Thread: gcc: undefined reference for phidgets functions

Hi,

I'm trying to write a simple test program to make some calls to a Phidgets board. I have the test app in a directory and the Phidgets files in a subdirectory. my include in my app looks like

Code:

#include "phidget21/phidget21.h"

and phidget21.h is in the subdirectory with the functions I call defined. When I go to make my program I get several undefined references.

Code:

root@desktop:/home/Coro#  gcc -o test test.c -I${PWD}/phidget21
/tmp/cc68a4cW.o: In function `main':
test.c:(.text+0xed): undefined reference to `CPhidgetInterfaceKit_create'
test.c:(.text+0x100): undefined reference to `CPhidget_open'
test.c:(.text+0x114): undefined reference to `CPhidget_getDeviceStatus'
test.c:(.text+0x139): undefined reference to `CPhidgetInterfaceKit_getSensorValue'
test.c:(.text+0x153): undefined reference to `CPhidgetInterfaceKit_getSensorValue'
test.c:(.text+0x16d): undefined reference to `CPhidgetInterfaceKit_getSensorValue'
test.c:(.text+0x187): undefined reference to `CPhidgetInterfaceKit_getSensorValue'
test.c:(.text+0x1a1): undefined reference to `CPhidgetInterfaceKit_getSensorValue'
/tmp/cc68a4cW.o:test.c:(.text+0x1bb): more undefined references to `CPhidgetInterfaceKit_getSensorValue' follow
collect2: ld returned 1 exit status

As I said earlier, all these functions are defined the phidget21.h which is located in the subdirectory...

Thanks for looking,
Chris

You need to compile phidget21.c and then link the resulting object file with test.o, eg:

Code:

root@desktop:/home/Coro#  gcc -o test.o test.c -I${PWD}/phidget21
root@desktop:/home/Coro#  gcc -o phidget21.o phidget21.c -I${PWD}/phidget21
root@desktop:/home/Coro#  gcc -o test test.o phidget21.o