https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106124
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- int q; struct A { typedef int T; #pragma omp declare reduction (x : T : omp_out += omp_in + [] (){ return q; }()) initializer (omp_priv = [](){ return 0; }()) static void foo (); }; void bar (int &, int &); void A::foo () { int r = 0, s = 0; #pragma omp parallel reduction (x : r, s) bar (r, s); } ICEs too with the same options, but in a different spot.