Fix CUDA build with clang++. (#1273)

Author: dot-asm

.github/workflows/main.yml

@@ -253,6 +253,7 @@ jobs:
         shell: bash
         run: |
           PATH="/usr/local/cuda/bin:$PATH" cargo test --manifest-path dev-tools/cc-test/Cargo.toml --features test_cuda
+          PATH="/usr/local/cuda/bin:$PATH" CXX=clang++ cargo test --manifest-path dev-tools/cc-test/Cargo.toml --features test_cuda
 
   msrv:
     name: MSRV

src/lib.rs

@@ -2093,7 +2093,7 @@ impl Build {
 
                     // Pass `--target` with the LLVM target to properly
                     // configure Clang even when cross-compiling.
-                    cmd.args.push(format!("--target={llvm_target}").into());
+                    cmd.push_cc_arg(format!("--target={llvm_target}").into());
                 }
             }
             ToolFamily::Msvc { clang_cl } => {