https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120748
Bug ID: 120748
Summary: New crash with lambda code
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
For this C++ code:
namespace PR45881 {
struct A {
void f();
};
int id(A*);
void A::f() {
auto z = [*this](auto z2, decltype(z2(this)) z3){};
z(id,3);
}
struct B {
void f();
};
void B::f() {
auto z = []<typename TT, typename TTT=decltype(TT()(this))>(){return 0;};
z.template operator()<int(*)(B*)>();
}
struct C {
void f();
};
void C::f() {
auto z = []<typename TT, decltype(TT()(this)) n>(){return 0;};
z.template operator()<int(*)(C*), 8>();
}
} // namespace PR45881
copied from clang's C++ testsuite, recent g++ does this:
test $ ~/gcc/results.20250620.asan.ubsan/bin/g++ -c -w
./SemaCXX/cxx20-lambda-decltype-this.cpp
g++: internal compiler error: Segmentation fault signal terminated program
cc1plus
clang++ seems quite happy with it:
test $ ~/llvm/results.20250619/bin/clang++ -c -w
./SemaCXX/cxx20-lambda-decltype-this.cpp
test $
This problem first seems to occur sometime between g:5c6364b09a67de8d
and g:e131ba3de5f487f5.
