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re PR c/46015 (-Wunused-but-set-variable warns for arrays used in gotos)

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PR c/46015
	* c-parser.c (c_parser_statement_after_labels): Call mark_exp_read
	on computed goto argument.

	* semantics.c (finish_goto_stmt): Call mark_rvalue_use on computed
	goto destination.

	* c-c++-common/Wunused-var-13.c: New test.

From-SVN: r165643
This commit is contained in:
Jakub Jelinek 2010-10-18 17:55:25 +02:00 • committed by Jakub Jelinek
parent 0f8d623157
commit 84628aa836
6 changed files with 50 additions and 2 deletions
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6
gcc/ChangeLog
View file

@ -1,3 +1,9 @@
2010-10-18 Jakub Jelinek <jakub@redhat.com>
PR c/46015
* c-parser.c (c_parser_statement_after_labels): Call mark_exp_read
on computed goto argument.
2010-10-18 Richard Guenther <rguenther@suse.de>
PR tree-optimization/45967

7
gcc/c-parser.c
View file

@ -4151,9 +4151,12 @@ c_parser_statement_after_labels (c_parser *parser)
}
else if (c_parser_next_token_is (parser, CPP_MULT))
{
tree val;
c_parser_consume_token (parser);
stmt = c_finish_goto_ptr (loc,
c_parser_expression (parser).value);
val = c_parser_expression (parser).value;
mark_exp_read (val);
stmt = c_finish_goto_ptr (loc, val);
}
else
c_parser_error (parser, "expected identifier or %<*%>");

6
gcc/cp/ChangeLog
View file

@ -1,3 +1,9 @@
2010-10-18 Jakub Jelinek <jakub@redhat.com>
PR c/46015
* semantics.c (finish_goto_stmt): Call mark_rvalue_use on computed
goto destination.
2010-10-17 Nicola Pero <nicola.pero@meta-innovation.com>
Merge from apple/trunk branch on FSF servers.

1
gcc/cp/semantics.c
View file

@ -537,6 +537,7 @@ finish_goto_stmt (tree destination)
TREE_USED (destination) = 1;
else
{
destination = mark_rvalue_use (destination);
if (!processing_template_decl)
{
destination = cp_convert (ptr_type_node, destination);

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2010-10-18 Jakub Jelinek <jakub@redhat.com>
PR c/46015
* c-c++-common/Wunused-var-13.c: New test.
2010-10-18 Richard Guenther <rguenther@suse.de>
PR tree-optimization/45967

27
gcc/testsuite/c-c++-common/Wunused-var-13.c Normal file
View file

@ -0,0 +1,27 @@
/* PR c/46015 */
/* { dg-options "-Wunused" } */
/* { dg-do compile } */
int
f1 (int i)
{
static void *labs[2] = { &&lab1, &&lab2 };
goto *(labs[i & 1]);
lab1:
return 1;
lab2:
return 2;
}
int
f2 (int i)
{
void *labs[2] = { &&lab1, &&lab2 };
goto *labs[i & 1];
lab1:
return 1;
lab2:
return 2;
}