copy over `std::path::absolute` instead of adding `canonicalize` hacks

this also fixes a bug where bootstrap would try to use the fake `rustc` binary built by bootstrap -
cargo puts it in a different directory when using `cargo run` instead of x.py

1 files changed, 16 insertions, 0 deletions

diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index c2780a232ed..2ae63858ff6 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -261,6 +261,7 @@ pub struct Build {
     // Properties derived from the above configuration
     src: PathBuf,
     out: PathBuf,
+    bootstrap_out: PathBuf,
     rust_info: channel::GitInfo,
     cargo_info: channel::GitInfo,
     rls_info: channel::GitInfo,
@@ -435,6 +436,20 @@ impl Build {
             .expect("failed to read src/version");
         let version = version.trim();
 
+        let bootstrap_out = if std::env::var("BOOTSTRAP_PYTHON").is_ok() {
+            out.join("bootstrap").join("debug")
+        } else {
+            let workspace_target_dir = std::env::var("CARGO_TARGET_DIR")
+                .map(PathBuf::from)
+                .unwrap_or_else(|_| src.join("target"));
+            let bootstrap_out = workspace_target_dir.join("debug");
+            if !bootstrap_out.join("rustc").exists() {
+                // this restriction can be lifted whenever https://github.com/rust-lang/rfcs/pull/3028 is implemented
+                panic!("run `cargo build --bins` before `cargo run`")
+            }
+            bootstrap_out
+        };
+
         let mut build = Build {
             initial_rustc: config.initial_rustc.clone(),
             initial_cargo: config.initial_cargo.clone(),
@@ -453,6 +468,7 @@ impl Build {
             version: version.to_string(),
             src,
             out,
+            bootstrap_out,
 
             rust_info,
             cargo_info,