RISC-V ABI issue with ULEB128

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I'm not sure exactly the effect on RISC-V binaries, but I wanted to
raise it here to get the attention of the Fedora toolchain team ...

Here's the bug:

https://sourceware.org/bugzilla/show_bug.cgi?id=31179
RISC-V: The SET/ADD/SUB fix breaks ABI compatibility with 2.41 objects

It refers to this change in binutils 2.41:

https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=73d931e560059a87d76f528fafbb4270a98746bc

As far as I understand the issue (which is not too far) this mainly
affects shipped *.o and *.a files (ie. static libraries and similar)
which were compiled with binutils < 2.41, which either won't link
correctly or will give a linker error when using GNU ld from binutils 2.41.

Unclear if it also affects *.so files (which would be a much more
serious ABI break), and also if it affects most binaries or just a
few.  I initially thought this only affected programs using 128 bit
ints, so didn't think it was too important, but after reading the
commit I'm not sure that is really true.

There's been discussion about adding an ELF tag, but that seems very
problematic to me:
https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/414

Rich.

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