window_mover.c:(.text.window_mover_step+0x1506): undefined reference to `__muldi3'
window_mover.c:(.text.window_mover_step+0x1696): undefined reference to `__muldi3'
window_mover.c:(.text.window_mover_step+0x17c2): undefined reference to `__muldi3'
window_mover.c:(.text.window_mover_step+0x18ee): undefined reference to `__muldi3'
window_mover.c:(.text.window_mover_step+0x19fa): undefined reference to `__muldi3'

getting following error in linker. My code has has 64 bit operation and I have included math.a in linker