tests: add basic test coverage for cli flag --crate-type

Author: jieyouxu

tests/ui/cli/crate-type-flag.empty_crate_type.stderr

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+error: unknown crate type: ``
+

tests/ui/cli/crate-type-flag.rs

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+//! Check that `rustc`'s `--crate-type` flag accepts `--crate-type=<valid_type>` as well as the
+//! multi-value version `--crate-type=<valid_type_1>,<valid_type_2>`.
+//!
+//! This test does not try to check if the output artifacts are valid.
+
+// FIXME(#132309): add a proper `supports-crate-type` directive.
+
+// Single valid crate types should pass
+//@ revisions: lib_ rlib_ staticlib_ dylib_ cdylib_ bin_ proc_macro_
+
+//@[lib_] compile-flags: --crate-type=lib
+//@[lib_] check-pass
+
+//@[rlib_] compile-flags: --crate-type=rlib
+//@[rlib_] check-pass
+
+//@[staticlib_] compile-flags: --crate-type=staticlib
+//@[staticlib_] check-pass
+
+//@[dylib_] ignore-musl (dylibs are not supported)
+//@[dylib_] ignore-wasm (dylibs are not supported)
+//@[dylib_] compile-flags: --crate-type=dylib
+//@[dylib_] check-pass
+
+//@[cdylib_] ignore-musl (cdylibs are not supported)
+//@[cdylib_] compile-flags: --crate-type=cdylib
+//@[cdylib_] check-pass
+
+//@[bin_] compile-flags: --crate-type=bin
+//@[bin_] check-pass
+
+//@[proc_macro_] ignore-wasm (proc-macro is not supported)
+//@[proc_macro_] compile-flags: --crate-type=proc-macro
+//@[proc_macro_] check-pass
+
+//@ revisions: multivalue multivalue_combined
+
+//@[multivalue] compile-flags: --crate-type=lib,rlib,staticlib
+//@[multivalue] check-pass
+
+//@[multivalue_combined] ignore-musl (dylibs are not supported)
+//@[multivalue_combined] ignore-wasm (dylibs are not supported)
+//@[multivalue_combined] compile-flags: --crate-type=lib,rlib,staticlib --crate-type=dylib
+//@[multivalue_combined] check-pass
+
+// `proc-macro` is accepted, but `proc_macro` is not.
+//@ revisions: underscore_proc_macro
+
+//@[underscore_proc_macro] compile-flags: --crate-type=proc_macro
+//@[underscore_proc_macro] error-pattern: "unknown crate type: `proc_macro`"
+
+// Empty `--crate-type` not accepted.
+//@ revisions: empty_crate_type
+//@[empty_crate_type] compile-flags: --crate-type=
+//@[empty_crate_type] error-pattern: "unknown crate type: ``"
+
+fn main() {}

tests/ui/cli/crate-type-flag.underscore_proc_macro.stderr

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+error: unknown crate type: `proc_macro`
+