Integrated: 8318692: Add instructions for creating Ubuntu-based sysroot for cross compilation

[Zixian Cai]

On Tue, 24 Oct 2023 02:10:42 GMT, Zixian Cai <zcai at openjdk.org> wrote:

> Sometimes it's useful to have a Ubuntu-based chroot when you want to ensure compatibility of your deployment target and/or have access to packages that might not be in Debian upstream for some architectures.
> 
> Ubuntu-based sysroot warrants a separate instruction because `symlinks` is in the `universe` repository, and without that, `debootstrap` might fail with package not found, but it's not immediately obvious why.
> 
> This should be merged after #16332 for consistent formatting. Once #16332 is merged, I will update this PR.

This pull request has now been integrated.

Changeset: c3cdfe2a
Author:    Zixian Cai <zcai at openjdk.org>
Committer: Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/c3cdfe2a328c59213b614a2b723184582550f8c7
Stats:     26 lines in 2 files changed: 26 ins; 0 del; 0 mod

8318692: Add instructions for creating Ubuntu-based sysroot for cross compilation

Reviewed-by: erikj, shade

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PR: https://git.openjdk.org/jdk/pull/16331