Linux binaries now target glibc 2.17 (
f53ef36)
Bun lowered its minimum supported glibc from 2.26 to 2.17, expanding compatibility to older enterprise distros like RHEL/CentOS 7 and Amazon Linux 1. The build now wraps additional glibc symbols (getrandom, quick_exit) and provides runtime fallbacks so newer features still work when available without forcing a newer link-time dependency.
memfd_create is now cacheable and disableable (91d066b)
Bun now remembers ENOSYS for memfd_create, so repeated Blob/spawn fallbacks stop retrying a syscall that isn't available on older kernels or seccomp-restricted environments. A new BUN_FEATURE_FLAG_DISABLE_MEMFD also lets users force the fallback path for testing or sandboxing.
Bun builds can now use an external Zig install (
d398bd5)
BUN_ZIG_PATH now overrides the vendored Zig compiler, letting builds reuse an existing Zig installation instead of fetching Bun's pinned copy. The path handling covers ~ expansion and repo-relative paths, which makes the override usable in both configure-time and Ninja regen flows.
Parallel Zig is enabled on Linux local builds (7a79050)
Bun bumped its parallel Zig commit and removed the Linux gate for local builds now that the self-hosted ELF merge produces a complete bun-zig.o. That should speed up Linux developer builds while CI and Windows stay on the stable compiler.
ReadableStream close callbacks no longer form a GC cycle (55b62ef)
The WebCore stream source now stores onclose in a cached slot instead of a rooted Strong, breaking a reference cycle that could keep stream sources alive after release. The fix also adjusts close handling so callbacks are queued once and then cleared.
Other misc changes
- Reverted the previous ReadableStream/Windows ref fix workarounds, replaced by the new cycle fix.
- Added and expanded docs for bunfig and install/kernel compatibility.
- Updated lifecycle/install configuration docs.