"Predrag Stankovic" <pedjasns@xxxxxxxxxxx> writes: > I inherited a multi file C code, with a task to port to ARM Linux > platform. After some corrections, all files compile properly but > linker fails to link with "undefined reference to *" report. > I checked all files, referenced functions are declared properly, but > for some reason they are not linked. We can't help. The error message > attempt to open C:/UC/usr/lmain.o(.text+0x78): In function `main': > /cygdrive/c/Sandbox/uProcessor_V2/main.c:108: undefined reference to > `init_packet' says that the function 'main' refers to 'init_packet', and 'init_packet' is not defined anywhere. You need to find out where it should be defined, make sure it is not static, and figure out why it is not on the link command line. I note this: UCOMS2.o(.text+0xa70): In function `send_packet(int, unsigned char*)': /cygdrive/c/Sandbox/uProcessor_V2/UCOMS2.C:309: undefined reference to `delay_ms(int)' The presence of the parameter types in the symbol names suggests that this is C++ code. So perhaps the problem is that you are mixing C and C++ code but are not using extern "C" as required. Ian
