Add test case for __has_warning.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141806 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Preprocessor/warning_tests.c b/test/Preprocessor/warning_tests.c
new file mode 100644 (file)
index 0000000..96b96ef
--- /dev/null
+++ b/test/Preprocessor/warning_tests.c
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -fsyntax-only %s -verify
+#ifndef __has_warning
+#error Should have __has_warning
+#endif
+
+#if __has_warning("not valid") // expected-warning {{__has_warning expected option name}}
+#endif
+
+#if __has_warning("-Wparentheses")
+#warning Should have -Wparentheses // expected-warning {{Should have -Wparentheses}}
+#endif
+
+#if __has_warning(-Wfoo) // expected-error {{builtin warning check macro requires a parenthesized string}}
+#endif
+
+#if __has_warning("-Wnot-a-valid-warning-flag-at-all")
+#else
+#warning Not a valid warning flag // expected-warning {{Not a valid warning flag}}
+#endif
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