use cc archiver as default in cc2ar

We should remove entire `cc2ar` but `cc` doesn't seem to cover all the conditions that `cc2ar` handles.
For now, I replaced the `else` logic only, which is a bit hacky and unstable.

Signed-off-by: onur-ozkan <work@onurozkan.dev>

src/bootstrap/src/utils/cc_detect.rs

@@ -29,11 +29,8 @@ use crate::core::config::TargetSelection;
 use crate::utils::exec::{BootstrapCommand, command};
 use crate::{Build, CLang, GitRepo};
 
-// The `cc` crate doesn't provide a way to obtain a path to the detected archiver,
-// so use some simplified logic here. First we respect the environment variable `AR`, then
-// try to infer the archiver path from the C compiler path.
-// In the future this logic should be replaced by calling into the `cc` crate.
-fn cc2ar(cc: &Path, target: TargetSelection) -> Option<PathBuf> {
+/// FIXME(onur-ozkan): This logic should be replaced by calling into the `cc` crate.
+fn cc2ar(cc: &Path, target: TargetSelection, default_ar: PathBuf) -> Option<PathBuf> {
     if let Some(ar) = env::var_os(format!("AR_{}", target.triple.replace('-', "_"))) {
         Some(PathBuf::from(ar))
     } else if let Some(ar) = env::var_os("AR") {
@@ -57,16 +54,7 @@ fn cc2ar(cc: &Path, target: TargetSelection) -> Option<PathBuf> {
     } else if target.contains("android") || target.contains("-wasi") {
         Some(cc.parent().unwrap().join(PathBuf::from("llvm-ar")))
     } else {
-        let parent = cc.parent().unwrap();
-        let file = cc.file_name().unwrap().to_str().unwrap();
-        for suffix in &["gcc", "cc", "clang"] {
-            if let Some(idx) = file.rfind(suffix) {
-                let mut file = file[..idx].to_owned();
-                file.push_str("ar");
-                return Some(parent.join(&file));
-            }
-        }
-        Some(parent.join(file))
+        Some(default_ar)
     }
 }
 
@@ -138,7 +126,7 @@ pub fn find_target(build: &Build, target: TargetSelection) {
     let ar = if let ar @ Some(..) = config.and_then(|c| c.ar.clone()) {
         ar
     } else {
-        cc2ar(compiler.path(), target)
+        cc2ar(compiler.path(), target, PathBuf::from(cfg.get_archiver().get_program()))
     };
 
     build.cc.borrow_mut().insert(target, compiler.clone());