Make MCPL a Runtime Optional Dependency

CMakeLists.txt

@@ -36,7 +36,6 @@ option(OPENMC_ENABLE_COVERAGE "Compile with coverage analysis flags"
 option(OPENMC_USE_DAGMC       "Enable support for DAGMC (CAD) geometry"              OFF)
 option(OPENMC_USE_LIBMESH     "Enable support for libMesh unstructured mesh tallies" OFF)
 option(OPENMC_USE_MPI         "Enable MPI"                                           OFF)
-option(OPENMC_USE_MCPL        "Enable MCPL"                                          OFF)
 option(OPENMC_USE_UWUW        "Enable UWUW"                                          OFF)
 
 message(STATUS "OPENMC_USE_OPENMP ${OPENMC_USE_OPENMP}")
@@ -46,7 +45,6 @@ message(STATUS "OPENMC_ENABLE_COVERAGE ${OPENMC_ENABLE_COVERAGE}")
 message(STATUS "OPENMC_USE_DAGMC ${OPENMC_USE_DAGMC}")
 message(STATUS "OPENMC_USE_LIBMESH ${OPENMC_USE_LIBMESH}")
 message(STATUS "OPENMC_USE_MPI ${OPENMC_USE_MPI}")
-message(STATUS "OPENMC_USE_MCPL ${OPENMC_USE_MCPL}")
 message(STATUS "OPENMC_USE_UWUW ${OPENMC_USE_UWUW}")
 
 # Warnings for deprecated options
@@ -189,22 +187,6 @@ if(${HDF5_VERSION} VERSION_GREATER_EQUAL 1.12.0)
   list(APPEND cxxflags -DH5Oget_info_by_idx_vers=1 -DH5O_info_t_vers=1)
 endif()
 
-#===============================================================================
-# MCPL
-#===============================================================================
-
-if (OPENMC_USE_MCPL)
-  if (NOT DEFINED MCPL_DIR)
-    execute_process(
-      COMMAND mcpl-config --show cmakedir
-      OUTPUT_VARIABLE MCPL_DIR
-      OUTPUT_STRIP_TRAILING_WHITESPACE
-    )
-  endif()
-  find_package(MCPL REQUIRED)
-  message(STATUS "Found MCPL: ${MCPL_DIR} (found version \"${MCPL_VERSION}\")")
-endif()
-
 #===============================================================================
 # Set compile/link flags based on which compiler is being used
 #===============================================================================
@@ -535,11 +517,6 @@ if (OPENMC_BUILD_TESTS)
   add_subdirectory(tests/cpp_unit_tests)
 endif()
 
-if (OPENMC_USE_MCPL)
-  target_compile_definitions(libopenmc PUBLIC OPENMC_MCPL)
-  target_link_libraries(libopenmc MCPL::mcpl)
-endif()
-
 #===============================================================================
 # Log build info that this executable can report later
 #===============================================================================

cmake/OpenMCConfig.cmake.in

@@ -29,10 +29,6 @@ if(@OPENMC_USE_OPENMP@)
   find_package(OpenMP REQUIRED)
 endif()
 
-if(@OPENMC_USE_MCPL@)
-  find_package(MCPL REQUIRED HINTS @MCPL_DIR@)
-endif()
-
 if(@OPENMC_USE_UWUW@ AND NOT ${DAGMC_BUILD_UWUW})
   message(FATAL_ERROR "UWUW is enabled in OpenMC but the DAGMC installation discovered was not configured with UWUW.")
 endif()

docs/source/usersguide/install.rst

@@ -368,10 +368,6 @@ OPENMC_USE_DAGMC
   should also be defined as `DAGMC_ROOT` in the CMake configuration command.
   (Default: off)
 
-OPENMC_USE_MCPL
-  Turns on support for reading MCPL_ source files and writing MCPL source points
-  and surface sources. (Default: off)
-
 OPENMC_USE_LIBMESH
   Enables the use of unstructured mesh tallies with libMesh_. (Default: off)
 

include/openmc/mcpl_interface.h

@@ -9,12 +9,6 @@
 
 namespace openmc {
 
-//==============================================================================
-// Constants
-//==============================================================================
-
-extern "C" const bool MCPL_ENABLED;
-
 //==============================================================================
 // Functions
 //==============================================================================
@@ -29,14 +23,18 @@ vector<SourceSite> mcpl_source_sites(std::string path);
 //
 //! \param[in] filename     Path to MCPL file
 //! \param[in] source_bank  Vector of SourceSites to write to file for this
-//!                         MPI rank. Note that this can't be const due to
-//!                         it being used as work space by MPI.
-//! \param[in] bank_indx    Pointer to vector of site index ranges over all
-//!                         MPI ranks. This can be computed by calling
-//!                         calculate_parallel_index_vector on
-//!                         source_bank.size().
+//!                         MPI rank.
+//! \param[in] bank_index   Pointer to vector of site index ranges over all
+//!                         MPI ranks.
 void write_mcpl_source_point(const char* filename, span<SourceSite> source_bank,
   const vector<int64_t>& bank_index);
+
+//! Check if MCPL functionality is available
+bool is_mcpl_interface_available();
+
+//! Initialize the MCPL interface
+void initialize_mcpl_interface_if_needed();
+
 } // namespace openmc
 
-#endif // OPENMC_MCPL_INTERFACE_H
+#endif // OPENMC_MCPL_INTERFACE_H

openmc/lib/__init__.py

@@ -46,9 +46,6 @@ def _coord_levels():
 def _libmesh_enabled():
     return c_bool.in_dll(_dll, "LIBMESH_ENABLED").value
 
-def _mcpl_enabled():
-    return c_bool.in_dll(_dll, "MCPL_ENABLED").value
-
 def _uwuw_enabled():
     return c_bool.in_dll(_dll, "UWUW_ENABLED").value