Add is_linux and llvm_components_contain to run-make-support

Author: Rejyr

src/tools/run-make-support/src/lib.rs

@@ -74,6 +74,12 @@ pub fn ar(inputs: &[impl AsRef<Path>], output_path: impl AsRef<Path>) {
     }
 }
 
+/// Check if target is linux-like.
+#[must_use]
+pub fn is_linux() -> bool {
+    target().contains("linux")
+}
+
 /// Check if target is windows-like.
 #[must_use]
 pub fn is_windows() -> bool {
@@ -92,6 +98,13 @@ pub fn is_darwin() -> bool {
     target().contains("darwin")
 }
 
+/// Check if `component` is within `LLVM_COMPONENTS`
+#[must_use]
+pub fn llvm_components_contain(component: &str) -> bool {
+    // `LLVM_COMPONENTS` is a space-separated list of words
+    env_var("LLVM_COMPONENTS").split_whitespace().find(|s| s == &component).is_some()
+}
+
 #[track_caller]
 #[must_use]
 pub fn python_command() -> Command {