These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.81 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/libatomic_ops-7.10.0::gentoo  531 KiB
[ebuild  N     ] dev-libs/boehm-gc-8.2.12::gentoo  USE="large threads -cxx -static-libs" 1204 KiB
[ebuild  NS    ] sys-devel/gcc-16.2.1_p20260926:16::gentoo [15.2.1_p20260214:15::gentoo] USE="algol68%* cet (cxx) (default-stack-clash-protection) (default-znow) fortran graphite lto nls openmp pgo (pie) sanitize ssp zstd -ada -cobol (-custom-cflags) -d -debug -doc (-fixed-point) -go -hardened (-ieee-long-double) -jit -libgdiagnostics (-libssp) -modula2 (-multilib) -objc -objc++ -objc-gc (-pch) -rust -systemtap -test (-time64) -valgrind -vanilla -vtv" 96836 KiB
[ebuild  N     ] dev-util/godcc-1.0::gentoo  246 KiB

Total: 4 packages (3 new, 1 in new slot), Size of downloads: 98815 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by dev-util/godcc-1.0::gentoo
# required by =dev-util/godcc-1.0 (argument)
>=sys-devel/gcc-16.2.1_p20260926 algol68