deno_sysroot_build

Deno for Linux sysroot build.

This allows deno executables to link against older versions of glibc. The sysroot itself is only there to provide appropriately-versioned .a files to a linker running on the main system.

We don't actually build deno in a sysroot or chroot with this project. Instead, it allows us to pass -L and --sysroot flags to the linker which redirect the link phase from the system libraries (which would tie us to a much later version of GLIBC) to the sysroot libraries (which are taken from a much older version of Ubuntu).

Supported architectures

• aarch64
• x86_64

To add a new architecture, add the appropriate Ubuntu mirror in _debootstrap.sh and add the appropriate target to ./build.sh. Note that this requires support for the platform in your local docker instance and at the time of writing, only these two platforms are supported.

Rebuilding

1. Run build.sh on a system with Docker. If building on Apple Silicon, you may need to disable Rosetta from the Docker settings.
2. Upload the sysroot-*.tar.xz files as releases.
3. Update deno build scripts to point at new sysroot release