Improved checking of target's llvm_config

Point llvm @bitshifter branch until PR accepted

Use today's date for LLVM auto clean trigger

Update LLVM submodule to point at rust-lang fork.

Handle case when target is set

1 files changed, 1 insertions, 1 deletions

diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index 9e1ee7ccd1e..155848901cd 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -199,7 +199,7 @@ pub fn rustc<'a>(build: &'a Build, target: &str, compiler: &Compiler<'a>) {
         cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
     }
     // Flag that rust llvm is in use
-    if build.config.target_config.get(target).is_none() {
+    if build.is_rust_llvm(target) {
         cargo.env("LLVM_RUSTLLVM", "1");
     }
     cargo.env("LLVM_CONFIG", build.llvm_config(target));