Decouple proc_macro from the rest of the compiler.#49219

Merged

bors merged 16 commits intorust-lang:masterfrom

eddyb:proc-macro-decouple

Nov 30, 2018

Commits on Nov 30, 2018

proc_macro: introduce a "bridge" between clients (proc macros) and servers (compiler front-ends).
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proc_macro: remove the __internal module.
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proc_macro: move the rustc server to syntax_ext.
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proc_macro: move to a dependency of libtest.
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Statically link proc_macro into proc macros.
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tests: remove ignore-stage1 where possible in proc_macro tests.
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tests: move all proc_macro tests from -fulldeps.
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tests: use `force-host` and `no-prefer-dynamic` in all proc_macro tests.
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bootstrap: ensure that `libproc_macro` is available on the host for tests even when cross-compiling.
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tests: support cross-compilation in run-make/rustc-macro-dep-files.
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bootstrap: don't use libraries from MUSL_ROOT on non-musl targets.
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tests: use a #![no_std] target crate in run-make/rustc-macro-dep-files.
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compiletest: don't pass -Clinker when `// force-host` was requested.
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tests: use alloc instead of libc in unnecessary-extern-crate, to make it work on wasm.
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tests: ignore wasm32 for run-pass/proc-macro/expand-with-a-macro.
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bootstrap: provide host `rust_test_helpers` to compiletest, not just target.
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