Windows build stops endlessly recompiling (
58ebb16)
Fixes a path-suffix mismatch in the DirectBuild codegen host tool on Windows, where Ninja expected codegen-tool but clang emitted codegen-tool.exe. That missing output was causing a permanent rebuild cascade through TinyCC and all C++ objects.
Bun now supports IR PGO build modes (
0ebe66d)
Adds --pgo-generate=<dir> and --pgo-use=<file.profdata> to the build system, with validation that they’re mutually exclusive. The flags are threaded into compilation and WebKit local builds, enabling instrumented/profile-guided optimized builds.
Local builds share caches across checkouts (0d09afe)
Changes the default local cacheDir from per-build to a machine-shared cache under ~/.bun/build-cache (or BUN_INSTALL/build-cache). This means ccache, Zig artifacts, tarballs, and prebuilt WebKit can be reused across worktrees instead of being rebuilt each time.
Local WebKit builds inherit the CPU target (8effa8c)
Separates CPU-target flags from other global compiler flags so local WebKit builds still get -march/-mcpu even though WebKit manages its own optimization and sanitizer flags. This avoids accidentally compiling JSC for a generic CPU while the rest of Bun targets a newer microarchitecture.
Zig checks are now first-class Ninja targets (686eda3)
Integrates zig build check[-*] into the main build graph so the check targets depend on codegen outputs automatically. This removes a stale-codegen footgun and makes the checks chainable via stamp files.
UDP sockets now surface ICMP errors and truncation (
9850dd5)
On Linux, UDP sockets now enable IP_RECVERR/IPV6_RECVERR so ICMP failures like port-unreachable can be delivered back to the socket instead of being silently dropped. The API also exposes MSG_TRUNC-style receive metadata to let callers detect datagram truncation.
FormData boundary parsing no longer crashes on malformed quotes (376a036)
Fixes a panic in multipart boundary parsing when the boundary value starts with a quote but never closes cleanly, including cases like boundary=". Malformed inputs now reject cleanly instead of crashing the runtime.
Tar extraction skips absolute Windows paths (edc40e9)
Prevents archive extraction from honoring absolute Windows paths after normalization, which could otherwise escape the target directory. The new test covers drive-letter paths and verifies they’re skipped during extraction.
DNS lookup avoids a fixed stack buffer overflow risk (de10885)
Replaces the fixed 1024-byte stack buffer used for hostname lookup with a stack-fallback allocator that spills to the heap for longer names. This removes a crash/truncation risk for long hostnames.
Other misc changes
- Removed 29 dead/unreferenced files and patch leftovers (c721d35)
- Spurious build/test flake fixes and minor build-script cleanup (
d2e6753, 485ec52, 871f660, d8ebb9b, d27d84f, 58ebb16, 0d09afe, 0ebe66d, 8effa8c) - Build-system docs/comments updated to match the new cache and dependency behavior (multiple commits)