[Bug target/106531] -march=rv32iabmc should also enable zba, zbb, zbc, zbs

[andrew at sifive dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106531

Andrew Waterman <andrew at sifive dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrew at sifive dot com

--- Comment #1 from Andrew Waterman <andrew at sifive dot com> ---
It turns out there is no such thing as the B extension; it was a working name
for a draft proposal a few years ago but wasn't (and presumably won't be)
ratified.  The correct behavior is to reject B but accept zba, zbb, zbc, and
zbs.