[PATCH] D20337: [MC] Support symbolic expressions in assembly directives

[Nirav Davé via llvm-commits]

Ah. So our assembly output is the intersection of preprocessor assembler
and preprocessed assembler, so both gas and system assemblers can be used. The
best we can do is a emit an unindented line-directive-shaped comment that
if "#" is a comment character will be interpreted as such.

-Nirav

On May 25, 2016 4:58 PM, "Joerg Sonnenberger via llvm-commits" <
llvm-commits at lists.llvm.org> wrote:

> On Wed, May 25, 2016 at 12:12:03PM -0400, Nirav Davé wrote:
> > Both clang and GCC expect such directives to have a # prefix for input.
> >
> > That said, GCC isn't not consistent for output. For instance, my version
> of
> > arm-linux-gnueabi-gcc emits this directive with the line comment prefix
> '@'
> > (but still emits #APP for inline assembly) which the correspodning gas
> > interprets as a line comment and not a line directive.
>
> That's kind of my point. We don't create preprocessor assembler (foo.S),
> but
> preprocessed assembler (foo.s). As such, emitting # unconditionally is a
> bug and incompatible with system assemblers on platforms using a
> different comment marker.
>
> Joerg
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