hook up tracing to cg_cranelift
this was easier than expected. here is an example of using RUSTC_LOG with a build of cranelift from rust-lang/rust: ``` $ RUSTC_LOG=rustc_codegen_cranelift cargo +stage1 b Compiling example v0.1.0 (/home/jyn/src/example) INFO rustc_codegen_cranelift codegen crate example INFO rustc_codegen_cranelift codegen crate example Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.44s ```
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@ -27,6 +27,8 @@ extern crate rustc_metadata;
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extern crate rustc_session;
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extern crate rustc_span;
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extern crate rustc_target;
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#[macro_use]
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extern crate tracing;
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// This prevents duplicating functions and statics that are already part of the host rustc process.
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#[allow(unused_extern_crates)]
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@ -208,6 +210,7 @@ impl CodegenBackend for CraneliftCodegenBackend {
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need_metadata_module: bool,
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) -> Box<dyn Any> {
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tcx.dcx().abort_if_errors();
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info!("codegen crate {}", tcx.crate_name(LOCAL_CRATE));
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let config = self.config.clone().unwrap_or_else(|| {
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BackendConfig::from_opts(&tcx.sess.opts.cg.llvm_args)
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.unwrap_or_else(|err| tcx.sess.dcx().fatal(err))
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