Re: correct combination (arch & abi) for rebulding gcc SRPM for RV64IMAFD on top of RISC-V Fedora image

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On Mon, Mar 15, 2021 at 11:24:47AM +0100, Florian Weimer wrote:
> * Takayuki Nagata:
> 
> > I think "--with-arch=" should be "rv64g" for gcc without compressed
> > instruction support, because the default is RV64GC[0].
> 
> As far as I understand it, there is no glibc port for RISC-V without
> compressed instruction support.  Presumably the GCC default reflects
> this.

Oh ah, is this so?  If so that's a problem for Billa because
he's trying to rebuild Fedora for the SHAKTI chip that lacks
compressed instructions.

But I had a look through all the RISC-V asm files in current glibc and
I can't see any compressed instructions there, nor any directives to
turn on the rvc option.

  $ egrep -i '(\bc\.|rvc)' `find sysdeps/riscv/ sysdeps/unix/sysv/linux/riscv/ -name '*.S' `

Do you know why glibc wouldn't understand the C extension?

Rich.

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