syshdr.c: New test.

* gcc.dg/cpp/syshdr.c: New test.
	* gcc.dg/cpp/syshdr1.h, gcc.dg/cpp/syshdr2.h: New files.

From-SVN: r35099

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2000-07-17  Zack Weinberg  <zack@wolery.cumb.org>
+
+	* gcc.dg/cpp/syshdr.c: New test.
+	* gcc.dg/cpp/syshdr1.h, gcc.dg/cpp/syshdr2.h: New files.
+
 2000-07-17  Neil Booth  <neilb@earthling.net>
 
 	* gcc.dg/cpp/cmdlne-dM.c: New test.

gcc/testsuite/gcc.dg/cpp/syshdr.c

@@ -0,0 +1,12 @@
+/* Test for proper suppression of warnings in system headers,
+   and only in system headers.  */
+/* FRAGILITY WARNING: The only way we have to distinguish the good error
+   from the bad error is that the good error is on line 4 and the bad is
+   on line 5 (of their respective files).  dg.exp doesn't have any way to
+   condition error matchers on the file they're in.  */
+
+/* { dg-do preprocess } */
+/* { dg-error "include_next" "good error" { target *-*-* } 4 } */
+
+#include "syshdr1.h"  /* { dg-error "" "In file included from:" } */
+#include "syshdr2.h"

gcc/testsuite/gcc.dg/cpp/syshdr1.h

@@ -0,0 +1,4 @@
+/* This file should generate an error because #include_next is not a
+   standard directive.  */
+
+#include_next <stdio.h>

gcc/testsuite/gcc.dg/cpp/syshdr2.h

@@ -0,0 +1,5 @@
+/* This file would generate an error because of #include_next, but the
+   #pragma marks it a system header, so the error is suppressed.  */
+
+#pragma GCC system_header
+#include_next <stdio.h>