PR c++/19542

        * c-common.c (c_common_nodes_and_builtins): Create global null_node.
        (warn_strict_null_sentinel): Define.
        (check_function_sentinel): Check for null_node as valid sentinel too.
        * c-common.h (c_tree_index): Added CTI_NULL.
        (null_node) Define global_tree[CTI_NULL].
        (warn_strict_null_sentinel): Declare.
        * c-opts.c: (c_common_handle_option): Handle -Wstrict-null-sentinel.
        * c.opt: (Wstrict-null-sentinel): New C++ option.
        * doc/invoke.texi (C++ Options): Document -Wstrict-null-sentinel.

        * cp-tree.h (cp_tree_index): Remove CPTI_NULL, to be defined in C
        common frontend.
        (null_node): Remove.
        * lex.c (cxx_init): Move null_node initialisation to C common frontend.

        * g++.dg/warn/sentinel.C: New testcase for __null sentinels added.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@99091 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 4 insertions, 0 deletions

diff --git a/gcc/c-opts.c b/gcc/c-opts.c
index 4ac8e9d4395..ebf23e571d7 100644
--- a/gcc/c-opts.c
+++ b/gcc/c-opts.c
@@ -477,6 +477,10 @@ c_common_handle_option (size_t scode, const char *arg, int value)
       warn_return_type = value;
       break;
 
+    case OPT_Wstrict_null_sentinel:
+      warn_strict_null_sentinel = value;
+      break;
+
     case OPT_Wsystem_headers:
       cpp_opts->warn_system_headers = value;
       break;