[PATCH] Pass -I flags to the integrated assembler

[David Peixotto]

> On Tue, Nov 12, 2013 at 01:03:32PM -0800, David Peixotto wrote:
> > It looks like -Wa,-Ifoo is not supported by current clang:
> >
> >   $ clang -c test/ias.s  -Ifoo_dir -integrated-as -target x86 -Wa,-I -
> ###
> > 2>&1 | grep -- -I
> >   clang: error: unsupported argument '-I' to option 'Wa,'
> 
> Correct, nothing claims the option, so it complains.
> Look for CollectArgsForIntegratedAssembler in Tools.cpp.


Ok, to summarize the discussion so far, the options are:

1. Pass -I args to both the integrated assembler (my current patch) and
external assembler (need to fix bug in current clang to pass -I when
directly invoking as).

2. Change -Wa to accept -I

3. Both 1+2

It seems from limited experimentation by Rafael and myself that GCC
implements #3. What should we implement for clang?

I think I am in favor of option 3 because it gives some flexibility for
passing arguments to the assembler, maintains the same behavior when using
an integrated or external assembler, and is compatible with gcc behavior.