I got the message error LINK: fatal error LNK1181 cannot open input file

[Zang_Lee]

I have Parallel Studio XE 2013 with Visual Studio 2013. .

1. I start a new IVF Project (static Lbrary)
2. In VS2013, I add a new  win32 console application to the IVF Project
3. I set the fortran function dependent to the main cpp

Please see below

//

#include "stdafx.h"
#include <iostream>


using namespace std;

extern "C"
 {
  void __cdecl FR1(int *a, int *b);
  int __cdecl FF1(int *c);
 }

int main()
{
 int n = 10;
 int nSq;
 int nCube;

 FR1(&n, &nSq);

 cout << "The square is:" << nSq << endl;

 nCube = FF1(&n);

 cout << "The cube is:" << nCube << endl;
 getchar();
 return 0;
}

// fortran f90

subroutine FR1(N,M)
!DEC$ ATTRIBUTES DLLEXPORT :: FR1
    
 M = N*N
return 
end
    
integer function FF1(N)
!DEC$ ATTRIBUTES DLLEXPORT :: FF1
   
FF1 = N*N*N
    return 
    end

I am trying to call  a fortran function f90 from C++, but i got two time the error message  LNK2019

error LNK2019: unresolved external symbol referenced "_FR1" in function _main

error LNK2019: unresolved external symbol referenced "_FF1" in function _main

 With Dumpbin /symbols I got the error message LINK: fatal error LNK1181 cannot open input file

C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC> cd c:\visual studio 2013
\Projekt2\Fortfunc\Debug

c:\visual studio 2013\Projekt2\Fortfunc\Debug>dumpbin/symbols Fortfunc.dll
Microsoft (R) COFF/PE Dumper Version 12.00.21005.1
Copyright (C) Microsoft Corporation.  All rights reserved.

Dump of file Fortfunc.dll
LINK : fatal error LNK1181: Eingabedatei "Fortfunc.dll" kann nicht geöffnet werden.

Thanks in Advance

[mecej4]

In more recent versions of Visual Studio, there are some impediments (set up by Microsoft?) to building projects in which the user wishes to mix sources in C/C++ and another language. See https://software.intel.com/en-us/articles/configuring-visual-studio-for-mixed-language-applications , where the procedure for accomplishing your goals is explained. Alternatively, you can build your sample easily at the command line. Compile the Fortran routine into a .OBJ file, and then do icl cmain.cpp fsub.obj .

[Zang_Lee]

I can't find the VC++-Directories from Tools->Options->Projects and Solutions ..it is outdated. Can you give me some Details about second Option of your alternativ ? Where and How can I do icl cmain.cpp fsub.obj ? please

[Steven_L_Intel1 · Accepted solution]

The article mecej4 links to explains how to do this in newer VS versions - keep reading. But for your problem, the following note in that article is also important:

NOTE: In Microsoft Visual Studio 2010 and later, a C++ project will not link in a non-C++ dependent project library. If you are using a C/C++ main program with a Fortran static or dynamic library as a dependent project, you must explicitly provide the path to the Fortran library, (the .lib export library in the case of a DLL project), in the C/C++ project's Linker > Additional Dependencies property, or as a "source file" in the project.

Is there a particular reason you're building the Fortran code as a DLL? Would a static library do?

[mecej4]

Zang Lee wrote:

I can't find the VC++-Directories from Tools->Options->Projects and Solutions ..it is outdated. Can you give me some Details about second Option of your alternativ ? Where and How can I do icl cmain.cpp fsub.obj ? 

I assumed that you have either the Microsoft VC or Intel C compiler installed.

You open an Intel Fortran command window (from the Start Menu or a suitable shortcut), and type the commands there. If you already have fsub.fxx compiled, the command that I gave (use cl instead of icl, if you do not have Intel C) will work if you have placed fsub.obj in the same directory as cmain.cpp.

[Zang_Lee]

Thank you Steve, I provide the path to the Fortran library as a source file in the Project and it works.

[Zang_Lee]

Thank you mecej4 for the article and thank you for Details about the second Option