--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/cpp/unc4.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,39 @@
+/* { dg-do preprocess } */
+
+/* Tests for un-terminated conditional diagnostics.
+   Copyright (c) 1999 Free Software Foundation.
+   Contributed by Zack Weinberg, who made it up all by himself.  */
+
+#endif /* { dg-error "#endif" "#endif without #if" } */
+
+#else  /* { dg-error "#else" "#else without #if" } */
+#endif /* { dg-error "#endif" "#endif after #else without #if" } */
+
+#elif 0 /* { dg-error "#elif" "#elif without #if" } */
+#endif  /* { dg-error "#endif" "#endif after #else without #if" } */
+
+#if 1  /* { dg-bogus "unterminated" "terminated true conditional" } */
+blah
+#endif
+
+#if 0  /* { dg-bogus "unterminated" "terminated false conditional" } */
+ignored
+#endif
+
+/* We shouldn't see unbalanced conditionals inside #if'ed out #includes.  */
+#if 0
+#include "unc1.c"
+#endif
+
+/* The ifdef below should not get an error just because there's a bad if
+   inside the included file.  
+   The odd dg-error tag on the include matches the "In file included from"
+   message.  */
+#define FOO
+#ifdef FOO  /* { dg-bogus "unterminated" "nested unterm" } */
+#include "unc1.c"  /* { dg-message "file included from" "" { target *-*-* } 0 } */
+#endif
+
+/* dg.exp doesn't read the included files for tags, so we have to
+   do them explicitly here.  */
+/* { dg-error "#if" "unc1.c: unterminated #if" { target *-*-* } 4 } */