[Bug target/113652] [14/15 regression] Failed bootstrap on ppc unrecognized opcode: `lfiwzx' with -mcpu=7450

["segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113652

--- Comment #26 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Michael Meissner from comment #23)
> 1) Ignore it and say to the users don't do that.
> 
> 2) Prevent the IEEE 128-bit libgcc bits from being built on a BE or 32-bit
> LE system unless some configure switch is used.  Or just kick the can down
> the road, and don't provide a configure option in GCC 14, and if people are
> interested do it in GCC 15.
> 
> 3) Only build the IEEE 128-bit libgcc bits if the user configured the
> compiler with --with-cpu=power7, --with-cpu=power8, --with-cpu=power9,
> --with-cpu=power10 (and in the future --with-cpu=power11 or
> --with-cpu=future).  This could be code that if __VSX__ is not defined, the
> libgcc support functions won't get built.  We would then remove the -mvsx
> option from the library support functions.

4) Build those pieces of libgcc with the flags needed for that piece of code.
Like, just as is required for all other code.