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* [Bug c/14710] New: Warning about useless casts @ 2004-03-24 6:35 debian-gcc at lists dot debian dot org 2004-03-24 6:40 ` [Bug c++/14710] " pinskia at gcc dot gnu dot org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: debian-gcc at lists dot debian dot org @ 2004-03-24 6:35 UTC (permalink / raw) To: gcc-bugs [forwarded from http://bugs.debian.org/237207] It would be nice if there was an option to add a warning about "useless" casts. Although they are not really incorrect, they might become incorrect/inefficient as the program evolves. Ie; struct A { int a; }; struct B : A { int b; }; void func(A *a) { ++a; } int main(int ac, char **av) { A a; B b; func((A*)&a); // Useless cast since a already is an A. func(static_cast<A*>(&a)); // Just as useless. func((A*)&b); // Useless cast since b is a kind of A. func(static_cast<A*>(&b)); // Just as useless. return 0; } -- Summary: Warning about useless casts Product: gcc Version: 3.3.4 Status: UNCONFIRMED Severity: enhancement Priority: P2 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: debian-gcc at lists dot debian dot org CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14710 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/14710] Warning about useless casts 2004-03-24 6:35 [Bug c/14710] New: Warning about useless casts debian-gcc at lists dot debian dot org @ 2004-03-24 6:40 ` pinskia at gcc dot gnu dot org 2004-03-24 16:50 ` gdr at integrable-solutions dot net ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-03-24 6:40 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-03-24 06:40 ------- Confirmed, but I do not know how useful this is. -- What |Removed |Added ---------------------------------------------------------------------------- Component|c |c++ Keywords| |diagnostic http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14710 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/14710] Warning about useless casts 2004-03-24 6:35 [Bug c/14710] New: Warning about useless casts debian-gcc at lists dot debian dot org 2004-03-24 6:40 ` [Bug c++/14710] " pinskia at gcc dot gnu dot org @ 2004-03-24 16:50 ` gdr at integrable-solutions dot net 2004-03-24 16:56 ` pinskia at gcc dot gnu dot org 2004-04-02 7:49 ` stl at caltech dot edu 3 siblings, 0 replies; 5+ messages in thread From: gdr at integrable-solutions dot net @ 2004-03-24 16:50 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From gdr at integrable-solutions dot net 2004-03-24 16:50 ------- Subject: Re: Warning about useless casts "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> writes: | Confirmed, but I do not know how useful this is. Please can you make it an enhancement with low priority? -- Gaby -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14710 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/14710] Warning about useless casts 2004-03-24 6:35 [Bug c/14710] New: Warning about useless casts debian-gcc at lists dot debian dot org 2004-03-24 6:40 ` [Bug c++/14710] " pinskia at gcc dot gnu dot org 2004-03-24 16:50 ` gdr at integrable-solutions dot net @ 2004-03-24 16:56 ` pinskia at gcc dot gnu dot org 2004-04-02 7:49 ` stl at caltech dot edu 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-03-24 16:56 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-03-24 16:56 ------- Should have confirmed it. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Priority|P2 |P3 Last reconfirmed|0000-00-00 00:00:00 |2004-03-24 16:56:18 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14710 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/14710] Warning about useless casts 2004-03-24 6:35 [Bug c/14710] New: Warning about useless casts debian-gcc at lists dot debian dot org ` (2 preceding siblings ...) 2004-03-24 16:56 ` pinskia at gcc dot gnu dot org @ 2004-04-02 7:49 ` stl at caltech dot edu 3 siblings, 0 replies; 5+ messages in thread From: stl at caltech dot edu @ 2004-04-02 7:49 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From stl at caltech dot edu 2004-04-02 07:49 ------- I am in favor of this warning, though I don't expect that it would occur often (except in C, where programmers incessantly cast the return values of malloc() and friends). -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14710 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2004-04-02 7:49 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-03-24 6:35 [Bug c/14710] New: Warning about useless casts debian-gcc at lists dot debian dot org 2004-03-24 6:40 ` [Bug c++/14710] " pinskia at gcc dot gnu dot org 2004-03-24 16:50 ` gdr at integrable-solutions dot net 2004-03-24 16:56 ` pinskia at gcc dot gnu dot org 2004-04-02 7:49 ` stl at caltech dot edu
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