public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
* [Bug c++/49251] New: [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples @ 2011-06-01 8:24 gintensubaru at gmail dot com 2011-06-15 17:31 ` [Bug c++/49251] " jason at gcc dot gnu.org ` (5 more replies) 0 siblings, 6 replies; 7+ messages in thread From: gintensubaru at gmail dot com @ 2011-06-01 8:24 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49251 Summary: [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: trivial Priority: P3 Component: c++ AssignedTo: unassigned@gcc.gnu.org ReportedBy: gintensubaru@gmail.com #include <tuple> template< std::size_t... Indices > struct indices {}; template< class... Args > void sink( Args&&... ) {} template< class Tuple, std::size_t... Indices > void unpack_test( Tuple && t, indices<Indices...> ) { sink( std::get<Indices>(t)... ); } int main() { unpack_test( std::tuple<>(), indices<>() ); } ------------------------ This code, which is unpacking tuples, raises unused parameter warning: $ g++ -std=c++0x -Wunused-parameter bug.cc bug.cc: In instantiation of 'void unpack_test(Tuple&&, indices<Indices ...>) [with Tuple = std::tuple<>, unsigned int ...Indices = {}]': bug.cc:15:44: instantiated from here bug.cc:10:6: warning: unused parameter 't' [-Wunused-parameter] I've confirmed this behavior on following versions: 4.5.0 4.5.3 4.6.0 4.6-20110527 4.7-20110528 It can be avoided by using the parameter explicitly, like `(void)t;', but it's not always used. ( For example, it cannot be used for constexpr functions. ) ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49251] [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples 2011-06-01 8:24 [Bug c++/49251] New: [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples gintensubaru at gmail dot com @ 2011-06-15 17:31 ` jason at gcc dot gnu.org 2011-06-15 18:07 ` jason at gcc dot gnu.org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: jason at gcc dot gnu.org @ 2011-06-15 17:31 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49251 Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2011.06.15 17:31:05 CC| |jason at gcc dot gnu.org AssignedTo|unassigned at gcc dot |jason at gcc dot gnu.org |gnu.org | Ever Confirmed|0 |1 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49251] [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples 2011-06-01 8:24 [Bug c++/49251] New: [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples gintensubaru at gmail dot com 2011-06-15 17:31 ` [Bug c++/49251] " jason at gcc dot gnu.org @ 2011-06-15 18:07 ` jason at gcc dot gnu.org 2011-06-16 22:14 ` jason at gcc dot gnu.org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: jason at gcc dot gnu.org @ 2011-06-15 18:07 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49251 Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |lene13 at gmail dot com --- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> 2011-06-15 18:06:43 UTC --- *** Bug 49339 has been marked as a duplicate of this bug. *** ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49251] [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples 2011-06-01 8:24 [Bug c++/49251] New: [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples gintensubaru at gmail dot com 2011-06-15 17:31 ` [Bug c++/49251] " jason at gcc dot gnu.org 2011-06-15 18:07 ` jason at gcc dot gnu.org @ 2011-06-16 22:14 ` jason at gcc dot gnu.org 2011-06-17 1:08 ` jason at gcc dot gnu.org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: jason at gcc dot gnu.org @ 2011-06-16 22:14 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49251 --- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-06-16 22:09:00 UTC --- Author: jason Date: Thu Jun 16 22:08:57 2011 New Revision: 175119 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=175119 Log: PR c++/49251 * semantics.c (finish_id_expression): Mark even dependent variables as used. Added: trunk/gcc/testsuite/g++.dg/cpp0x/variadic113.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/semantics.c trunk/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49251] [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples 2011-06-01 8:24 [Bug c++/49251] New: [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples gintensubaru at gmail dot com ` (2 preceding siblings ...) 2011-06-16 22:14 ` jason at gcc dot gnu.org @ 2011-06-17 1:08 ` jason at gcc dot gnu.org 2011-06-17 1:11 ` jason at gcc dot gnu.org 2011-08-29 12:52 ` redi at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: jason at gcc dot gnu.org @ 2011-06-17 1:08 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49251 --- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-06-17 01:06:46 UTC --- Author: jason Date: Fri Jun 17 01:06:42 2011 New Revision: 175130 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=175130 Log: PR c++/49251 * semantics.c (finish_id_expression): Mark even dependent variables as used. Added: branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/variadic113.C Modified: branches/gcc-4_6-branch/gcc/cp/ChangeLog branches/gcc-4_6-branch/gcc/cp/semantics.c branches/gcc-4_6-branch/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49251] [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples 2011-06-01 8:24 [Bug c++/49251] New: [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples gintensubaru at gmail dot com ` (3 preceding siblings ...) 2011-06-17 1:08 ` jason at gcc dot gnu.org @ 2011-06-17 1:11 ` jason at gcc dot gnu.org 2011-08-29 12:52 ` redi at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: jason at gcc dot gnu.org @ 2011-06-17 1:11 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49251 Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution| |FIXED Target Milestone|--- |4.6.1 --- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2011-06-17 01:10:56 UTC --- Fixed for 4.6.1. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49251] [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples 2011-06-01 8:24 [Bug c++/49251] New: [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples gintensubaru at gmail dot com ` (4 preceding siblings ...) 2011-06-17 1:11 ` jason at gcc dot gnu.org @ 2011-08-29 12:52 ` redi at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: redi at gcc dot gnu.org @ 2011-08-29 12:52 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49251 --- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-08-29 12:39:36 UTC --- *** Bug 50224 has been marked as a duplicate of this bug. *** ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2011-08-29 12:41 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2011-06-01 8:24 [Bug c++/49251] New: [C++0x][parameter pack expanding] unused parameter warning with unpacking empty tuples gintensubaru at gmail dot com 2011-06-15 17:31 ` [Bug c++/49251] " jason at gcc dot gnu.org 2011-06-15 18:07 ` jason at gcc dot gnu.org 2011-06-16 22:14 ` jason at gcc dot gnu.org 2011-06-17 1:08 ` jason at gcc dot gnu.org 2011-06-17 1:11 ` jason at gcc dot gnu.org 2011-08-29 12:52 ` redi at gcc dot gnu.org
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).