emerge -p -uvDU @world

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

Calculating dependencies... done!
Dependency resolution took 47.07 s.

[ebuild     U *] sys-devel/llvm-common-17.0.0_pre20230615::gentoo [17.0.0_pre20230609::gentoo] 187,170 KiB
[ebuild     U *] sys-devel/clang-common-17.0.0_pre20230615::gentoo [17.0.0_pre20230609::gentoo] USE="hardened stricter -default-compiler-rt -default-libcxx -default-lld -llvm-libunwind" 0 KiB
[ebuild     U  ] dev-perl/Net-HTTP-6.230.0::gentoo [6.220.0::gentoo] USE="-minimal -test" 0 KiB
[ebuild     U  ] net-firewall/ipset-7.17-r1::gentoo [7.17::gentoo] USE="dist-kernel -modules" 0 KiB
[ebuild     U *] dev-python/lit-17.0.0_pre20230615::gentoo [17.0.0_pre20230609::gentoo] USE="-test" PYTHON_TARGETS="python3_10 python3_11 python3_12" 0 KiB
[ebuild     U  ] app-emacs/ebuild-mode-1.64::gentoo [1.63::gentoo] 39 KiB
[ebuild     U *] sys-libs/libomp-17.0.0_pre20230615:0/17.0.0_pre20230615::gentoo [17.0.0_pre20230609:0/17.0.0_pre20230609::gentoo] USE="debug -gdb-plugin -hwloc -offload -ompt -test" ABI_X86="32 (64) (-x32)" LLVM_TARGETS="AMDGPU NVPTX" PYTHON_SINGLE_TARGET="python3_11 -python3_10 -python3_12%" 0 KiB
[ebuild  r  U *] sys-devel/llvm-17.0.0_pre20230615:17/17.0.0_pre20230615::gentoo [17.0.0_pre20230609:17/17.0.0_pre20230609::gentoo] USE="binutils-plugin debug doc libffi ncurses test xml -debuginfod -exegesis -libedit -xar -z3 -zstd" ABI_X86="32 (64) (-x32)" LLVM_TARGETS="(AArch64) (AMDGPU) (ARM) (AVR) (BPF) (Hexagon) (Lanai) (LoongArch) (MSP430) (Mips) (NVPTX) (PowerPC) (RISCV) (Sparc) (SystemZ) (VE) (WebAssembly) (X86) (XCore) -ARC -CSKY -DirectX -M68k -SPIRV -Xtensa" 0 KiB
[ebuild  rR    ] app-forensics/aflplusplus-4.07c::gentoo  USE="-test" PYTHON_SINGLE_TARGET="python3_11 -python3_10" 0 KiB
[ebuild  r  U *] sys-devel/clang-17.0.0_pre20230615:17/17.0.0_pre20230615::gentoo [17.0.0_pre20230609:17/17.0.0_pre20230609::gentoo] USE="debug doc extra (pie) static-analyzer test xml (-ieee-long-double)" ABI_X86="32 (64) (-x32)" LLVM_TARGETS="(AArch64) (AMDGPU) (ARM) (AVR) (BPF) (Hexagon) (Lanai) (LoongArch) (MSP430) (Mips) (NVPTX) (PowerPC) (RISCV) (Sparc) (SystemZ) (VE) (WebAssembly) (X86) (XCore) -ARC -CSKY -DirectX -M68k -SPIRV -Xtensa" PYTHON_SINGLE_TARGET="python3_11 -python3_10 -python3_12%" 0 KiB
[ebuild     U *] sys-libs/compiler-rt-17.0.0_pre20230615:17::gentoo [17.0.0_pre20230609:17::gentoo] USE="clang debug test" ABI_X86="32 (64)" 0 KiB
[ebuild     U *] sys-libs/compiler-rt-sanitizers-17.0.0_pre20230615:17::gentoo [17.0.0_pre20230609:17::gentoo] USE="asan cfi clang debug dfsan gwp-asan hwasan libfuzzer lsan memprof msan profile safestack scudo test tsan ubsan xray -orc (-shadowcallstack)" ABI_X86="32 (64)" 0 KiB
[ebuild     U *] sys-devel/clang-runtime-17.0.0_pre20230615:17::gentoo [17.0.0_pre20230609:17::gentoo] USE="compiler-rt openmp sanitize -libcxx" ABI_X86="32 (64) (-x32)" 0 KiB
[ebuild     U *] dev-util/lldb-17.0.0_pre20230615:0/17.0.0_pre20230615::gentoo [17.0.0_pre20230609:0/17.0.0_pre20230609::gentoo] USE="debug libedit ncurses python xml -lzma -test" PYTHON_SINGLE_TARGET="python3_11 -python3_10 -python3_12%" 0 KiB
[ebuild     U *] sys-libs/libcxxabi-17.0.0_pre20230615::gentoo [17.0.0_pre20230609::gentoo] USE="clang -static-libs -test" ABI_X86="32 (64) (-x32)" 0 KiB
[ebuild     U *] sys-libs/libcxx-17.0.0_pre20230615::gentoo [17.0.0_pre20230609::gentoo] USE="clang (libcxxabi) -static-libs -test" ABI_X86="32 (64) (-x32)" 0 KiB
[ebuild     U *] sys-devel/lld-17.0.0_pre20230615:17/17.0.0_pre20230615::gentoo [17.0.0_pre20230609:17/17.0.0_pre20230609::gentoo] USE="debug test -zstd" 0 KiB
[ebuild     U *] sys-apps/portage-9999::gentoo [3.0.48.1-r1::gentoo] USE="(ipc) native-extensions rsync-verify (xattr) -apidoc -build -debug -doc -gentoo-dev (-selinux) -test" PYTHON_TARGETS="pypy3 python3_10 python3_11 python3_12" 0 KiB
[ebuild  rR    ] dev-util/perf-6.3::gentoo  USE="clang crypt doc gtk zlib -audit -babeltrace -debug -java -libpfm -lzma -numa -perl -python -slang -systemtap -unwind -zstd" PYTHON_TARGETS="python3_10 python3_11" 0 KiB

Total: 19 packages (17 upgrades, 2 reinstalls), Size of downloads: 187,209 KiB

The following packages are causing rebuilds:

  (sys-devel/clang-17.0.0_pre20230615:17/17.0.0_pre20230615::gentoo, ebuild scheduled for merge) causes rebuilds for:
    (dev-util/perf-6.3:0/0::gentoo, ebuild scheduled for merge)
  (sys-devel/llvm-17.0.0_pre20230615:17/17.0.0_pre20230615::gentoo, ebuild scheduled for merge) causes rebuilds for:
    (app-forensics/aflplusplus-4.07c:0/0::gentoo, ebuild scheduled for merge)
    (dev-util/perf-6.3:0/0::gentoo, ebuild scheduled for merge)
    (sys-devel/clang-17.0.0_pre20230615:17/17.0.0_pre20230615::gentoo, ebuild scheduled for merge)

!!! The following binary packages have been ignored due to non matching USE:

    =dev-util/perf-6.3 slang

NOTE: The --binpkg-respect-use=n option will prevent emerge
      from ignoring these binary packages if possible.
      Using --binpkg-respect-use=y will silence this warning.

!!! The following binary packages have been ignored due to changed dependencies:

     dev-util/perf-6.3::gentoo

NOTE: The --binpkg-changed-deps=n option will prevent emerge
      from ignoring these binary packages if possible.
      Using --binpkg-changed-deps=y will silence this warning.