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

Joerg Sonnenberger via llvm-commits llvm-commits at lists.llvm.org
Wed May 25 13:58:23 PDT 2016

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.


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