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Verified locally that the bump is fully transitive — no $ drv=$(nix eval --raw .#rts.drvPath)
$ nix-store --query --requisites "$drv" | grep -E 'clang-(wrapper-)?(19|20)'
(empty)
$ nix-store --query --requisites "$drv" | grep -E 'clang-(wrapper-)?21' | sort -u
.../clang-21.1.8.drv (×2)
.../clang-wrapper-21.1.8.drv (×10 bootstrap variants)So the rts builds against |
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Mechanical \`llvmPackages_20\` → \`llvmPackages_21\`, \`clang_20\` → \`clang_21\`, \`clang-20\`/\`wasm-ld-20\` → \`clang-21\`/\`wasm-ld-21\`, across: - \`flake.nix\` (\`WASM_CLANG\`, \`WASM_CLANG_LIB\`, \`CLANG\`) - \`nix/rts.nix\`, \`nix/tests.nix\`, \`nix/ic-wasm.nix\` - \`rts/Makefile\`, \`rts/README.md\`, \`test/ld/Makefile\` \`rustStdDepsHash\` unchanged (no rust-nightly move). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Mechanical bump from clang/llvm 20 to 21 across the nix flake and the RTS Makefile. Same shape as PR #6009 (clang 19 → 20).
flake.nix—WASM_CLANG,WASM_CLANG_LIB,CLANGnix/rts.nix,nix/tests.nix,nix/ic-wasm.nix—llvmPackages_20→llvmPackages_21rts/Makefile,rts/README.md,test/ld/Makefile—clang-20/wasm-ld-20→clang-21/wasm-ld-21rustStdDepsHashunchanged (rust-nightly didn't move).Test plan
tests,gc-tests,common-testsall pass with the v21 toolchain on linux and macOS runners.nix build .#rtssucceeds locally.nix build .#tests.ldregenerates the samerepresentative.linked.wat.ok(clang-21'swasm-ldmay shift the golden — accept if so).Draft until #6009 merges; converting + merge in a week.
🤖 Generated with Claude Code