diff --git a/lldb/packages/Python/lldbsuite/test/decorators.py b/lldb/packages/Python/lldbsuite/test/decorators.py
index 34319e203a317..0bb9ab9f5f892 100644
--- a/lldb/packages/Python/lldbsuite/test/decorators.py
+++ b/lldb/packages/Python/lldbsuite/test/decorators.py
@@ -989,13 +989,16 @@ def skipUnlessAArch64MTELinuxCompiler(func):
 
     def is_toolchain_with_mte():
         compiler_path = lldbplatformutil.getCompiler()
-        compiler = os.path.basename(compiler_path)
-        f = tempfile.NamedTemporaryFile()
+        f = tempfile.NamedTemporaryFile(delete=False)
         if lldbplatformutil.getPlatform() == "windows":
             return "MTE tests are not compatible with 'windows'"
 
-        cmd = "echo 'int main() {}' | %s -x c -o %s -" % (compiler_path, f.name)
-        if os.popen(cmd).close() is not None:
+        # Note hostos may be Windows.
+        f.close()
+
+        cmd = f"{compiler_path} -x c -o {f.name} -"
+        if subprocess.run(cmd, input="int main() {}".encode()).returncode != 0:
+            os.remove(f.name)
             # Cannot compile at all, don't skip the test
             # so that we report the broken compiler normally.
             return None
@@ -1010,12 +1013,10 @@ def is_toolchain_with_mte():
             int main() {
                 void* ptr = __arm_mte_create_random_tag((void*)(0), 0);
             }"""
-        cmd = "echo '%s' | %s -march=armv8.5-a+memtag -x c -o %s -" % (
-            test_src,
-            compiler_path,
-            f.name,
-        )
-        if os.popen(cmd).close() is not None:
+        cmd = f"{compiler_path} -march=armv8.5-a+memtag -x c -o {f.name} -"
+        res = subprocess.run(cmd, input=test_src.encode())
+        os.remove(f.name)
+        if res.returncode != 0:
             return "Toolchain does not support MTE"
         return None