Thread: HELP: linking several object files

I want to link some object files. I use the attached "makefile", but I got the following error when making the executable file:

UX:ld: ERROR: Doctors.o: fatal error: symbol `scr_name` multiply-defined, also in file centre.o
collect2: ld returned 1 exit status
*** Error code 1 (bu21)
UX:make: ERROR: fatal error

Actually, the symbol scr_name is declared in medico.h file, which is included in all the .c files.

I even had to use -include option for compiling each .c file because the line

centre.o : centre.c medico.h


does not work.

tanx.

scr_name is a variable defind in (and only in!) medico.h as followed:


char * scr_name[MAX_SCREEN_CNT] = {
"ERROR"
...


and as you may see in the attached makefile, all the .c programs include the header file. The header file and all the c files are in the same directory.

When I remove the -include parameter from gcc -c commands, it does not include the header file, and gives error message for all the varaibles and functions declared in medico.h.

Originally posted by Salem
scr_name() should be defined in the .h file, and declared ONCE in one of the .c files.

Shouldn't it be the other way around?
scr_name() should be declared in the .h file, and defined ONCE in one of the .c files.

I changed the medico.h file as below:


extern int INSERT_MODE;
extern int INQUIRY; /* will be true or false */
extern int PRINT_HARD_COPY; /* hard copy on printer */
extern char LOG_FILE_NAME[MED_MAX_SIZE];
extern char * typ_ary[];
extern char * scr_name[MAX_SCREEN_CNT];


And I added a function to initialze these vars. This function is called at the main function:


int Init_Global_Vars(void) {

int rc = TRUE;

int INSERT_MODE = TRUE;
int INQUIRY;
int PRINT_HARD_COPY = FALSE;

char * scr_name[MAX_SCREEN_CNT] = {
"ERROR"
,"DOCTORS"
...


Now, I get the following error:

Undefined first referenced
symbol in file
INSERT_MODE Capture.o
scr_name common.o
INQUIRY common.o
typ_ary Capture.o
PRINT_HARD_COPY Reports.o
LOG_FILE_NAME common.o

UX:ld: ERROR: medico: fatal error: Symbol referencing errors. No output written to medico
collect2: ld returned 1 exit status
*** Error code 1 (bu21)
UX:make: ERROR: fatal error.


I have included medico.h in the above .c files.