If you want to compile each of the files into object files before linking them all together, then you need to add "-c" to the command line. This tells GCC to stop after the .o file is created. Then, you can run GCC with all the object files and create your program: gcc -o prog_name main.o dutils.o This will link to object files together into the main program named "prog_name". You can, of course, change the output name to something else more appropriate. Otherwise, you can compile and link all your source files at once like this: gcc -o prog_name main.c dutils.c This will compile both source files and write your program out to "prog_name". Thanks, Lyle Taylor IS Applications -----Original Message----- From: Andre Kirchner [mailto:sieg1974@xxxxxxxxx] Sent: Friday, September 12, 2003 3:45 PM To: gcc-help@xxxxxxxxxxx Subject: Newbie question about compilation Hi, how can I compile a program that is divided in many .h and .c files? I have done this program divided in these files dutils.h: # include <stdio.h> int makeDir(); dutils.c: # include "dutils.h" int makeDir() { printf( "worked\n" ); return( 1 ); } main.c: # include "dutils.h" int main() { makeDir(); return( 0 ); } But when I try to compile it I got this error message [andre@Deutschland asp2]$ gcc ./main.c -o ./main.out /tmp/ccIA1jr7.o(.text+0x11): In function `main': : undefined reference to `makeDir' collect2: ld returned 1 exit status Thanks, Andre __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com
