* cpp.texi: Update for handling of charconsts.

	* cpplex.c (maybe_read_ucs): Don't accept D800-DFFF.  Update
	diagnostics.  Skip to the end if the UCS is too short.
	(cpp_interpret_charconst): Long charconsts issue a warning
	not an error.

	* gcc.dg/cpp/charconst.c: New tests.
	* gcc.dg/cpp/escape.c: New tests.
	* gcc.dg/cpp/escape-1.c: New tests.
	* gcc.dg/cpp/escape-2.c: New tests.
	* gcc.dg/cpp/ucs.c: New tests.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@42514 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 33 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/cpp/charconst.c b/gcc/testsuite/gcc.dg/cpp/charconst.c
new file mode 100644
index 00000000000..d8a178b7a9f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/cpp/charconst.c
@@ -0,0 +1,33 @@
+/* Copyright (C) 2001 Free Software Foundation, Inc.  */
+
+/* { dg-do compile } */
+
+/* This tests various diagnostics about character constants, for both
+   the preprocessor and the compiler.
+
+   Neil Booth, 22 May 2001.  */
+
+#if ''			/* { dg-warning "empty" "empty charconst" } */
+#endif
+#if L''			/* { dg-warning "empty" "empty wide charconst" } */
+#endif
+#if 'very long'		/* { dg-warning "too long" "long charconst" } */
+#endif
+#if L'very long'	/* { dg-warning "too long" "long wide charconst" } */
+#endif
+/* Don't do this test for L'ab'; it depends upon sizeof (wchar_t).  */
+#if 'ab'		/* { dg-warning "multi-char" "multi-character" } */
+#endif
+
+void foo ()
+{
+  int c = '';		/* { dg-warning "empty" "empty charconst" } */
+  c = L'';		/* { dg-warning "empty" "empty wide charconst" } */
+
+  c = 'very long';	/* { dg-warning "too long" "long charconst" } */
+  c = L'very long';	/* { dg-warning "too long" "long wide charconst" } */
+
+  /* Don't do this test for L'ab'; it depends upon sizeof (wchar_t).  */
+  c = 'ab';		/* { dg-warning "multi-char" "multi-character" } */
+ 
+}