Remove C++ support and cpp2py dependency

C++ code has been completely removed from the codebase. This commit
removes all related CMake configuration:

- Remove PythonSupport option (Python is now always built)
- Remove cpp2py dependency from deps/CMakeLists.txt
- Remove cpp2py module building logic from python/triqs_dft_tools/
- Remove wrap_generators handling (no *_desc.py files exist)
- Update project description to remove cpp2py reference

The project now builds Python-only components without conditional
C++ support checks.

Author: the-hampel

CMakeLists.txt

@@ -1,6 +1,6 @@
 # ##############################################################################
 #
-# triqs_dft_tools - An example application using triqs and cpp2py
+# triqs_dft_tools - An example application using triqs
 #
 # Copyright (C) ...
 #
@@ -28,7 +28,7 @@ project(triqs_dft_tools VERSION 3.3.1 LANGUAGES C CXX Fortran)
 get_directory_property(IS_SUBPROJECT PARENT_DIRECTORY)
 
 # ############
-# Load TRIQS and CPP2PY
+# Load TRIQS
 find_package(TRIQS 3.3 REQUIRED)
 
 # Get the git hash & print status
@@ -66,17 +66,8 @@ if(NOT IS_SUBPROJECT)
   message(STATUS "-------- BUILD-TYPE: ${CMAKE_BUILD_TYPE} --------")
 endif()
 
-# Python Support
-option(PythonSupport "Build with Python support" ON)
-if(PythonSupport AND NOT TRIQS_WITH_PYTHON_SUPPORT)
-  message(FATAL_ERROR "TRIQS was installed without Python support. Cannot build the Python Interface. Disable the build with -DPythonSupport=OFF")
-endif()
-
 # Documentation
 option(Build_Documentation "Build documentation" OFF)
-if(NOT IS_SUBPROJECT AND (Build_Documentation AND NOT PythonSupport))
-  message(FATAL_ERROR "Build_Documentation=ON requires PythonSupport to be enabled")
-endif()
 
 # Testing
 option(Build_Tests "Build tests" ON)
@@ -140,9 +131,7 @@ if(Build_Tests)
 endif()
 
 # Python
-if(PythonSupport)
-  add_subdirectory(python/${PROJECT_NAME})
-endif()
+add_subdirectory(python/${PROJECT_NAME})
 
 # Docs
 if(NOT IS_SUBPROJECT AND Build_Documentation)

deps/CMakeLists.txt

@@ -47,17 +47,6 @@ else()
   endif()
 endif()
 
-# -- Cpp2Py --
-if(PythonSupport OR (NOT IS_SUBPROJECT AND Build_Documentation))
-  external_dependency(Cpp2Py
-    GIT_REPO https://github.com/TRIQS/cpp2py
-    VERSION 3.3
-    GIT_TAG main
-    BUILD_ALWAYS
-    EXCLUDE_FROM_ALL
-  )
-endif()
-
 # -- GTest --
 external_dependency(GTest
   GIT_REPO https://github.com/google/googletest

python/triqs_dft_tools/CMakeLists.txt

@@ -3,7 +3,6 @@ configure_file(version.py.in version.py)
 
 # All Python files. Copy them in the build dir to have a complete package for the tests.
 file(GLOB_RECURSE python_sources RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.py)
-list(REMOVE_ITEM python_sources "${wrap_generators}")
 foreach(file ${python_sources})
   configure_file(${file} ${file} COPYONLY)
 endforeach()
@@ -12,14 +11,3 @@ endforeach()
 set(PYTHON_LIB_DEST ${TRIQS_PYTHON_LIB_DEST_ROOT}/${PROJECT_NAME})
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/version.py DESTINATION ${PYTHON_LIB_DEST})
 install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} DESTINATION ${TRIQS_PYTHON_LIB_DEST_ROOT} FILES_MATCHING PATTERN "*.py" PATTERN "*_desc.py" EXCLUDE)
-
-# Build and install any python modules
-foreach(gen ${wrap_generators})
-  string(REPLACE "_desc.py" "" gen ${gen})
-  get_filename_component(module_name ${gen} NAME_WE)
-  get_filename_component(module_dir ${gen} DIRECTORY)
-  add_cpp2py_module(NAME ${module_name} DIRECTORY ${module_dir})
-  add_library(${PROJECT_NAME}::${module_name} ALIAS ${module_name})
-  target_link_libraries(${module_name} ${PROJECT_NAME}_c triqs_py)
-  install(TARGETS ${module_name} DESTINATION ${PYTHON_LIB_DEST}/${module_dir})
-endforeach()

share/CMakeLists.txt

@@ -6,10 +6,8 @@ if(NOT IS_SUBPROJECT
   AND NOT CMAKE_INSTALL_PREFIX STREQUAL "/usr/local"
 )
 
-  if(PythonSupport)
-    set(EXPORT_PYTHON_PATH "export PYTHONPATH=${CMAKE_INSTALL_PREFIX}/${CPP2PY_PYTHON_LIB_DEST_ROOT}:$PYTHONPATH")
-    set(MODFILE_PYTHON_PATH "prepend-path    PYTHONPATH          $root/${CPP2PY_PYTHON_LIB_DEST_ROOT}")
-  endif()
+  set(EXPORT_PYTHON_PATH "export PYTHONPATH=${CMAKE_INSTALL_PREFIX}/${CPP2PY_PYTHON_LIB_DEST_ROOT}:$PYTHONPATH")
+  set(MODFILE_PYTHON_PATH "prepend-path    PYTHONPATH          $root/${CPP2PY_PYTHON_LIB_DEST_ROOT}")
 
   configure_file(${PROJECT_NAME}.modulefile.in ${PROJECT_NAME}.modulefile @ONLY)
   configure_file(${PROJECT_NAME}vars.sh.in ${PROJECT_NAME}vars.sh @ONLY)

test/CMakeLists.txt

@@ -1,6 +1,3 @@
-
-if(PythonSupport)
- add_subdirectory(python)
- add_subdirectory(python/plovasp)
- add_subdirectory(python/elk)
-endif()
+add_subdirectory(python)
+add_subdirectory(python/plovasp)
+add_subdirectory(python/elk)