[Bug bootstrap/82939] genmatch fills up terminal with endless printing of periods

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82939

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
The following testcase from Jakub seems to work reliably at -O{0,1,2}:

extern "C" void abort ();
struct S { ~S () { if (x) abort (); }; int x, y, z; };
void foo (S *p) { *p = S (); }
int main () { S s; s.x = 1; s.y = 2; s.z = 3; foo (&s); if (s.x != 0 || s.y !=
0 || s.z != 0) abort (); }