[PATCH] D39534: [libunwind] Add ifdefs around ELF specific parts of UnwindRegisters*.S for ARM

[Martin Storsjö via Phabricator via cfe-commits]

mstorsjo added a comment.

In https://reviews.llvm.org/D39534#915935, @jroelofs wrote:

> In https://reviews.llvm.org/D39534#915920, @mstorsjo wrote:
>
> > In https://reviews.llvm.org/D39534#915916, @compnerd wrote:
> >
> > > Very well, if thats the current implementation in the AsmParser, thats reasonable.  I don't think that the directive has anything to do with the file format though.
> >
> >
> > I can agree with that. In addition to making the assembler accept/reject certain instructions though, it actually does another thing which actually is file format specific - it sets the eabi attributes that indicates that the object file contains such instructions.
>
>
> Are they eabi/gnueabi things?


I think so. You can read them with `readelf -A foo.o`, and override them with manual `.eabi_attribute` attributes. (That's useful e.g. for indicating that while a binary contains NEON instructions, it doesn't strict require them for running. E.g. raspbian does check such tags for checking that all binaries work on their baseline of armv6.)


Repository:
  rL LLVM

https://reviews.llvm.org/D39534