[Bug bootstrap/126526] [16, X86] Bootstrap comparison failure!

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126526

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
grep BUILD_CONFIG config.log
in the toplevel build directory should show what was used.