pub unsafe extern fn dstedc_(compz: *const c_char,
n: *const lapack_int,
d: *mut c_double,
e: *mut c_double,
z: *mut c_double,
ldz: *const lapack_int,
work: *mut c_double,
lwork: *const lapack_int,
iwork: *mut lapack_int,
liwork: *const lapack_int,
info: *mut lapack_int)