[Bug target/125853] [17 Regression] Bootstrap broken on RISC-V

[tclin914 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125853

--- Comment #4 from Tsung Chun Lin <tclin914 at gmail dot com> ---
Thanks Jeffrey. I haven't been able to reproduce this with --disable-multilib —
with that config MULTILIB_SELECT is just ". ;" and running the same self-test
command against a --disable-multilib stage1 xgcc works for me.

Could you share, for the build that actually fails:
  - the full configure command line;
  - cat gcc/multilib.h (or xgcc -print-multi-lib) from the build dir;
  - the value of TARGET_RISCV_DEFAULT_ARCH in gcc/tm.h?

That'll let me pin down which entry produces the empty -march=.