Including Partial Paths to C++ Header Files with Legacy Code Tool

Hello,

I have a problem with getting the legacy code tool to work properly. I have a C++ codebase with the following file structure:

Note that my_lib is inside my working directory. I am using the Legacy Code Tool to create a Simulink function that calls my_lib/src/my_func.cpp. The function has the following include directives:

#include "my_lib/my_func.hpp"

If this was soley a C++ project, I would create a CMakeLists.txt file with the "my_lib/include/" directory to get the compiler to understand where to look for these header file. I have attempted to provide a similar thing to the Legacy Code Tool via the following commands:

def = legacy_code('initialize');

% add the include and source paths

lib_name = 'my_lib';

incPath = [lib_name '/' 'include'];

srcPath = [lib_name '/' 'src'];

def.IncPaths = {incPath};

def.SrcPaths = {srcPath};

% add the include and source files

def.SourceFiles = {'my_func.cpp'};

def.HeaderFiles = {'my_func.hpp'};

% name the SFunction specs (used by simulink)

def.SFunctionName = 'sfun_my_func';

def.OutputFcnSpec = 'single y1 = my_func(single u1, single u2, single u3)';

def.Options.language = 'C++';

% generate the mex function and compile the code

legacy_code('sfcn_cmex_generate', def);

legacy_code('compile', def);

However, this fails due to the fact that the resulting "sfun_my_func.cpp" file is created in the working directory with the header file #include "my_func.hpp" rather than the (expected) #include "my_lib/include/my_lib/my_func.hpp".

With all of this in mind, how can I get the Legacy Code Tool to work without changing the filestructure nor the include directives in my_func.cpp?

Thank you in advance for your time and I look forward to anyone's advice on this matter.

Answer 1

[Varun]

Hi Justin,

I understand that "my_func.hpp" is in directory "my_lib/include/my_lib/" and still generated file "sfun_my_func.cpp" has included this header as #include "my_func.hpp" rather than #include "my_lib/include/my_lib/my_func.hpp".

Actually, #include "my_func.hpp" is the correct because you have already defined as:

incPath = [lib_name '/' 'include'];  
def.IncPaths = {incPath};  

And when mex compiler will compile the sfun_my_func.cpp, “my_lib/include/my_lib/" will be added into the the list of directories to search for header files by “legacy code tool”, so no need to use #include "my_lib/include/my_lib/my_func.hpp" and #include "my_func.hpp" is enough.

You can also notice this on command window as:

### Start Compiling sfun_my_func.cpp

mex(‘–I<absolute path of my_lib/include/my_lib/>’,...)