[cc65] a compiler bug?

cc65 doesn't compile this, if i use the "-O"-option.
but it works with "while(!0)"; instead of  "for(;;);"

i'm using cl65 V2.12.9 win

----
#include <stdint.h>

int main(void)
{
 static uint8_t x = 0;
 static uint8_t y = 0;

    for (x = 0; x < 16; ++x)
    {
     y = y + 1;
    }
    for(;;);
}
----
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