Why vc++ link can not find function which is built in the same project?

Hi there,

When I try to build the executable, the error is as the following:

iis.obj : error LNK2001: unresolved external symbol "int __cdecl lm(int,char *)" (?lm@@YAHHPAD@Z)
Debug/iis.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

The function is defined in the file buildd.c

Code:

---

//buildd.c
#include <stdio.h>
#include "buildd.h"

int __cdecl lm(int i,char * filename)
{
        return i + strlen(filename);
}

file buildd.h

#include "StdAfx.h"

int __cdecl lm(int i,char * filename);

---

and in iis.cpp, the code invoking the function lm is located in the body of int APIENTRY WinMain, which is:

inm = lm(10,ryDict);

Why the vc++ link can not find the function lm, which is built in the same project?

Thanks,

> buildd.c
Goto project settings, and add this source file to the list of source files in the project.
So you should have
buildd.c
iis.cpp

2. Do you really want to mix C and C++?
Is there any particular reason why one of them needs to be in C ?

Oh, certainly I add these files into project through Project "Add to Project" before I posted, and so I post the issue.

I even use the following link command. It still does not work

Code:

---

        link -debug:full -debugtype:cv /NODEFAULTLIB /INCREMENTAL:NO /PDB:NONE /
RELEASE /NOLOGO -subsystem:windows,4.0  iis.obj builddict.obj iis.res libc.lib
oldnames.lib kernel32.lib  ws2_32.lib mswsock.lib advapi32.lib user32.lib gdi32.
lib comdlg32.lib winspool.lib version.lib comctl32.lib shell32.lib  -out:is.exe

iis.obj : error LNK2001: unresolved external symbol "int __cdecl lm(int,char *)"
 (?lm@@YAHHPAD@Z)
is.exe : fatal error LNK1120: 1 unresolved externals
NMAKE : fatal error U1077: 'link' : return code '0x460'
Stop.

---

Second, I have lot other codes in c. You can see I simplify the code to try it out.


Thanks,

http://parashift.com/c++-faq-lite/mixing-c-and-cpp.html
http://parashift.com/c++-faq-lite/mi....html#faq-32.4

Thanks, it works.

Happy new year to every one.