Dylan Conway 6c119d608e Simplify bun run build:local to auto-build JSC (#26645) ...

## Summary

- `bun run build:local` now handles everything: configuring JSC,
building JSC, and building Bun in a single command on all platforms
(macOS, Linux, Windows). Previously required manually running `bun run
jsc:build:debug`, deleting a duplicate `InspectorProtocolObjects.h`
header, and then running the Bun build separately.
- Incremental JSC rebuilds: JSC is built via `add_custom_target` that
delegates to JSC's inner Ninja, which tracks WebKit source file changes
and only rebuilds what changed. `ninja -Cbuild/debug-local` also works
after the first build.
- Cross-platform support:
  - macOS: Uses system ICU automatically
- Linux: Uses system ICU via find_package instead of requiring bundled
static libs
- Windows: Builds ICU from source automatically (only when libs don't
already exist), sets up static CRT and ICU naming conventions

### Changes
- cmake/tools/SetupWebKit.cmake: Replace the old WEBKIT_LOCAL block
(which just set include paths and assumed JSC was pre-built) with full
JSC configure + build integration for all platforms
- cmake/targets/BuildBun.cmake: Add jsc as a build dependency, use
system ICU on Linux for local builds, handle bmalloc linking for local
builds
- CONTRIBUTING.md / docs/project/contributing.mdx: Simplify "Building
WebKit locally" docs from ~15 lines of manual steps to 3 lines

## Test plan

- [x] macOS arm64: clean build, incremental rebuild, WebKit source
change rebuild
- [x] Windows x64: clean build with ICU, incremental rebuild with ICU
skip
- [x] Linux x64: build with system ICU via find_package
- [x] No duplicate InspectorProtocolObjects.h errors
- [x] build/debug-local/bun-debug --version works

Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

2026-01-31 16:52:51 -08:00

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