[Bug c++/83806] New: Spurious unused-but-set-parameter with nullptr
barry.revzin at gmail dot com
gcc-bugzilla@gcc.gnu.org
Thu Jan 11 18:37:00 GMT 2018
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83806
Bug ID: 83806
Summary: Spurious unused-but-set-parameter with nullptr
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: barry.revzin at gmail dot com
Target Milestone: ---
This program:
template <class X, class Y>
bool equals(X x, Y y) {
return (x == y);
}
int main() {
const char* p = nullptr;
equals(p, nullptr);
}
When compiled as:
$ g++ -std=c++1z -Wunused-but-set-parameter bad.cxx
bad.cxx: In instantiation of ‘bool equals(X, Y) [with X = const char*; Y =
std::nullptr_t]’:
bad.cxx:8:22: required from here
bad.cxx:2:20: warning: parameter ‘y’ set but not used
[-Wunused-but-set-parameter]
bool equals(X x, Y y) {
^
But y is used, in a meaningful sense.
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