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-rw-r--r--crates/project_model/src/cargo_workspace.rs32
1 files changed, 30 insertions, 2 deletions
diff --git a/crates/project_model/src/cargo_workspace.rs b/crates/project_model/src/cargo_workspace.rs
index 894c5c952..91fb645da 100644
--- a/crates/project_model/src/cargo_workspace.rs
+++ b/crates/project_model/src/cargo_workspace.rs
@@ -16,6 +16,7 @@ use paths::{AbsPath, AbsPathBuf};
16use rustc_hash::FxHashMap; 16use rustc_hash::FxHashMap;
17 17
18use crate::cfg_flag::CfgFlag; 18use crate::cfg_flag::CfgFlag;
19use crate::utf8_stdout;
19 20
20/// `CargoWorkspace` represents the logical structure of, well, a Cargo 21/// `CargoWorkspace` represents the logical structure of, well, a Cargo
21/// workspace. It pretty closely mirrors `cargo metadata` output. 22/// workspace. It pretty closely mirrors `cargo metadata` output.
@@ -166,8 +167,35 @@ impl CargoWorkspace {
166 if let Some(parent) = cargo_toml.parent() { 167 if let Some(parent) = cargo_toml.parent() {
167 meta.current_dir(parent.to_path_buf()); 168 meta.current_dir(parent.to_path_buf());
168 } 169 }
169 if let Some(target) = config.target.as_ref() { 170 let target = if let Some(target) = config.target.as_ref() {
170 meta.other_options(vec![String::from("--filter-platform"), target.clone()]); 171 Some(target.clone())
172 } else {
173 // cargo metadata defaults to giving information for _all_ targets.
174 // In the absence of a preference from the user, we use the host platform.
175 let mut rustc = Command::new(toolchain::rustc());
176 rustc.current_dir(cargo_toml.parent().unwrap()).arg("-vV");
177 log::debug!("Discovering host platform by {:?}", rustc);
178 match utf8_stdout(rustc) {
179 Ok(stdout) => {
180 let field = "host: ";
181 let target =
182 stdout.lines().find(|l| l.starts_with(field)).map(|l| &l[field.len()..]);
183 if let Some(target) = target {
184 Some(target.to_string())
185 } else {
186 // If we fail to resolve the host platform, it's not the end of the world.
187 log::info!("rustc -vV did not report host platform, got:\n{}", stdout);
188 None
189 }
190 }
191 Err(e) => {
192 log::warn!("Failed to discover host platform: {}", e);
193 None
194 }
195 }
196 };
197 if let Some(target) = target {
198 meta.other_options(vec![String::from("--filter-platform"), target]);
171 } 199 }
172 let mut meta = meta.exec().with_context(|| { 200 let mut meta = meta.exec().with_context(|| {
173 format!("Failed to run `cargo metadata --manifest-path {}`", cargo_toml.display()) 201 format!("Failed to run `cargo metadata --manifest-path {}`", cargo_toml.display())