Add a proper test for -Wsystem-headers

This will be extended as we fix issues in the current implementation.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@200054 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Headers/warn-sysheader.cpp b/test/Headers/warn-sysheader.cpp
new file mode 100644 (file)
index 0000000..dbc3825
--- /dev/null
+++ b/test/Headers/warn-sysheader.cpp
@@ -0,0 +1,33 @@
+// Test that -Wsystem-headers works with default and custom mappings like -Werror.
+// Keep run lines at the bottom for line number stability.
+
+#ifdef IS_SYSHEADER
+#pragma clang system_header
+
+int f() { return (int)0; } // Use the old-style-cast warning as an arbitrary "ordinary" diagnostic for the purpose of testing.
+
+#warning "custom message"
+
+#if defined(A) || defined(B)
+// expected-warning@9 {{"custom message"}}
+#elif defined(C)
+// expected-warning@7 {{use of old-style cast}}
+// expected-warning@9 {{"custom message"}}
+#elif defined(D)
+// expected-error@7 {{use of old-style cast}}
+// expected-error@9 {{"custom message"}}
+#elif defined(E)
+// expected-error@7 {{use of old-style cast}}
+// expected-warning@9 {{"custom message"}}
+#endif
+
+#else
+#define IS_SYSHEADER
+#include __FILE__
+#endif
+
+// RUN: %clang_cc1 -verify -fsyntax-only -DA %s
+// RUN: %clang_cc1 -verify -fsyntax-only -DB -Wold-style-cast %s
+// RUN: %clang_cc1 -verify -fsyntax-only -DC -Wold-style-cast -Wsystem-headers %s
+// RUN: %clang_cc1 -verify -fsyntax-only -DD -Wold-style-cast -Wsystem-headers -Werror %s
+// RUN: %clang_cc1 -verify -fsyntax-only -DE -Wold-style-cast -Wsystem-headers -Werror=old-style-cast %s