Please read chapter 3.4.1.7 of SDCC manual for the __sbit syntax in SDCC.
However, the port bits are included in the device headers, so you can do
e.g. the following:
#include <8051.h>
#define RELAY P1_4
#define K1 P2_7
void main(void) {
if (!K1) RELAY = 0;
else RELAY = 1;
}
JW
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