1 files changed, 15 insertions, 0 deletions
diff --git a/third_party/rust/cc/tests/cxxflags.rs b/third_party/rust/cc/tests/cxxflags.rs
new file mode 100644
index 0000000000..c524c7da4e
--- /dev/null
+++ b/third_party/rust/cc/tests/cxxflags.rs
@@ -0,0 +1,15 @@
+mod support;
+
+use crate::support::Test;
+use std::env;
+
+/// This test is in its own module because it modifies the environment and would affect other tests
+/// when run in parallel with them.
+#[test]
+fn gnu_no_warnings_if_cxxflags() {
+    env::set_var("CXXFLAGS", "-arbitrary");
+    let test = Test::gnu();
+    test.gcc().file("foo.cpp").cpp(true).compile("foo");
+
+    test.cmd(0).must_not_have("-Wall").must_not_have("-Wextra");
+}