clean up error codes explanation

[rust.git] / src / bootstrap / builder.rs

diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index a2dca66697d6d641b971ae43700ebdf70e03ee1b..00c8e72a8f6851c82c68a4f0cd2925d8fd3ed584 100644 (file)
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -343,6 +343,7 @@ macro_rules! describe {
                 tool::Rustdoc,
                 tool::Clippy,
                 native::Llvm,
+                native::Sanitizers,
                 tool::Rustfmt,
                 tool::Miri,
                 native::Lld
@@ -726,7 +727,7 @@ pub fn cargo(
             self.clear_if_dirty(&my_out, &rustdoc);
         }
 
-        cargo.env("CARGO_TARGET_DIR", out_dir).arg(cmd).arg("-Zconfig-profile");
+        cargo.env("CARGO_TARGET_DIR", &out_dir).arg(cmd).arg("-Zconfig-profile");
 
         let profile_var = |name: &str| {
             let profile = if self.config.rust_optimize { "RELEASE" } else { "DEV" };
@@ -865,6 +866,18 @@ pub fn cargo(
         let sysroot = if use_snapshot { self.rustc_snapshot_sysroot() } else { &maybe_sysroot };
         let libdir = self.rustc_libdir(compiler);
 
+        // Clear the output directory if the real rustc we're using has changed;
+        // Cargo cannot detect this as it thinks rustc is bootstrap/debug/rustc.
+        //
+        // Avoid doing this during dry run as that usually means the relevant
+        // compiler is not yet linked/copied properly.
+        //
+        // Only clear out the directory if we're compiling std; otherwise, we
+        // should let Cargo take care of things for us (via depdep info)
+        if !self.config.dry_run && mode == Mode::ToolStd && cmd == "build" {
+            self.clear_if_dirty(&out_dir, &self.rustc(compiler));
+        }
+
         // Customize the compiler we're running. Specify the compiler to cargo
         // as our shim and then pass it some various options used to configure
         // how the actual compiler itself is called.
@@ -1183,6 +1196,21 @@ pub fn cargo(
             rustflags.arg("-Cprefer-dynamic");
         }
 
+        // When building incrementally we default to a lower ThinLTO import limit
+        // (unless explicitly specified otherwise). This will produce a somewhat
+        // slower code but give way better compile times.
+        {
+            let limit = match self.config.rust_thin_lto_import_instr_limit {
+                Some(limit) => Some(limit),
+                None if self.config.incremental => Some(10),
+                _ => None,
+            };
+
+            if let Some(limit) = limit {
+                rustflags.arg(&format!("-Cllvm-args=-import-instr-limit={}", limit));
+            }
+        }
+
         Cargo { command: cargo, rustflags }
     }