https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100684
Bug ID: 100684
Summary: spurious -Wnonnull with -O1 on a C++ lambda
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
>From James Legg in comment pr98109 comment 2:
> The false positives can often be seen when converting a lambda to a function
> pointer at lower optimisation levels too. For example, in g++ 11.1.1,
> compiling:
> int main()
> {
> return static_cast<int (*)(int)>([](int x){ return x; })(0);
> }
>
> with -Og -Wall -fsanitize=undefined results in:
> /tmp/a.cc: In static member function ‘static constexpr int
> main()::<lambda(int)>::_FUN(int)’:
> /tmp/a.cc:3:63: warning: ‘this’ pointer is null [-Wnonnull]
> 3 | return static_cast<int (*)(int)>([](int x){ return x; })(0);
> | ^
> /tmp/a.cc:3:42: note: in a call to non-static member function
> ‘main()::<lambda(int)>’
> 3 | return static_cast<int (*)(int)>([](int x){ return x; })(0);
> | ^
