Re: port-alpha/58505: GCC 12.4.0 on alpha broken at -O2

[Rin Okuyama <rokuyama.rk%gmail.com@localhost>]

(cc: added to mrg@)

I've found this is due to isl; the failure started from mknative for
this change:

----
build and link libisl.
https://mail-index.netbsd.org/source-changes/2024/02/25/msg150123.html
----

(1) If the following files from isl are compiled with -O1:

----
isl_map_to_basic_set.c
isl_polynomial.c
isl_schedule*.c
isl_set_list.c
isl_space.c
isl_tab*.c
isl_tarjan.c
isl_union_map.c
----

test.c (provided by tnn@) can be compiled with -O2. However, still,
native build.sh fails early in tools.

(2) Even if all isl files are compiled with -O1, build.sh also
fails in tools.

(3) If all isl files are compiled with -O0, gcc cannot be linked
due to truncation of relocation.

(4) If isl is completely disabled, tools (including gcc) successfully
build natively.

Thanks,
rin