Re: What is the recommended setup for crossbuilding kernel+world?

On Apr 8, 2026, at 4:08 PM, Warner Losh <[email protected]> wrote:
> 
> 
> 
> On Wed, Apr 8, 2026, 5:00 PM Bakul Shah <[email protected]> wrote:
> Recently crossbuilding -current arm64 world on an 15-stable
> amd64 machine took out host's /lib/libsys.so.7 which broke
> most everything! I tried rebuilding after removing its
> /usr/obj/.../current/arm64.aarch64/ tree and that replaced
> many .o files in /usr/lib! Rather than fixup my old setup,
> I'd like to know what is recommended.
> 
> Is it possible to build as a normal user (so that build can't
> mistakenly blow away host's system files)?
> 
> I do this all the time. I set MAKEOBJDIRPREFIX to ~/obj.

Thanks! I should've realized this! [Though this doesn't
explain why files in /lib /usr/lib were overwritten.]

I just did a chmod -R /usr/obj (& will probably create a
separate user just for builds).