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

Calculating dependencies ... done!
Dependency resolution took 1.58 s (backtrack: 0/20).

[ebuild     U  ] sys-devel/gcc-15.3.1_p20261002:15::gentoo [15.2.1_p20260214:15::gentoo] USE="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" 90365 KiB

Total: 1 package (1 upgrade), Size of downloads: 90365 KiB