[build] Upgrade @llvm to 0.8.10 - #17780
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Bumps the hermetic @llvm toolchain from 0.8.9 to 0.8.10, picking up recent linker/toolchain fixes (dSYM strip via rules_cc env, per-version COFF ThinLTO patch split, 3-stage FDO bootstrap). 0.8.10 rather than the latest 0.8.11: 0.8.11's macOS sysroot changes (passing a relative -isysroot alongside --sysroot) break the hermetic macOS C build of the bzip2-sys crate ("'stdlib.h' file not found"). 0.8.10 is the latest version that builds cleanly. Trunk pins @llvm as a plain bazel_dep with no patch/override, so this is a straight version bump. Validated locally on macOS: full compile+link of //rust:selenium-manager against @llvm 0.8.10 and the binary runs.
This was referenced Aug 10, 2026
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Summary
Bumps the hermetic
@llvmtoolchain from 0.8.9 → 0.8.10, picking up recent linker/toolchain fixes (dSYM strip via rules_cc env, per-version COFF ThinLTO patch split, 3-stage FDO bootstrap). Trunk pins@llvmas a plainbazel_depwith no patch/override, so this is a straight one-line version bump.Why 0.8.10 and not the latest 0.8.11
0.8.11's macOS sysroot changes (#642 "Pass
-isysrooton macOS as well as--sysroot", #652 "Link Clang Darwin sysroot precedence") break the hermetic macOS C build: thebzip2-syscrate fails with'stdlib.h' file not foundbecause a relative-isysroot external/llvm++osx+macos_sdk/sysrootis passed and the SDK's C headers aren't resolved. 0.8.10 is the latest version that builds cleanly for us.Validation
Built locally on macOS (arm64) against
@llvm0.8.10:bazel build //rust:selenium-managercompiles + links the full crate graph (including thebzip2-sys/lzma-sys/zstd-sysC build scripts that exercise the@llvmC toolchain).selenium-manager 0.4.47-nightly).CI exercises the full Linux/macOS/Windows matrix.