Implement -Wdate-time preprocessor warning
This GCC warning is useful for validating reproducible builds
and might help when tracking down issues with modules too.
llvm-svn: 210511
diff --git a/clang/test/Lexer/warn-date-time.c b/clang/test/Lexer/warn-date-time.c
new file mode 100644
index 0000000..3899933
--- /dev/null
+++ b/clang/test/Lexer/warn-date-time.c
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -Wdate-time -Wno-builtin-macro-redefined %s -verify -E
+
+__TIME__ // expected-warning {{expansion of date or time macro is not reproducible}}
+__DATE__ // expected-warning {{expansion of date or time macro is not reproducible}}
+__TIMESTAMP__ // expected-warning {{expansion of date or time macro is not reproducible}}
+
+#define __TIME__
+__TIME__