* Andrea Bolognani:
Wouldn't changing -mabi effectively make the result a new Fedora
architecture? IIUC, binaries built with -mabi=lp64d wouldn't be able
to load libraries built with -mabi=lp64dv and vice versa.
If that's correct, then we can't simply have a single "riscv64"
architecture: instead, we need to call what we have today
riscv64_lp64d, and be ready for riscv64_lp64dv as well as whatever
comes next.
Right.
It would be somewhat similar to existing architectures that can be
used in both Little-Endian (ppc64le) and Big-Endian (ppc64) modes.
With different paths, it would be more like i686 and x86_64. That is,
you can build and run software for both variants from the same operating
system image. That's not the case for ppc64 and ppc64le.
This is quite different from just bumping the ISA baseline, where
existing binaries and libraries are still usable in the new
environment.
Right, changing the vector calling convention may change the size of
jmp_buf, and then you have a new ABI even if use of the vector features
is optional.
Thanks,
Florian