Rollup merge of #68994 - Keruspe:sanitizers-conflict, r=Mark-Simulacrum

rustbuild: include channel in sanitizers installed name

Allows parallel install of different rust channels.

I'm not sure if the channel is the right thing to use there, but currently both beta and nightly try to install e.g. `/usr/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_rt.asan.a` when before (and in current stable) it used to be `/usr/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_asan-45a4390180e83d28.rlib` which contained a hash, making it unique.
With this patch, `/usr/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc-nightly_rt.asan.a` gets installed

2 files changed, 9 insertions, 2 deletions

diff --git a/src/librustc_codegen_ssa/back/link.rs b/src/librustc_codegen_ssa/back/link.rs
index d3b8f7ea33f..aaa4448fc19 100644
--- a/src/librustc_codegen_ssa/back/link.rs
+++ b/src/librustc_codegen_ssa/back/link.rs
@@ -765,6 +765,9 @@ 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" => {
@@ -772,13 +775,13 @@ fn link_sanitizer_runtime(sess: &Session, crate_type: config::CrateType, linker:
             // 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);
         }
diff --git a/src/librustc_codegen_ssa/build.rs b/src/librustc_codegen_ssa/build.rs
new file mode 100644
index 00000000000..ea2af6e192e
--- /dev/null
+++ b/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");
+}