[Bug target/91602] GCC fails to build for riscv in a combined tree due to misconfigured leb128 support

[wilson at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91602

--- Comment #6 from Jim Wilson <wilson at gcc dot gnu.org> ---
By the way, the underlying problem here is, as Andrew Waterman mentioned, that
the RISC-V linker does aggressive link time relaxations to reduce code size,
and this makes lib128 with label subtraction unsafe.  The RISC-V port is not
the only port that has this problem.  The RISC-V port is just the only one that
gets it right.  The others can silently produce incorrect debug info.  I have
evidence that every binutils target except RISC-V that does aggressive link
time relaxation to reduce code size is doing it wrong.  There is a bug in
binutils bugzilla where I listed linker relaxation code size related issues,
but I have since found and fixed other problems in the RISC-V port, so it is
incomplete.
  https://sourceware.org/bugzilla/show_bug.cgi?id=22756#c2