Migrate print-target-list to rmake

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -23,7 +23,6 @@ run-make/no-alloc-shim/Makefile
 run-make/pdb-buildinfo-cl-cmd/Makefile
 run-make/pgo-gen-lto/Makefile
 run-make/pgo-indirect-call-promotion/Makefile
-run-make/print-target-list/Makefile
 run-make/raw-dylib-alt-calling-convention/Makefile
 run-make/raw-dylib-c/Makefile
 run-make/redundant-libs/Makefile

tests/run-make/print-target-list/Makefile

@@ -1,8 +0,0 @@
-include ../tools.mk
-
-# Checks that all the targets returned by `rustc --print target-list` are valid
-# target specifications
-all:
-	for target in $(shell $(BARE_RUSTC) --print target-list); do \
-		$(BARE_RUSTC) --target $$target --print sysroot; \
-	done

tests/run-make/print-target-list/rmake.rs

@@ -0,0 +1,21 @@
+// Checks that all the targets returned by `rustc --print target-list` are valid
+// target specifications
+
+use run_make_support::bare_rustc;
+
+// FIXME(127877): certain experimental targets fail with creating a 'LLVM TargetMachine'
+// in CI, so we skip them
+const EXPERIMENTAL_TARGETS: &[&str] = &["avr", "m68k", "csky", "xtensa"];
+
+fn main() {
+    let targets = bare_rustc().print("target-list").run().stdout_utf8();
+
+    for target in targets.lines() {
+        // skip experimental targets that would otherwise fail
+        if EXPERIMENTAL_TARGETS.iter().any(|experimental| target.contains(experimental)) {
+            continue;
+        }
+
+        bare_rustc().target(target).print("sysroot").run();
+    }
+}