[Bug c++/106978] Internal compiler error including unordered_map

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106978

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Ben Fulton from comment #0)
> 502:5: internal compiler error: Illegal instruction

This is not a GCC bug, it means your gcc executables were compiled for a
different CPU and use instructions that are not supported on your machine. It's
probably not GCC itself using those instructions, but something in the libgmp
or libmpfr or libmpc support libraries that GCC links to.