add_executable cannot create target, another target with the same namea exist.

[baymin]

Hello.

When I was following the documentation on the Internet and I was doing
the “Programming with SOFA”/”Start coding”, there were something wrong
with my plugins.

At first, It was always showing this:

CMake Error at CMakeLists.txt:15 (find_package):
  By not providing "FindSofaFramework.cmake" in CMAKE_MODULE_PATH this
  project has asked CMake to find a package configuration file provided by
  "SofaFramework", but CMake did not find one.

Then I dealt it like this:

cmake -DCMAKE_PREFIX_PATH=/home/baymin/sofa/lib/cmake

And it showed that:

CMake Error at CMakeLists.txt:28 (add_executable):
  add_executable cannot create target "MyPlugin" because another target with
  the same name already exists.  The existing target is a shared library
  created in source directory
  "/home/baymin/sofa/src/applications/plugins/MyPlugin".  See
  documentation for policy CMP0002 for more details.

So what should I do to build my plugins?

Thank you very much.

Best,

Baymin

[baymin]

Hi,

I found my mistake about building my plugins from the tutorial. Build a package in sofa/applications/plugins, and then add “sofa_add_plugin” into the CMakeList.txt in plugins. By using “cmake-gui ../../src” I can select my plugin package, and use “make” to build it.

But there are some new problems:

SofaComponentAdvanced/initComponentAdvanced.h: No such file or directory

Then I copy the “sofa/modules” into “sofa/SofaKernel/modules” and new problems appear:

In function ‘int main(int, char**)’:
error: ‘ExecParams’ has not been declared
     ExecParams::defaultInstance()->setAspectID(0);
error: ‘GNode’ is not a member of ‘sofa::simulation::tree’
     sofa::simulation::tree::GNode* groot = new sofa::simulation::tree::GNode;
...

I copied the Main.cpp from the docmetation:

Write a scene in Cpp

So how can I build my own plugins.

Thank you very much.

Best,

Baymin

[baymin]

Hi,

I had put my plugin package into “sofa/applications/projects”, and then add “sofa_add_plugin” into the CMakeList.txt in “sofa/applications/projects”. By using “cmake-gui ../../src” and use “make” to build it.

The problems cannot find “*.h” files had been solved, but there are some new problems again:

In file included from sofa/applications/projects/MyPlugin/Main.cpp:17:0:
sofa/SofaKernel/SofaCommon/../modules/SofaSimulationTree/GNode.h: In function ‘int main(int, char**)’:
sofa/SofaKernel/SofaCommon/../modules/SofaSimulationTree/GNode.h:48:5: error: ‘sofa::simulation::tree::GNode::GNode(const string&, sofa::simulation::tree::GNode*)’ is protected
     GNode( const std::string& name="", GNode* parent=NULL  );
     ^
sofa/applications/projects/MyPlugin/Main.cpp:57:72: error: within this context
     sofa::simulation::tree::GNode* groot = new sofa::simulation::tree::GNode;
                                                                        ^
sofa/applications/projects/MyPlugin/Main.cpp:60:12: error: ‘class sofa::simulation::tree::GNode’ has no member named ‘setGravityInWorld’
     groot->setGravityInWorld(g);
            ^
sofa/applications/projects/MyPlugin/Main.cpp:72:51: error: request for member ‘get’ in ‘groot’, which is of pointer type ‘sofa::simulation::tree::GNode*’ (maybe you meant to use ‘->’ ?)
     sofa::simulation::getSimulation()->init(groot.get());

I had use “grep” to find the function setGravityInWorld and could not find the definition of “setGravityInWorld”. So how can I build my own plugins and run them.

Thank you very much.

Best,

Baymin

[Hugo]

Sorry for the delay of reply @baymin !!

Regarding the online documentation, you can update yourself when you find any issue/incorrect info. The documentation is Markdown files versioned on a Git repo :
https://github.com/sofa-framework/doc
Anyone can contribute (pull-request) !

Your main issue is that you try to access a GNode line 17 of your Main.cpp which is protected. You can get inspired of the Main.cpp of the runSofa project in “sofa/applications/projects”“.

I hope this helps.
Best regards,

Hugo

[Author]

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