LNK2001, again

Question

I looked for similar problems, but the only topic might be the one on the use of a library, which I would avoid... here is my issue, I get this error:

1>Signal generator.obj : error LNK2001: unresolved external symbol "double __cdecl findMaxModulus(double *,int)" (?findMaxModulus@@YANPANH@Z)

I am using visual studio professional 2008 to develop a c program. I have a main file and another file with all the functions I wrote, myFunctions.h/c. The problem is that these errors do not come out when I include "myFunctions.c", while they come out when I include "myFunctions.h".

i am doing what i remember from university (i am much more into matlab now), which is

/* Home-made includes */
#include "myType.h"
#include "myFunctions.h"

just after the inclusion of the othe headers (stdlib, math, etc...)

any guess? thank you

Answer 1

The error means the linker could not find the function. This most likely means that you aren't compiling your myFunctions.c file at all. Make sure it's added as a "source file" to the project in Visual Studio.

Answer 2

If you want to try on gcc try to compile both .c files same like this below:

gcc -Wall main.c myfunction.c -o final.out

You are missing the other .c file.So in the linking phase linker could not resolve the external symbol (which is your function). Try as I said.

For Visual Studio: You need to check whether all the source files are checked to make a build. there is an option to include number of files from the several source files.