https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106049
--- Comment #2 from anlauf at gcc dot gnu.org --- (In reply to anlauf from comment #1) > Maybe there is a better solution. Here's an alternative, probably more general approach that modifies is_constant_array_expr: when the array size - as implied by the shape - is larger than zero, but the constructor is empty, then something went wrong, and we return false: diff --git a/gcc/fortran/simplify.cc b/gcc/fortran/simplify.cc index ab59fbca622..fb725994653 100644 --- a/gcc/fortran/simplify.cc +++ b/gcc/fortran/simplify.cc @@ -233,6 +233,18 @@ is_constant_array_expr (gfc_expr *e) if (e->expr_type != EXPR_ARRAY || !gfc_is_constant_expr (e)) return false; + /* A non-zero-sized constant array shall have a non-empty constructor. */ + if (e->rank > 0 && e->shape != NULL && e->value.constructor == NULL) + { + mpz_init_set_ui (size, 1); + for (int j = 0; j < e->rank; j++) + mpz_mul (size, size, e->shape[j]); + bool not_size0 = (mpz_cmp_si (size, 0) != 0); + mpz_clear (size); + if (not_size0) + return false; + } + for (c = gfc_constructor_first (e->value.constructor); c; c = gfc_constructor_next (c)) if (c->expr->expr_type != EXPR_CONSTANT This seems to regtest OK.