policy_illegal_archchange
if (is->arch != s->arch && policy_illegal_archchange(solv, is, s))
if (!allowarchchange && s->arch != ps->arch && policy_illegal_archchange(solv, s, ps))
if (!allowarchchange && s->arch != ps->arch && policy_illegal_archchange(solv, s, ps))
extern int policy_illegal_archchange(Solver *solv, Solvable *s1, Solvable *s2);