https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82939
--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
Unreliable testcase ("works" for me at -O2 but not -O0 -- we need the
default-constructed assignment RHS on the stack to have an uninitialized value
of non-zero):
struct line_maps {
~line_maps ();
bool trace_includes;
};
line_maps::~line_maps () {}
int main ()
{
line_maps m;
m.trace_includes = true;
m = line_maps ();
if (m.trace_includes)
return 1;
return 0;
}
at -O2 gcc 4.2.3 optimizes this to just
main:
.LFB5:
movzbl %al, %eax
ret
...
