Merge branch 'cmake-boost-python' into 'master'

Update CMake boost python logic and std::filesystem usage

See merge request !319

CMakeLists.txt

@@ -652,9 +652,14 @@ else()
   list ( APPEND waLBerla_OPTIONAL_BOOST_COMPONENTS system )
 endif()
 
-if ( WALBERLA_BUILD_WITH_PYTHON AND WALBERLA_CXX_COMPILER_IS_MSVC )
+if ( WALBERLA_BUILD_WITH_PYTHON )
+  if( WALBERLA_CXX_COMPILER_IS_MSVC )
     get_filename_component(PYTHON_REQUIRED_LIB ${PYTHON_LIBRARY} NAME_WE)
     list( APPEND waLBerla_REQUIRED_BOOST_COMPONENTS ${PYTHON_REQUIRED_LIB} )
+  elseif( WALBERLA_USE_STD_FILESYSTEM OR WALBERLA_USE_STD_EXPERIMENTAL_FILESYSTEM )
+    list( APPEND waLBerla_REQUIRED_BOOST_COMPONENTS system )
+    list( REMOVE_ITEM waLBerla_OPTIONAL_BOOST_COMPONENTS system )
+  endif()
 endif()
 
 # This variable is necessary, if the CMAKE version used is not aware of a more recent boost version (keep this up to date!)
@@ -749,11 +754,13 @@ if ( WALBERLA_BUILD_WITH_PYTHON AND NOT WALBERLA_CXX_COMPILER_IS_MSVC)
         SET(_boost_MULTITHREADED "-mt")
     endif()
     if( PYTHON_LIBRARY MATCHES "python3" )
+        string(REPLACE "." ";" VERSION_LIST ${PYTHONLIBS_VERSION_STRING})
+        list(GET VERSION_LIST 0 PY_VER_MAJOR)
+        list(GET VERSION_LIST 1 PY_VER_MINOR)
         find_library( BOOST_PYTHON_LIBRARY NAMES
-                boost_python37${_boost_MULTITHREADED} boost_python36${_boost_MULTITHREADED} boost_python35${_boost_MULTITHREADED}
-                boost_python-py37${_boost_MULTITHREADED} boost_python-py36${_boost_MULTITHREADED} boost_python-py35${_boost_MULTITHREADED}
-                boost_python-py34${_boost_MULTITHREADED} boost_python-py33${_boost_MULTITHREADED}
-                boost_python3${_boost_MULTITHREADED}
+                boost_python${PY_VER_MAJOR}${PY_VER_MINOR}${_boost_MULTITHREADED}
+                boost_python-py${PY_VER_MAJOR}${PY_VER_MINOR}${_boost_MULTITHREADED}
+                boost_python${PY_VER_MAJOR}${_boost_MULTITHREADED}
                 boost_python${_boost_MULTITHREADED}
                 PATHS ${Boost_LIBRARY_DIRS} NO_DEFAULT_PATH )
     else()

src/python_coupling/PythonCallback.cpp

@@ -77,17 +77,21 @@ namespace python_coupling {
 
       std::string cwd(cwd_buf);
       std::free(cwd_buf);
+      path = filesystem::absolute( path, cwd );
 #else
-      filesystem::path cwd = filesystem::current_path();
+      path = filesystem::absolute( path );
 #endif
-      path = filesystem::absolute( path, cwd );
       if ( path.extension() == ".py" )
       {
          moduleName = path.stem().string();
 
 
          if ( ! path.parent_path().empty() )  {
+#ifdef CURRENT_PATH_WORKAROUND
             std::string p = filesystem::canonical(path.parent_path(), cwd).string();
+#else
+            std::string p = filesystem::canonical(path.parent_path()).string();
+#endif
             code << "sys.path.append( r'" << p << "')" << "\n";
          }
       }