Update cc crate to 1.0.40

This change updates the cc crate to version 1.0.40.

Import subrepo cc/:cc at 6ad3da7558ec3ccb4dc9c2ed1487fc139469d41e

1 files changed, 18 insertions, 0 deletions

diff --git a/cc/tests/cflags.rs b/cc/tests/cflags.rs
new file mode 100644
index 0000000..df6b0a7
--- /dev/null
+++ b/cc/tests/cflags.rs
@@ -0,0 +1,18 @@
+extern crate cc;
+extern crate tempdir;
+
+mod support;
+
+use std::env;
+use support::Test;
+
+/// 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_cflags() {
+    env::set_var("CFLAGS", "-arbitrary");
+    let test = Test::gnu();
+    test.gcc().file("foo.c").compile("foo");
+
+    test.cmd(0).must_not_have("-Wall").must_not_have("-Wextra");
+}