail.com <mailto:rafael.espindola at gmail.com>> wrote:
> > If cctools as isn't supported, perhaps we should make -no-integrated-as
> > shell out to `clang -cc1as` on Darwin. Users may be relying on
> > -no-integrated-as implying cctools as quirks, though.
> 
> It is probably a good idea. Since cctools' as can't handle clang
> output, the only use case that might be broken by the change is "clang
> -c -no-integrated-as foo.s", no?
> 
> Cheers,
> Rafael
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