need assistance with multiple files

ok i got two files, one has functions in it the other uses them, pretty simple right :D

in one file i have this

Code:

---

static void xtoa(unsigned long val, char *buf, unsigned int radix, int negative)
{...}
char *itoa(int val, char *buf, int radix)
{...}

---

In the other i had

Code:

---

extern static void xtoa(unsigned long val, char *buf, unsigned int radix, int negative);
extern char* itoa(int, char*, int);

---

which gave me an error saying multiple storage classes, which i solved by removing the extern infront of "static void xtoa...", but now i get the error

Code:

---

Server.o(.text+0x2178):Server.cpp: undefined reference to `itoa(int, char*, int)'

---

this is the error i cant seem to solve, i have the definitions the same in both files, so why cant it find it?
(and yes i do link them together when i compile the project)

When 'static' is applied to a function, it means the function is defined inside the file. extern means the function is defined outside the scope it is declared in.

Try this:

1) Put this function in your first file:

Code:

---

#include <iostream>
using namespace std;
...
...
void test()
{
    cout<<"hello world"<<endl;
}

---

Code:

---

2) Put this in your second file:

void test();

int main()
{
    test();
   
    .....

---

if say i have a function
static int test()
in another file would i proto type it
extern static int test()
extern int test()
or
static int test()
?

1) Reread my earlier post, I added something.

2) Why are you messing around with the 'static' and 'extern' keywords?

3)

Quote:

---

in another file would i proto type it
extern static int test()

---

Since static means DO NOT look outside the current file for the function definition, and extern means GO LOOK OUTSIDE the current scope for the definition, what could you possibly mean by declaring a function as 'extern static'?

> which gave me an error saying multiple storage classes, which i solved by removing the extern
You should have removed the static, if you're calling a function from multiple source files.

Quote:

---

You should have removed the static, if you're calling a function from multiple source files.

---

...and since functions have external linkage by default, you can remove the extern too, right?

:P i just realized i dont need to proto type the static function anywere :D...

but that only solves one problem... the main one is still left

Code:

---

Server.o(.text+0x2144): In function `getData(int)':
Server.cpp: undefined reference to `itoa(int, char*, int)'

---

i have tried compiling with and without extern in front of the prototype with no success, so i think i am missing something... here is the whole compiler output in case it helps

Code:

---

$ make -f makefile.server
gcc -c xtoa.c -o xtoa.o
g++ -c Server.cpp -o Server.o    -L/usr/local/lib
g++ -c character.cpp -o character.o    -L/usr/local/lib
g++ xtoa.o Server.o character.o  -o Server -L/usr/local/lib --export-dynamic -lalleg-4.2.0 -lalleg_unsharable -lNL -lpthreadServer.o(.text+0x2144): In function `getData(int)':
Server.cpp: undefined reference to `itoa(int, char*, int)'
Server.o(.text+0x2178):Server.cpp: undefined reference to `itoa(int, char*, int)'
Server.o(.text+0x21ac):Server.cpp: undefined reference to `itoa(int, char*, int)'
Server.o(.text+0x21e0):Server.cpp: undefined reference to `itoa(int, char*, int)'
Server.o(.text+0x2214):Server.cpp: undefined reference to `itoa(int, char*, int)'
collect2: ld returned 1 exit status
make: *** [Server] Error 1

---

sorry if the answer is there and i just dont see it.

Well it can't find itoa()

Which means either you haven't written it, haven't compiled it, got the prototype wrong (since you're calling it from C++), mis-spelt it somewhere, or not passing the .o file it's in to the linker.