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Re: [Bug c++/21930] New: [4.1 regression] pretty printer confusion
- From: Gabriel Dos Reis <gdr at integrable-solutions dot net>
- To: gcc-bugzilla at gcc dot gnu dot org
- Cc: gcc-bugs at gcc dot gnu dot org
- Date: 06 Jun 2005 17:59:42 +0200
- Subject: Re: [Bug c++/21930] New: [4.1 regression] pretty printer confusion
- References: <20050606143234.21930.reichelt@gcc.gnu.org>
"reichelt at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> writes:
| The error message reads:
|
| bug.cc: In function 'void foo(const A<N>&) [with int N = 0]':
| bug.cc:7: instantiated from here
| bug.cc:3: error: no match for 'operator-' in '-((const A<0>&)#'convert_expr'
| not supported by dump_expr#<expression error>)'
|
| With gcc 4.0.0 I get the following message instead:
|
| bug.cc: In function 'void foo(const A<N>&) [with int N = 0]':
| bug.cc:7: instantiated from here
| bug.cc:3: error: no match for 'operator-' in '-((const A<0>&)(+ a))'
|
| I don't know why the plus sign appears before "a",
The plus sign is a bogosity in the tree representation, not correctly
understaood by the pretty-printer, which cannot differentiate between
conversion from reference to pointer, lvalue->rvalue conversion and
real unary plus. They usually appear under the cover of CONVERT_EXPR.
| but this suggests that
| the regression is related to the recent introduction of UNARY_PLUS_EXPR:
| http://gcc.gnu.org/ml/gcc-patches/2005-05/msg02580.html
Indeed.
-- Gaby