rustbuild: x86_64-unknown-linux-musl is not installed.

[fzgregor]

Hi,

I ran into some issues trying to build and install Rust with a customized musl c library. In short it seams the musl std crate is build during make all but not installed in the subsequent make install. Manually copying the rlibs from the build directory solves the issue and rustc is able to build for the x86_64-unknown-linux-musl target.

I wonder if that is an issue of the build system or me using it.

The longer story is on stackoverflow.

My build environment is here.

[est31]

The best tool to build std right now is xargo: https://github.com/japaric/xargo

In the future hopefully cargo will be std aware and can build std on demand.

[fzgregor]

xargo look appealing. But I can't find to much documentation. This doesn't help as well ;) .

How would I go about using it with my customized musl library?

[alexcrichton]

I believe this is a dupe of #39235, but thanks for the report!