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Auto merge of #77975 - bjorn3:cg_clif_subtree3, r=Mark-Simulacrum

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Add cg_clif as optional codegen backend

Rustc_codegen_cranelift is an alternative codegen backend for rustc based on Cranelift. It has the potential to improve compilation times in debug mode. In my experience the compile time improvements over debug mode LLVM for a clean build are about 20-30% in most cases.

This PR adds cg_clif as optional codegen backend. By default it is only enabled for `./x.py check`. It can be enabled for `./x.py build` too by adding `cranelift` to the `rust.codegen-backends` array in `config.toml`.

MCP: https://github.com/rust-lang/compiler-team/issues/270

r? `@Mark-Simulacrum`
This commit is contained in:
bors 2020-10-26 16:31:38 +00:00
commit 35debd4c11
98 changed files with 17049 additions and 39 deletions
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8
src/bootstrap/bootstrap.py
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@ -969,8 +969,12 @@ class RustBuild(object):
# the rust git repository is updated. Normal development usually does
# not use vendoring, so hopefully this isn't too much of a problem.
if self.use_vendored_sources and not os.path.exists(vendor_dir):
run([self.cargo(), "vendor", "--sync=./src/tools/rust-analyzer/Cargo.toml"],
verbose=self.verbose, cwd=self.rust_root)
run([
self.cargo(),
"vendor",
"--sync=./src/tools/rust-analyzer/Cargo.toml",
"--sync=./compiler/rustc_codegen_cranelift/Cargo.toml",
], verbose=self.verbose, cwd=self.rust_root)
def bootstrap(help_triggered):