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* [Bug c++/61951] New: -wExtra switch produce warning: parameter 'ptr' set but not used [-Wunused-but-set-parameter] @ 2014-07-29 15:13 moblaza at gmail dot com 2014-09-17 16:42 ` [Bug c++/61951] -Wextra " paolo.carlini at oracle dot com ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: moblaza at gmail dot com @ 2014-07-29 15:13 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61951 Bug ID: 61951 Summary: -wExtra switch produce warning: parameter 'ptr' set but not used [-Wunused-but-set-parameter] Product: gcc Version: 4.8.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: moblaza at gmail dot com Created attachment 33204 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33204&action=edit program with this code example Hello! Il write code example with lambda expression, with operator new class allocation, and g++ produce warning: D:\workspace\gcc_test1\main.cpp:33:67: warning: parameter 'ptr' set but not used [-Wunused-but-set-parameter] std::for_each(ref.begin(), ref.end(), [](Base* ptr){ but after allocation, lambda parameter is used also in lambda expression with for_each algorithm. See attached code. PS. My: gcc version 4.8.1 (rev5, Built by MinGW-W64 project) ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/61951] -Wextra switch produce warning: parameter 'ptr' set but not used [-Wunused-but-set-parameter] 2014-07-29 15:13 [Bug c++/61951] New: -wExtra switch produce warning: parameter 'ptr' set but not used [-Wunused-but-set-parameter] moblaza at gmail dot com @ 2014-09-17 16:42 ` paolo.carlini at oracle dot com 2014-09-17 16:56 ` jakub at gcc dot gnu.org 2014-09-19 9:43 ` paolo.carlini at oracle dot com 2 siblings, 0 replies; 4+ messages in thread From: paolo.carlini at oracle dot com @ 2014-09-17 16:42 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61951 Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2014-09-17 CC| |jakub at redhat dot com Summary|-wExtra switch produce |-Wextra switch produce |warning: parameter 'ptr' |warning: parameter 'ptr' |set but not used |set but not used |[-Wunused-but-set-parameter |[-Wunused-but-set-parameter |] |] Ever confirmed|0 |1 --- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> --- Maybe Jakub is willing to have a look. Otherwise I may come to it. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/61951] -Wextra switch produce warning: parameter 'ptr' set but not used [-Wunused-but-set-parameter] 2014-07-29 15:13 [Bug c++/61951] New: -wExtra switch produce warning: parameter 'ptr' set but not used [-Wunused-but-set-parameter] moblaza at gmail dot com 2014-09-17 16:42 ` [Bug c++/61951] -Wextra " paolo.carlini at oracle dot com @ 2014-09-17 16:56 ` jakub at gcc dot gnu.org 2014-09-19 9:43 ` paolo.carlini at oracle dot com 2 siblings, 0 replies; 4+ messages in thread From: jakub at gcc dot gnu.org @ 2014-09-17 16:56 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61951 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Is there anything wrong on the warning though? [](Base* ptr){ ptr = new Deliv(); } I think ptr here is lambda parameter, does it behave any different from parameter to any other function? void foo (Base* ptr) { ptr = new Deliv(); } warns about parameter 'ptr' set but not used intentionally, so why shouldn't it we warn about it in the lambda? Doesn't the lambda just leak memory and not actually store the pointer anywhere (it stores it into the parameter which is never used)? ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/61951] -Wextra switch produce warning: parameter 'ptr' set but not used [-Wunused-but-set-parameter] 2014-07-29 15:13 [Bug c++/61951] New: -wExtra switch produce warning: parameter 'ptr' set but not used [-Wunused-but-set-parameter] moblaza at gmail dot com 2014-09-17 16:42 ` [Bug c++/61951] -Wextra " paolo.carlini at oracle dot com 2014-09-17 16:56 ` jakub at gcc dot gnu.org @ 2014-09-19 9:43 ` paolo.carlini at oracle dot com 2 siblings, 0 replies; 4+ messages in thread From: paolo.carlini at oracle dot com @ 2014-09-19 9:43 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61951 Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |INVALID --- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> --- Thanks Jakub. Now that I notice that specific line and you confirmed that the warning is intentional in the non-lambda case, I believe we can close the bug. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-09-19 9:43 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-07-29 15:13 [Bug c++/61951] New: -wExtra switch produce warning: parameter 'ptr' set but not used [-Wunused-but-set-parameter] moblaza at gmail dot com 2014-09-17 16:42 ` [Bug c++/61951] -Wextra " paolo.carlini at oracle dot com 2014-09-17 16:56 ` jakub at gcc dot gnu.org 2014-09-19 9:43 ` paolo.carlini at oracle dot com
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