[CMake] Reason of Fortran include directories /config?

[Petr Kmoch]

Hi all,

we're using cmake to generate Intel Fortran .vfproj files and some of
my developers were asking why include directories in the project
always include X and X/<config_name> for every directory X specified
via include_directories(). Looking at cmake source code, the lines
responsible seem to be 829-837 of cmLocalVisualStudio7Generator.cxx
(in the 2.8.8 released archive):

// if this is fortran then output the include with
// a ConfigurationName on the end of it.
if(this->FortranProject)
  {
  ipath = i->c_str();
  ipath += "/$(ConfigurationName)";
  ipath = this->ConvertToXMLOutputPath(ipath.c_str());
  fout << ipath << ";";
  }
}

I would be really interested in the reason for this behaviour. Could
anyone shed some light onto this for me?

Thanks in advance.

Petr