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* [Bug c++/105195] New: spurious warning label defined but not used with if constexpr
@ 2022-04-07 13:19 barry.revzin at gmail dot com
2022-04-07 13:29 ` [Bug c++/105195] " mpolacek at gcc dot gnu.org
2022-11-10 23:50 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: barry.revzin at gmail dot com @ 2022-04-07 13:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105195
Bug ID: 105195
Summary: spurious warning label defined but not used with if
constexpr
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: barry.revzin at gmail dot com
Target Milestone: ---
Similar to other "if constexpr" related warnings, gcc warns on this example:
void g();
void h();
template <bool B>
void f() {
if constexpr (B) {
goto label;
}
g();
label:
h();
}
int main() {
f<false>();
}
<source>:12:1: warning: label 'label' defined but not used [-Wunused-label]
12 | label:
| ^~~~~
But the label is used, just not in this particular instantiation.
^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug c++/105195] spurious warning label defined but not used with if constexpr 2022-04-07 13:19 [Bug c++/105195] New: spurious warning label defined but not used with if constexpr barry.revzin at gmail dot com @ 2022-04-07 13:29 ` mpolacek at gcc dot gnu.org 2022-11-10 23:50 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: mpolacek at gcc dot gnu.org @ 2022-04-07 13:29 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105195 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Keywords| |diagnostic CC| |mpolacek at gcc dot gnu.org Status|UNCONFIRMED |NEW Last reconfirmed| |2022-04-07 --- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Confirmed. ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/105195] spurious warning label defined but not used with if constexpr 2022-04-07 13:19 [Bug c++/105195] New: spurious warning label defined but not used with if constexpr barry.revzin at gmail dot com 2022-04-07 13:29 ` [Bug c++/105195] " mpolacek at gcc dot gnu.org @ 2022-11-10 23:50 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-11-10 23:50 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105195 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- MSVC warns too: <source>(12): warning C4102: 'label': unreferenced label <source>(17): note: see reference to function template instantiation 'void f<false>(void)' being compiled clang does not though. I think GCC should not warn either. ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-11-10 23:50 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-04-07 13:19 [Bug c++/105195] New: spurious warning label defined but not used with if constexpr barry.revzin at gmail dot com 2022-04-07 13:29 ` [Bug c++/105195] " mpolacek at gcc dot gnu.org 2022-11-10 23:50 ` pinskia at gcc dot gnu.org
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