1 files changed, 18 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/cpp/warn-redefined.c b/gcc/testsuite/gcc.dg/cpp/warn-redefined.c
new file mode 100644
index 000000000..1d3e7fc3e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/cpp/warn-redefined.c
@@ -0,0 +1,18 @@
+// { dg-do preprocess }
+// { dg-options "-std=gnu99 -fdiagnostics-show-option -Wbuiltin-macro-redefined" }
+
+#ifndef __TIME__
+#error "__TIME__ builtin is not defined"
+// { dg-bogus "__TIME__ builtin is not defined" "no-time" { target *-*-* } 5 }
+#endif
+
+#define __TIME__ "X"  // { dg-warning "\"__TIME__\" redefined .-Wbuiltin-macro-redefined." }
+
+#define __TIME__ "Y"  // { dg-bogus "-Wbuiltin-macro-redefined" }
+                      // { dg-warning "\"__TIME__\" redefined" "not-builtin-1" { target *-*-* } 11 }
+                      // { dg-message "previous definition" "previous-1" { target *-*-* } 9 }
+
+#define X "X"
+#define X "Y"         // { dg-bogus "-Wbuiltin-macro-redefined" }
+                      // { dg-warning "\"X\" redefined" "not-builtin-2" { target *-*-* } 16 }
+                      // { dg-message "previous definition" "previous-2" { target *-*-* } 15 }