>>> Emerging : portage://dev-lang/spidermonkey-140.17.0:run?{[]}

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

Calculating dependencies... done!

 └─step  1─┤ useflag portage://dev-lang/rust-bin-1.94.1 (llvm_slot_21)

 └─step  2─┤ download  portage://dev-lang/rust-bin-1.94.1
             │           └─ file ─┤ 183.38 Mb  	 rust-1.94.1-x86_64-unknown-linux-gnu.tar.xz
             │ download  portage://dev-lang/spidermonkey-140.17.0
             │           └─ file ─┤ 608.10 Mb  	 firefox-140.17.0esr.source.tar.xz
             │                    │ 15.26 Kb  	 firefox-140esr-patches-13.tar.xz
             │                    │ 3.58 Kb  	 spidermonkey-140-patches-02.tar.xz
             │ download  portage://dev-libs/nspr-4.40
             │           └─ file ─┤ 985.34 Kb  	 nspr-4.40.tar.gz
             │ download  portage://dev-util/cbindgen-0.29.4
             │           └─ file ─┤ 6.06 Mb  	 cbindgen-0.29.4-crates.tar.xz
             │                    │ 246.72 Kb  	 cbindgen-0.29.4.tar.gz
             │ download  portage://llvm-core/llvm-21.1.8
             │           └─ file ─┤ 151.59 Mb  	 llvm-project-21.1.8.src.tar.xz
             │ download  portage://llvm-core/llvm-toolchain-symlinks-21

 └─step  3─┤ install   portage://dev-libs/nspr-4.40
             │           └─ conf ─┤ USE = "-debug"
             │ install   portage://llvm-core/llvm-toolchain-symlinks-21
             │           └─ conf ─┤ USE = "-multilib-symlinks -native-symlinks"
             │                    │ SLOT = "21"

 └─step  4─┤ install   portage://llvm-core/llvm-21.1.8
             │           └─ conf ─┤ USE = "zstd binutils-plugin libffi (-debuginfod) -debug -doc -exegesis -libedit -test -verify-sig -xml -z3"
             │                    │ LLVM_TARGETS = "(AArch64) (AMDGPU) (ARM) (AVR) (BPF) (Hexagon) (Lanai) (LoongArch) (MSP430) (Mips) (NVPTX) (PowerPC)
             │                    │                   (RISCV) (SPIRV) (Sparc) (SystemZ) (VE) (WebAssembly) (X86) (XCore) -ARC -CSKY -DirectX -M68k -Xtensa"
             │                    │ SLOT = "21/21.1"
             │ install   portage://dev-lang/rust-bin-1.94.1 (USE modified)
             │           └─ conf ─┤ USE = "clippy doc rustfmt -rust-analyzer -rust-src -verify-sig"
             │                    │ CPU_FLAGS_X86 = "sse2*"
             │                    │ LLVM_SLOT = "21"
             │                    │ SLOT = "1.94.1"
             │ run       portage://dev-libs/nspr-4.40
             │ run       portage://llvm-core/llvm-toolchain-symlinks-21

 └─step  5─┤ install   portage://dev-util/cbindgen-0.29.4
             │           └─ conf ─┤ USE = "-debug -test"
             │ run       portage://llvm-core/llvm-21.1.8

 └─step  6─┤ install   portage://dev-lang/spidermonkey-140.17.0
             │           └─ conf ─┤ USE = "jit -clang -debug -test"
             │                    │ LLVM_SLOT = "21 -20"
             │                    │ SLOT = "140/140.11.0"

 └─step  7─┤ run     portage://dev-lang/spidermonkey-140.17.0

Total: 17 actions (1 useflag, 6 downloads, 6 installs, 4 runs), grouped into 7 steps.
       950.36 Mb to be downloaded.


>>> Assumptions taken during proving & planning:

  USE flag change (1 package):
  Add to /etc/portage/package.use:
    dev-lang/rust-bin llvm_slot_21