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Don't build dependencies when retrieving target data layout

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`cargo rustc -- <args>` first builds dependencies then calls `rustc <args>` for the current package. Here, we don't want to build dependencies, we just want to call `rustc --print`. An unstable `cargo rustc` `--print` command bypasses building dependencies first. This speeds up execution of this code path and ensures RA doesn't recompile dependencies with the `RUSTC_BOOTSRAP=1` env var flag set.

Note that we must pass `-Z unstable-options` twice, first to enable the `cargo` unstable `--print` flag, then later to enable the unstable `rustc` `target-spec-json` print request.
This commit is contained in:
Chase Douglas 2024-02-20 16:49:07 -08:00
parent 344a79c17d
commit 2826eb51aa
1 changed files with 10 additions and 1 deletions
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11
crates/project-model/src/target_data_layout.rs
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@ -32,7 +32,16 @@ pub fn get(
Sysroot::set_rustup_toolchain_env(&mut cmd, sysroot);
cmd.envs(extra_env);
cmd.current_dir(cargo_toml.parent())
.args(["rustc", "--", "-Z", "unstable-options", "--print", "target-spec-json"])
.args([
"rustc",
"-Z",
"unstable-options",
"--print",
"target-spec-json",
"--",
"-Z",
"unstable-options",
])
.env("RUSTC_BOOTSTRAP", "1");
if let Some(target) = target {
cmd.args(["--target", target]);