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* [Bug c++/20576] New: poor diagnostic @ 2005-03-21 12:26 igodard at pacbell dot net 2005-03-21 12:39 ` [Bug c++/20576] " igodard at pacbell dot net ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: igodard at pacbell dot net @ 2005-03-21 12:26 UTC (permalink / raw) To: gcc-bugs In: struct bottom {}; template<typename v, typename next> struct node: public next { v val; }; enum a {b, c}; enum x{y, z}; struct foo : public node<a, node<x, bottom> > {}; template<typename T, typename U> void bar(node<T, U>&) {} int main() { foo f; bar(f); return 0; } you get: ~/ootbc/members/src$ g++ foo.cc foo.cc: In function `int main()': foo.cc:10: error: no matching function for call to `bar(foo&)' Actually, there is a matching function, but the call is ambiguous because there are two matching base classes. The diagnostic should say so and identify the matching bases. This is reported correctly by other ambiguous calls where two different functions are matches to the argument set. In this case one function has two different matches, but the user's need in the diagnostic is the same: show what the compiler found. Ivan -- Summary: poor diagnostic Product: gcc Version: 3.4.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: igodard at pacbell dot net CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20576 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/20576] poor diagnostic 2005-03-21 12:26 [Bug c++/20576] New: poor diagnostic igodard at pacbell dot net @ 2005-03-21 12:39 ` igodard at pacbell dot net 2005-03-21 22:05 ` bangerth at dealii dot org 2005-06-20 3:01 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: igodard at pacbell dot net @ 2005-03-21 12:39 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From igodard at pacbell dot net 2005-03-21 12:39 ------- The same case but using derivation from classes rather than templates: struct foo {}; struct bar : public foo {}; struct baz : public bar {}; struct baf : public foo, public baz {}; void F(foo&) {} int main() { baf b; F(b); return 0; } gives a much better diagnostic: ~/ootbc/members/src$ g++ foo.cc foo.cc:4: warning: direct base `foo' inaccessible in `baf' due to ambiguity foo.cc: In function `int main()': foo.cc:6: error: `foo' is an ambiguous base of `baf' -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20576 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/20576] poor diagnostic 2005-03-21 12:26 [Bug c++/20576] New: poor diagnostic igodard at pacbell dot net 2005-03-21 12:39 ` [Bug c++/20576] " igodard at pacbell dot net @ 2005-03-21 22:05 ` bangerth at dealii dot org 2005-06-20 3:01 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: bangerth at dealii dot org @ 2005-03-21 22:05 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From bangerth at dealii dot org 2005-03-21 22:05 ------- I'm absolutely positive this is a duplicate of a fair number of other PRs, though I can't find one with a 20 second search. PR 13979 may be one, but doesn't have a really short testcase so I can't tell for sure. W. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20576 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/20576] poor diagnostic 2005-03-21 12:26 [Bug c++/20576] New: poor diagnostic igodard at pacbell dot net 2005-03-21 12:39 ` [Bug c++/20576] " igodard at pacbell dot net 2005-03-21 22:05 ` bangerth at dealii dot org @ 2005-06-20 3:01 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-06-20 3:01 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-06-20 03:01 ------- *** This bug has been marked as a duplicate of 16057 *** -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20576 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-06-20 3:01 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-03-21 12:26 [Bug c++/20576] New: poor diagnostic igodard at pacbell dot net 2005-03-21 12:39 ` [Bug c++/20576] " igodard at pacbell dot net 2005-03-21 22:05 ` bangerth at dealii dot org 2005-06-20 3:01 ` pinskia at gcc dot gnu dot org
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