compiletest: `//@ aux-crate` seems to only actually work for dylibs

[jieyouxu]

... And it seems to never hit staticlibs or rlibs?

[jieyouxu]

FWIW //@ aux-build seems to work, so idk

[ehuss]

You should be able to use aux-crate with rlibs. You'll need to use no-prefer-dynamic to force it to not use a dylib. Can you say why it doesn't seem to be working?

staticlibs should be doable, but would probably require extra rustflags to specify what and where to link.

[jieyouxu]

I tried this on windows msvc, aux file already has //@ no-prefer-dynamic but had a rlib crate type, and it was looking for a .dll with the --extern flag but I see the aux build output directory has libname.rlib.

Haven't investigated deeply yet, just opening an issue to remind myself to double check.

Perhaps something about the extern path calculation is not adding up versus the crate type.