c-common.c (const_strip_array_types): Delete.

	* c-common.c (const_strip_array_types): Delete.
	* c-common.h (const_strip_array_types): Likewise.
	* emit-rtl.c (const_next_insn, const_previous_insn,
	const_next_nonnote_insn, const_prev_nonnote_insn,
	const_next_real_insn, const_prev_real_insn,
	const_next_active_insn, const_prev_active_insn, const_next_label,
	const_prev_label): Delete.
	* gimple-low.c (block_may_fallthru): Use expr_last.
	* jump.c (reversed_comparison_code_parts): Use prev_nonnote_insn.
	* rtl.h (const_previous_insn, const_next_insn,
	const_prev_nonnote_insn, const_next_nonnote_insn,
	const_prev_real_insn, const_next_real_insn,
	const_prev_active_insn, const_next_active_insn, const_prev_label,
	const_next_label): Delete.
	* rtlanal.c (keep_with_call_p): Use next_nonnote_insn.
	* system.h (CONST_CAST): Update comment.
	* tree-cfg.c (tree_can_merge_blocks_p): Use last_stmt.
	(const_first_stmt, const_last_stmt): Delete.
	(tree_block_ends_with_condjump_p): Use last_stmt.
	* tree-flow.h (const_first_stmt, const_last_stmt): Delete.
	* tree-iterator.c (const_expr_first, const_expr_last,
	const_expr_only): Delete.
	* tree.c (const_lookup_attribute): Likewise.
	(attribute_list_contained): Use lookup_attribute.
	* tree.h (const_lookup_attribute, const_expr_first,
	const_expr_last, const_expr_only): Delete.
	
cp:
	* tree.c (pod_type_p, zero_init_p): Use strip_array_types.
	* typeck.c (cp_type_quals, cp_type_readonly, cp_has_mutable_p):
	Likewise.

From-SVN: r128014

1 files changed, 9 insertions, 2 deletions

diff --git a/gcc/system.h b/gcc/system.h
index 0225d8b..84ddf49 100644
--- a/gcc/system.h
+++ b/gcc/system.h
@@ -772,8 +772,15 @@ extern void fancy_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
    the C standard definitions or prototypes force you to.  E.g. if you
    need to free a const object, or if you pass a const string to
    execv, et al.  Another valid use would be in an allocation function
-   that creates const objects that need to be initialized.  Most other
-   cases should be viewed with extreme caution.  */
+   that creates const objects that need to be initialized.  In some
+   cases we have non-const functions that return the argument
+   (e.g. next_nonnote_insn).  Rather than create const shadow
+   functions, we can cast away const-ness in calling these interfaces
+   if we're careful to verify that the called function does indeed not
+   modify its argument and the return value is only used in a const
+   context.  (This can be somewhat dangerous as these assumptions can
+   change after the fact).  Beyond these uses, most other cases of
+   using this macro should be viewed with extreme caution.  */
 
 #if defined(__GNUC__) && GCC_VERSION != 4000
 /* GCC 4.0.x has a bug where it may ICE on this expression.  */