compiletest: Support --extern modifiers with proc-macro directive
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So that `pub-priv1.rs` test does not have to (ab)use the `aux-crate` directive for this purpose. This is very edge-casey so I don't think we should document this in rustc-dev-guide. If someone needs to do this they will look at the code and easily find the functionality. This is a bit hacky since `--extern priv:pm.rs` is not valid, but we can make our directives work however we want. And I think this is a fine pragmatic approach. Doing it "the right way" would be a lot of work for not much gain. Plus, that work can be done incrementally in small steps in the future if wanted.
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--extern options with proc-macro directive--extern modifiers with proc-macro directive
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So that the
src/tools/compiletest/src/directives/auxiliary/tests.rstest does not have to (ab)use theaux-cratedirective for this purpose.This is very edge-casey so I don't think we should document this in rustc-dev-guide. Mentioning it will confuse more than it helps. If someone needs to do this they will look at the code and easily find the functionality.
This is a bit hacky since
--extern priv:pm.rsis not valid, but we can make our directives work however we want. And I think this is a fine pragmatic approach. Doing it "the right way" would be a lot of work for not much gain. Plus, that work can be done incrementally in small steps in the future if wanted.r? @Zalathar
Unblocks:
//@ no-prefer-dynamic#151691, because without this fix that test fails (see compiletest: Don't look for aux-crate .so if//@ no-prefer-dynamic#151691 (comment))