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

Calculating dependencies ... done!
Dependency resolution took 1.07 s (backtrack: 0/20).

[ebuild  N     ] dev-build/b2-5.5.3::gentoo  USE="-examples" 1198 KiB
[ebuild  N     ] dev-libs/libatomic_ops-7.10.0::gentoo  531 KiB
[ebuild  N     ] dev-libs/boost-1.91.0-r2:0/1.91.0::gentoo  USE="bzip2 context nls python stacktrace zlib -debug -doc -icu -lzma -mpi -numpy -test -test-full -tools -zstd" PYTHON_TARGETS="python3_14 -python3_12 -python3_13" 199785 KiB
[ebuild  N     ] dev-libs/boehm-gc-8.2.12::gentoo  USE="large threads -cxx -static-libs" 1204 KiB
[ebuild  N     ] dev-embedded/sdcc-4.5.0::gentoo  USE="boehm-gc device-lib mcs51 sdcpp -doc -ds390 -ds400 -ez80-z80 -f8 -hc08 -mos65c02 -mos6502 -non-free -packihx -pdk13 -pdk14 -pdk15 -pdk16 -pic14 -pic16 -r2k -r2ka -r3ka -r800 -s08 -sdcdb -sm83 -stm8 -tlcs90 -ucsim -z80 -z80n -z180" 47130 KiB
[ebuild  N     ] sys-firmware/sigrok-firmware-fx2lafw-0.1.7-r2::gentoo  USE="-binary" 146 KiB

Total: 6 packages (6 new), Size of downloads: 249991 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by sys-firmware/sigrok-firmware-fx2lafw-0.1.7-r2::gentoo[-binary]
# required by =sys-firmware/sigrok-firmware-fx2lafw-0.1.7-r2 (argument)
>=dev-embedded/sdcc-4.5.0 device-lib mcs51