feat(bootstrap): update wasm sanity check to use cc::Tool::is_like_clang

Author: JayAndJef

src/bootstrap/src/core/sanity.rs

@@ -319,7 +319,7 @@ than building it.
             && (build.config.optimized_compiler_builtins(*target)
                 || build.config.rust_std_features.contains("compiler-builtins-c"))
         {
-            let is_clang = is_clang_compiler(build.cc(*target), build);
+            let is_clang = build.cc_tool(*target).is_like_clang();
             if !is_clang {
                 panic!("only clang supports building c code for wasm targets");
             }
@@ -387,17 +387,3 @@ $ pacman -R cmake && pacman -S mingw-w64-x86_64-cmake
         cmd_finder.must_have(s);
     }
 }
-
-/// checks if the compiler at `path` is clang by looking at defined macros
-fn is_clang_compiler(path: PathBuf, build: &Build) -> bool {
-    let cc_output = command(&path)
-        .allow_failure()
-        .arg("-E") // preprocess only
-        .arg("-dM") // dump defines
-        .arg("-x")
-        .arg("c")
-        .arg("/dev/null")
-        .run_capture_stdout(build)
-        .stdout();
-    cc_output.contains("#define __clang__ 1")
-}

src/bootstrap/src/lib.rs

@@ -27,6 +27,7 @@ use std::{env, fs, io, str};
 
 use build_helper::ci::gha;
 use build_helper::exit;
+use cc::Tool;
 use termcolor::{ColorChoice, StandardStream, WriteColor};
 use utils::build_stamp::BuildStamp;
 use utils::channel::GitInfo;
@@ -1198,6 +1199,11 @@ Executed at: {executed_at}"#,
         self.cc.borrow()[&target].path().into()
     }
 
+    /// Returns the internal `cc::Tool`
+    fn cc_tool(&self, target: TargetSelection) -> Tool {
+        self.cc.borrow()[&target].clone()
+    }
+
     /// Returns C flags that `cc-rs` thinks should be enabled for the
     /// specified target by default.
     fn cc_handled_clags(&self, target: TargetSelection, c: CLang) -> Vec<String> {