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-rw-r--r--third_party/rust/libc/tests/const_fn.rs5
1 files changed, 5 insertions, 0 deletions
diff --git a/third_party/rust/libc/tests/const_fn.rs b/third_party/rust/libc/tests/const_fn.rs
new file mode 100644
index 0000000000..0e7e1864b9
--- /dev/null
+++ b/third_party/rust/libc/tests/const_fn.rs
@@ -0,0 +1,5 @@
+#![cfg(libc_const_extern_fn)] // If this does not hold, the file is empty
+
+#[cfg(target_os = "linux")]
+const _FOO: libc::c_uint = unsafe { libc::CMSG_SPACE(1) };
+//^ if CMSG_SPACE is not const, this will fail to compile