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ld reported a message like :
"undefiend reference f in file mainfile.c "
f is a function declared in a header , say : "file.h" and I included it in mainfile.c !!

when I put
#include "file.c" instead of #include "file.h" , things go right !

thanks

Um.. I don't think I understand you clearly.. would you post the code?
Cheers

Err, short on details, but maybe because you aren't actually compiling/linking mainfile.c with file.c?

Just including the header doesn't tell the linker which file contains the code.

The proper approach is to
- include the header stuff.h in the main.c file
- compile both stuff.c and main.c files separately (-c)
- link them together (ld stuff.o main.o)