RPi.GPIO with C

[Wolfenstein]

Related to this thread http://forum.pine64.org/showthread.php?tid=723 I am trying to build and use the functions in C. I copied all files from RPi.GPIO-PineA64/source and I made these files


test.c

Code:

#include "c_gpio.h"
#include "test.h"

int main(void)
{
   printf("testfunktoin()=%i\n", testfunktion());
   
   setup();
   
   return 0;
}

makefile

Code:

HEADERS = test.h c_gpio.h
OBJECTS = test.o c_gpio.o

default: test

%.o: %.c $(HEADERS)
    gcc -c $< -o $@

test: $(OBJECTS)
    gcc $(OBJECTS) -o $@

clean:
    -rm -f $(OBJECTS)
    -rm -f test

test.h

Code:

int testfunktion(void)
{
   return 44;
}

And I get this compile error:

Code:

$ make
gcc test.o c_gpio.o -o test
c_gpio.o: In function `setup':
c_gpio.c:(.text+0x40): undefined reference to `pinea64_found'
c_gpio.c:(.text+0x44): undefined reference to `pinea64_found'
c_gpio.c:(.text+0x2cc): undefined reference to `pinea64_found'
c_gpio.c:(.text+0x2d0): undefined reference to `pinea64_found'
c_gpio.o: In function `clear_event_detect':
c_gpio.c:(.text+0x378): undefined reference to `pinea64_found'
c_gpio.o:c_gpio.c:(.text+0x37c): more undefined references to `pinea64_found' follow
collect2: error: ld returned 1 exit status
makefile:12: recipe for target 'test' failed
make: *** [test] Error 1