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* [Bug c++/63875] New: Bogus unused-but-set-parameter warning when expanding a variadic template argument pack
@ 2014-11-14 17:04 tejohnson at google dot com
2014-11-23 15:14 ` [Bug c++/63875] " paolo.carlini at oracle dot com
2015-02-02 16:25 ` tejohnson at google dot com
0 siblings, 2 replies; 3+ messages in thread
From: tejohnson at google dot com @ 2014-11-14 17:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63875
Bug ID: 63875
Summary: Bogus unused-but-set-parameter warning when expanding
a variadic template argument pack
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: tejohnson at google dot com
The following test case warns about a variable that is set but unused. The
parameter is unused when the argument pack has nothing in it, but it is never
set.
% cat b.cc
template <class... Ts>
void Sink(Ts...) {}
struct S {
int Get(int) { return 0; }
};
template <int... Is>
void F(S s) {
Sink(s.Get(Is)...);
}
int main() {
F<>({});
}
$ g++ -c -O b.cc -std=c++11 -Wall -Wunused-but-set-parameter
b.cc: In instantiation of 'void F(S) [with int ...Is = {}]':
b.cc:14:9: required from here
b.cc:9:10: warning: parameter 's' set but not used [-Wunused-but-set-parameter]
void F(S s) {
Google ref b/10709546.
^
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/63875] Bogus unused-but-set-parameter warning when expanding a variadic template argument pack
2014-11-14 17:04 [Bug c++/63875] New: Bogus unused-but-set-parameter warning when expanding a variadic template argument pack tejohnson at google dot com
@ 2014-11-23 15:14 ` paolo.carlini at oracle dot com
2015-02-02 16:25 ` tejohnson at google dot com
1 sibling, 0 replies; 3+ messages in thread
From: paolo.carlini at oracle dot com @ 2014-11-23 15:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63875
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC|tejohnson at google dot com |jakub at gcc dot gnu.org
--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Let's add Jakub.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/63875] Bogus unused-but-set-parameter warning when expanding a variadic template argument pack
2014-11-14 17:04 [Bug c++/63875] New: Bogus unused-but-set-parameter warning when expanding a variadic template argument pack tejohnson at google dot com
2014-11-23 15:14 ` [Bug c++/63875] " paolo.carlini at oracle dot com
@ 2015-02-02 16:25 ` tejohnson at google dot com
1 sibling, 0 replies; 3+ messages in thread
From: tejohnson at google dot com @ 2015-02-02 16:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63875
--- Comment #2 from Teresa Johnson <tejohnson at google dot com> ---
Ping. This is still an issue on trunk (as of today at r220345).
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-11-14 17:04 [Bug c++/63875] New: Bogus unused-but-set-parameter warning when expanding a variadic template argument pack tejohnson at google dot com
2014-11-23 15:14 ` [Bug c++/63875] " paolo.carlini at oracle dot com
2015-02-02 16:25 ` tejohnson at google dot com
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