rustbuild: include channel in sanitizers installed name

Allows parallel install of different rust channels

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

src/bootstrap/native.rs

@@ -571,7 +571,7 @@ impl Step for Sanitizers {
         }
 
         let out_dir = builder.native_dir(self.target).join("sanitizers");
-        let runtimes = supported_sanitizers(&out_dir, self.target);
+        let runtimes = supported_sanitizers(&out_dir, self.target, &builder.config.channel);
         if runtimes.is_empty() {
             return runtimes;
         }
@@ -635,7 +635,11 @@ pub struct SanitizerRuntime {
 }
 
 /// Returns sanitizers available on a given target.
-fn supported_sanitizers(out_dir: &Path, target: Interned<String>) -> Vec<SanitizerRuntime> {
+fn supported_sanitizers(
+    out_dir: &Path,
+    target: Interned<String>,
+    channel: &str,
+) -> Vec<SanitizerRuntime> {
     let mut result = Vec::new();
     match &*target {
         "x86_64-apple-darwin" => {
@@ -644,7 +648,7 @@ fn supported_sanitizers(out_dir: &Path, target: Interned<String>) -> Vec<Sanitiz
                     cmake_target: format!("clang_rt.{}_osx_dynamic", s),
                     path: out_dir
                         .join(&format!("build/lib/darwin/libclang_rt.{}_osx_dynamic.dylib", s)),
-                    name: format!("librustc_rt.{}.dylib", s),
+                    name: format!("librustc-{}_rt.{}.dylib", channel, s),
                 });
             }
         }
@@ -653,7 +657,7 @@ fn supported_sanitizers(out_dir: &Path, target: Interned<String>) -> Vec<Sanitiz
                 result.push(SanitizerRuntime {
                     cmake_target: format!("clang_rt.{}-x86_64", s),
                     path: out_dir.join(&format!("build/lib/linux/libclang_rt.{}-x86_64.a", s)),
-                    name: format!("librustc_rt.{}.a", s),
+                    name: format!("librustc-{}_rt.{}.a", channel, s),
                 });
             }
         }
@@ -662,7 +666,7 @@ fn supported_sanitizers(out_dir: &Path, target: Interned<String>) -> Vec<Sanitiz
                 result.push(SanitizerRuntime {
                     cmake_target: format!("clang_rt.{}-x86_64", s),
                     path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-x86_64.a", s)),
-                    name: format!("librustc_rt.{}.a", s),
+                    name: format!("librustc-{}_rt.{}.a", channel, s),
                 });
             }
         }
@@ -671,7 +675,7 @@ fn supported_sanitizers(out_dir: &Path, target: Interned<String>) -> Vec<Sanitiz
                 result.push(SanitizerRuntime {
                     cmake_target: format!("clang_rt.{}-aarch64", s),
                     path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-aarch64.a", s)),
-                    name: format!("librustc_rt.{}.a", s),
+                    name: format!("librustc-{}_rt.{}.a", channel, s),
                 });
             }
         }

src/librustc_codegen_ssa/back/link.rs

@@ -765,20 +765,23 @@ fn link_sanitizer_runtime(sess: &Session, crate_type: config::CrateType, linker:
     let default_sysroot = filesearch::get_or_default_sysroot();
     let default_tlib =
         filesearch::make_target_lib_path(&default_sysroot, sess.opts.target_triple.triple());
+    let channel = option_env!("CFG_RELEASE_CHANNEL")
+        .map(|channel| format!("-{}", channel))
+        .unwrap_or_default();
 
     match sess.opts.target_triple.triple() {
         "x86_64-apple-darwin" => {
             // On Apple platforms, the sanitizer is always built as a dylib, and
             // LLVM will link to `@rpath/*.dylib`, so we need to specify an
             // rpath to the library as well (the rpath should be absolute, see
             // PR #41352 for details).
-            let libname = format!("rustc_rt.{}", name);
+            let libname = format!("rustc{}_rt.{}", channel, name);
             let rpath = default_tlib.to_str().expect("non-utf8 component in path");
             linker.args(&["-Wl,-rpath".into(), "-Xlinker".into(), rpath.into()]);
             linker.link_dylib(Symbol::intern(&libname));
         }
         "x86_64-unknown-linux-gnu" | "x86_64-fuchsia" | "aarch64-fuchsia" => {
-            let filename = format!("librustc_rt.{}.a", name);
+            let filename = format!("librustc{}_rt.{}.a", channel, name);
             let path = default_tlib.join(&filename);
             linker.link_whole_rlib(&path);
         }

src/librustc_codegen_ssa/build.rs

@@ -0,0 +1,4 @@
+fn main() {
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-env-changed=CFG_RELEASE_CHANNEL");
+}