C++ code through DPI simulation error?

Hi Cadence,

I have write a simple C code through DPI example, it work OK.

Then, I write a simple C++ code through DPI example. And found C++ compile and SV compile/elaboration pass. But  DPI link error? I guess its not DPI cannot found the lib as show in the ncsim log. Because the C code through DPI use the same configuration.
My friend tried the same example in Synopsys VCS and work OK.


//--- adder.cpp---
#include
#include "svdpi.h"
extern "C"{
    int sum(int a, int b);
    }

class CADD
{
    private:
        int a;
        int b;
   
    public:
        CADD();
        ~CADD();
        int add(int a, int b);

};

CADD::CADD()
{
}

CADD::~CADD()
{
}

int CADD::add(int a, int b)
{
    int c = a +b;
    return c;
       
}

int sum(int a, int b)
{
    CADD add1;
    int result = add1.add(a,b);
    printf("the result is %d\n",result);
}
//------------

//-- C++ compile makefile
#!/bin/sh
g++ adder.cpp -fPIC -shared -o libdpi.so -I $CDS_INST_DIR/tools/inca/include
//-------------

//-- switch add to ncsim
-sv_lib ./src/test_sv/libdpi.so
//------------

Run simulation and output:
ncsim: 05.83-s003: (c) Copyright 1995-2007 Cadence Design Systems, Inc.
snapshot worklib.top:module (SSS) is up to date (no update required).
Loading snapshot worklib.top:module .................... Done
ncsim: *W,NOLDPI: Unable to load ./src/test_sv/libdpi.so.
OSDLERROR: /cad/cadence/IUS583-s003-linux/tools.lnx86/lib/libgcc_s.so.1: version cannot open shared object file: No such file or directory or file is not valid ELFCLASS32 library..
ncsim: *F,NOFDPI: Function sum not found in any of the shared object specified with -SV_LIB switch.
ncsim: Memory Usage - 17.9M program + 10.4M data = 28.3M total
ncsim: CPU Usage - 0.0s system + 0.1s user = 0.2s total (1.0s, 15.8% cpu)

Best regards,
Davy