using OLB with multiple cpp files

[jackyko]

hi I am creating a very simple program try to include OLB headers, but some definition errors raises:

my program includes 3 files:

Code:

// main.cpp
#include “iostream”
#include “a.h”

using namespace std;

int main()
{
PrintHello();
}

Code:

// a.h
#ifndef A_H
#define A_H

#include “iostream”
#include “olb3D.h”
#include “olb3D.hh”

void PrintHello();

#endif

Code:

// a.cpp
#include “a.h”

using namespace std;

void PrintHello()
{
cout << “hello” <<endl;
}

compile the above code:

Code:

g++ -c main.cpp a.cpp -I ./ -I [path_to_olb.h]

still fine at this stage, but when i try to link the library to the final binary, error comes

Code:

g++ main.o a.o -o main -L [path_to_prebuilt_lib] -l olb

error comes out as for multiple defintion

Code:

a.o:(.bss+0x0): multiple definition of `olb::XMLreader::notFound’
main.o:(.bss+0x0): first defined here
a.o: In function `olb::XMLreader::XMLreader()’:
a.cpp:(.text+0x0): multiple definition of `olb::XMLreader::XMLreader()’
main.o:main.cpp:(.text+0x0): first defined here
a.o: In function `olb::XMLreader::XMLreader()’:
a.cpp:(.text+0x0): multiple definition of `olb::XMLreader::XMLreader()’
main.o:main.cpp:(.text+0x0): first defined here
a.o: In function `olb::XMLreader::XMLreader(TiXmlNode*)’:
a.cpp:(.text+0x162): multiple definition of `olb::XMLreader::XMLreader(TiXmlNode*)’
main.o:main.cpp:(.text+0x162): first defined here
a.o: In function `olb::XMLreader::mainProcessorIni(TiXmlNode*)’:
a.cpp:(.text+0x6a4): multiple definition of `olb::XMLreader::mainProcessorIni(TiXmlNode*)’
main.o:main.cpp:(.text+0x6a4): first defined here
a.o: In function `olb::XMLreader::slaveProcessorIni()’:
a.cpp:(.text+0x896): multiple definition of `olb::XMLreader::slaveProcessorIni()’
main.o:main.cpp:(.text+0x896): first defined here
a.o: In function `olb::XMLreader::XMLreader(TiXmlNode*)’:
a.cpp:(.text+0x162): multiple definition of `olb::XMLreader::XMLreader(TiXmlNode*)’
main.o:main.cpp:(.text+0x162): first defined here
a.o: In function `olb::XMLreader::XMLreader(std::string const&)’:
a.cpp:(.text+0x2e8): multiple definition of `olb::XMLreader::XMLreader(std::string const&)’
main.o:main.cpp:(.text+0x2e8): first defined here
a.o: In function `olb::XMLreader::XMLreader(std::string const&)’:
a.cpp:(.text+0x2e8): multiple definition of `olb::XMLreader::XMLreader(std::string const&)’
main.o:main.cpp:(.text+0x2e8): first defined here
a.o: In function `olb::XMLreader::~XMLreader()’:
a.cpp:(.text+0x566): multiple definition of `olb::XMLreader::~XMLreader()’
main.o:main.cpp:(.text+0x566): first defined here
a.o: In function `olb::XMLreader::~XMLreader()’:
a.cpp:(.text+0x566): multiple definition of `olb::XMLreader::~XMLreader()’
main.o:main.cpp:(.text+0x566): first defined here
a.o: In function `olb::XMLreader::print(int) const’:
a.cpp:(.text+0x912): multiple definition of `olb::XMLreader::print(int) const’
main.o:main.cpp:(.text+0x912): first defined here
a.o: In function `olb::XMLreader::operator[](std::string) const’:
a.cpp:(.text+0xaa6): multiple definition of `olb::XMLreader::operator[](std::string) const’
main.o:main.cpp:(.text+0xaa6): first defined here
a.o: In function `olb::XMLreader::begin() const’:
a.cpp:(.text+0xb8a): multiple definition of `olb::XMLreader::begin() const’
main.o:main.cpp:(.text+0xb8a): first defined here
a.o: In function `olb::XMLreader::end() const’:
a.cpp:(.text+0xbaa): multiple definition of `olb::XMLreader::end() const’
main.o:main.cpp:(.text+0xbaa): first defined here
a.o: In function `olb::XMLreader::getName() const’:
a.cpp:(.text+0xbca): multiple definition of `olb::XMLreader::getName() const’
main.o:main.cpp:(.text+0xbca): first defined here
a.o: In function `olb::XMLreader::setWarningsOn(bool) const’:
a.cpp:(.text+0xbf8): multiple definition of `olb::XMLreader::setWarningsOn(bool) const’
main.o:main.cpp:(.text+0xbf8): first defined here
a.o: In function `bool olb::XMLreader::read<bool>(bool&, bool) const’:
a.cpp:(.text+0xc72): multiple definition of `bool olb::XMLreader::read<bool>(bool&, bool) const’
main.o:main.cpp:(.text+0xc72): first defined here
a.o: In function `bool olb::XMLreader::read<int>(int&, bool) const’:
a.cpp:(.text+0xefc): multiple definition of `bool olb::XMLreader::read<int>(int&, bool) const’
main.o:main.cpp:(.text+0xefc): first defined here
a.o: In function `bool olb::XMLreader::read<double>(double&, bool) const’:
a.cpp:(.text+0x109e): multiple definition of `bool olb::XMLreader::read<double>(double&, bool) const’
main.o:main.cpp:(.text+0x109e): first defined here
a.o: In function `bool olb::XMLreader::read<std::string>(std::string&, bool) const’:
a.cpp:(.text+0x1244): multiple definition of `bool olb::XMLreader::read<std::string>(std::string&, bool) const’
main.o:main.cpp:(.text+0x1244): first defined here
a.o: In function `olb::XMLreader::getAttribute(std::string const&) const’:
a.cpp:(.text+0x1298): multiple definition of `olb::XMLreader::getAttribute(std::string const&) const’
main.o:main.cpp:(.text+0x1298): first defined here
collect2: error: ld returned 1 exit status

I would like to refactor the code in multiple files, my program work in single .cpp file but it is too long for a further development. Any help?

[albert.mink]

Dear,

I am curious about your goal of including header of OpenLB. Do you want to use OpenLB Functions in your application or extend OpenLB by own code?

Regards,
Albert

[jackyko]

I am embedding the OpenLB with my own applications. The program involves an automatic vessel segmentation scheme and boundary setting part. I have finished the code in a single CPP file in reference with aorta3D example.

The above 3 files is a simplify version of my designed framework for further development.

[Author]

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