[Bug ld/22962] [RISCV] add abi subdirectories support to ld

[wilson at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=22962

--- Comment #7 from Jim Wilson <wilson at gcc dot gnu.org> ---
DJ Delorie provided some helpful info about Fedora RISC-V port in a chat and
I'm now starting to understand the problem.  Turns out that Fedora does put
libraries in /usr/lib64/lp64d, and then puts links in /usr/lib64.

However, we have 6 different arch/abi combinations that are officially
supported for linux (though not all upstream yet), and a theoretically infinite
number that are unofficially supported, as this is a customizable architecture.
 I'm concerned about how to actually implement that in ld.  It would be easier
to do it in gcc and not worry about ld.

On Fedora, running gcc -v tmp.c I see in the output
    -L/lib64/lp64d -L/usr/lib64/lp64d
so it appears that Fedora gcc is OK, but maybe that is a modification that
Fedora made to the gcc sources.

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