[Bug gas/28078] arm: fails to build when using armv8 neon with dotprod extension

[rearnsha at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28078

Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |rearnsha at gcc dot gnu.org

--- Comment #4 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
(In reply to Tamar Christina from comment #3)
> Hi,
> 
> >arm-unknown-linux-musleabihf-as -march=armv8.2-a+dotprod -mfpu=auto  test.s
> > Assembler messages:
> > Error: unknown floating point format `auto'
> > 
> > Error: unrecognized option -mfpu=auto
> 
> hmm no it looks like we don't have -mfpu=auto at the assembler level yet,
> only at the compiler level.
> 
> But trying it locally it does seem like something has broken..

This is down to a change in binutils (gas); but that was to fix a different
bug, so I don't think it can be reverted.

I think the solution is that we need to re-issue the architecture extensions
that relate to the FPU after emitting a .fpu directive.

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