1 files changed, 56 insertions, 0 deletions
diff --git a/test/Sema/warn-extern-main.c b/test/Sema/warn-extern-main.c
new file mode 100644
index 000000000000..62c2c9b4a86c
--- /dev/null
+++ b/test/Sema/warn-extern-main.c
@@ -0,0 +1,56 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST1
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST2
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST3
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST4
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST5
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST6
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST7
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST8
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST9 -ffreestanding
+
+#if TEST1
+int main; // expected-warning{{variable named 'main' with external linkage has undefined behavior}}
+
+#elif TEST2
+extern int main; // expected-warning{{variable named 'main' with external linkage has undefined behavior}}
+
+#elif TEST3
+// expected-no-diagnostics
+void x() {
+  static int main;
+}
+
+#elif TEST4
+void x() {
+  extern int main; // expected-warning{{variable named 'main' with external linkage has undefined behavior}}
+}
+
+#elif TEST5
+// expected-no-diagnostics
+void x() {
+  int main;
+}
+
+#elif TEST6
+// expected-no-diagnostics
+static int main;
+
+#elif TEST7
+// expected-no-diagnostics
+void x() {
+  auto int main;
+}
+
+#elif TEST8
+// expected-no-diagnostics
+void x() {
+  register int main;
+}
+
+#elif TEST9
+// expected-no-diagnostics
+int main;
+
+#else
+#error Unknown Test
+#endif