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[C++0x] pedantic warning with 'alignof(expression)'
- From: Rodrigo Rivas <rodrigorivascosta at gmail dot com>
- To: gcc-patches at gcc dot gnu dot org, Jason Merrill <jason at redhat dot com>
- Date: Sun, 14 Nov 2010 13:12:28 +0100
- Subject: [C++0x] pedantic warning with 'alignof(expression)'
Hi!
I've noticed that the C++0x draft does not allow to use the 'alignof'
operator with an expression, only with a type.
However, the GCC implementation allows both, because it is identical
to '__alignof__' and it is implemented analogous to 'sizeof'.
I think that a pedantic warning is in order. The attached patch adds it.
Regards.
Rodrigo
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 906b0c3..7e544cf 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -5912,7 +5912,16 @@ cp_parser_unary_expression (cp_parser *parser,
bool address_p, bool cast_p,
if (TYPE_P (operand))
return cxx_sizeof_or_alignof_type (operand, op, true);
else
- return cxx_sizeof_or_alignof_expr (operand, op, true);
+ {
+ /* Pedwarn if alignof is used with a non type expression.
+ However __alignof__ is ok. */
+ if (!strcmp(IDENTIFIER_POINTER (token->u.value), "alignof"))
+ pedwarn (token->location, OPT_pedantic,
+ "ISO C++ does not allow %<alignof%> "
+ "with a non-type");
+
+ return cxx_sizeof_or_alignof_expr (operand, op, true);
+ }
}
case RID_NEW:
Changelog:
gcc/cp/
2010-11-14 Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
* parser.c (cp_parser_unary_expression): Call pedwarn por alignof
with expression.