Exclude the datamodel.h header from being added to ROOT dictionaries

cmake/podioMacros.cmake

@@ -252,6 +252,20 @@ function(PODIO_ADD_ROOT_IO_DICT dict_name CORE_LIB HEADERS SELECTION_XML)
   # the core headers
   LIST(FILTER HEADERS EXCLUDE REGEX .*SIOBlock.h)
   LIST(FILTER HEADERS EXCLUDE REGEX .*ArrowMapper.h)
+  # Exclude the datamodel header (e.g. edm4hep.h)
+  # since it will include everything and include guards will be set
+  # causing clashes with Link type aliases at runtime.
+  # Find patters like datamodel/datamodel.h or edm4hep/edm4hep.h
+  # to exclude them
+  foreach(_header ${HEADERS})
+    get_filename_component(_header_stem ${_header} NAME_WE)
+    get_filename_component(_header_dir ${_header} DIRECTORY)
+    get_filename_component(_parent_name ${_header_dir} NAME)
+    if(_header_stem STREQUAL _parent_name)
+      list(REMOVE_ITEM HEADERS ${_header})
+      break()
+    endif()
+  endforeach()
 
   add_library(${dict_name} SHARED)
   target_link_libraries(${dict_name} PUBLIC

cmake/podioTest.cmake

@@ -37,7 +37,7 @@ endif()
 #   preloaded via LD_PRELOAD so that cling can dlopen instrumented shared
 #   libraries in case a sanitizer has been enabled for the build.
 function(PODIO_SET_TEST_ENV test)
-  cmake_parse_arguments(PARSE_ARGV 1 ARG "PYTHON" "" "")
+  cmake_parse_arguments(PARSE_ARGV 1 ARG "PYTHON;CLING" "" "")
   # We need to convert this into a list of arguments that can be used as environment variable
   list(JOIN PODIO_IO_HANDLERS " " IO_HANDLERS)
   set(test_environment
@@ -64,7 +64,7 @@ function(PODIO_SET_TEST_ENV test)
     )
   endif()
   # Preload the sanitizer runtime so cling can dlopen instrumented libraries
-  if(ARG_PYTHON AND PODIO_SANITIZER_LIBRARY)
+  if((ARG_PYTHON OR ARG_CLING) AND PODIO_SANITIZER_LIBRARY)
     list(APPEND test_environment "LD_PRELOAD=${PODIO_SANITIZER_LIBRARY}:$ENV{LD_PRELOAD}")
   endif()
   set_property(TEST ${test}

tests/CTestCustom.cmake

@@ -107,6 +107,8 @@ if ((NOT "@FORCE_RUN_ALL_TESTS@" STREQUAL "ON") AND (NOT "@USE_SANITIZER@" STREQ
       podio-dump-rntuple
       podio-dump-detailed-rntuple
 
+      root_test_macro
+
       datamodel_def_store_roundtrip_rntuple
       datamodel_def_store_roundtrip_rntuple_extension
 

tests/root_io/CMakeLists.txt

@@ -128,7 +128,10 @@ PODIO_SET_TEST_ENV(param_reading_rdataframe PYTHON)
 set_tests_properties(param_reading_rdataframe PROPERTIES FIXTURES_REQUIRED podio_write_root_fixture)
 
 if(ENABLE_DATASOURCE)
-  add_test(NAME read_python_with_rdatasource_root COMMAND python3 ${PROJECT_SOURCE_DIR}/tests/root_io/read_datasource.py)
-  PODIO_SET_TEST_ENV(read_python_with_rdatasource_root PYTHON)
-  set_tests_properties(read_python_with_rdatasource_root PROPERTIES FIXTURES_REQUIRED podio_write_root_fixture)
-endif()
+   add_test(NAME read_python_with_rdatasource_root COMMAND python3 ${PROJECT_SOURCE_DIR}/tests/root_io/read_datasource.py)
+   PODIO_SET_TEST_ENV(read_python_with_rdatasource_root PYTHON)
+   set_tests_properties(read_python_with_rdatasource_root PROPERTIES FIXTURES_REQUIRED podio_write_root_fixture)
+ endif()
+
+add_test(NAME root_test_macro COMMAND root -l -b -q ${CMAKE_CURRENT_SOURCE_DIR}/test_root_macro.C)
+PODIO_SET_TEST_ENV(root_test_macro CLING)

tests/root_io/test_root_macro.C

@@ -0,0 +1,42 @@
+#include "datamodel/ExampleClusterCollection.h"
+#include "datamodel/ExampleHitCollection.h"
+#include "datamodel/TestLinkCollection.h"
+
+#include <iostream>
+#include <stdexcept>
+
+void test_root_macro() {
+  auto success = true;
+  const auto check = [&success](const char* name, const auto& actual, const auto& expected) {
+    if (actual == expected) {
+      return;
+    }
+
+    std::cerr << "test_root_macro: " << name << " failed: expected " << expected << ", got " << actual << '\n';
+    success = false;
+  };
+
+  // Link collection
+  auto linkCol = TestLinkCollection{};
+  auto link = linkCol.create();
+  link.setWeight(0.5);
+  check("link weight", link.getWeight(), 0.5);
+  check("link collection size", linkCol.size(), 1u);
+
+  // Regular datatype collections
+  auto hitCol = ExampleHitCollection{};
+  auto hit = hitCol.create();
+  hit.energy(42.0);
+  check("hit energy", hit.energy(), 42.0);
+  check("hit collection size", hitCol.size(), 1u);
+
+  auto clusterCol = ExampleClusterCollection{};
+  auto cluster = clusterCol.create();
+  cluster.energy(7.0);
+  check("cluster energy", cluster.energy(), 7.0);
+  check("cluster collection size", clusterCol.size(), 1u);
+
+  if (!success) {
+    throw std::runtime_error("test_root_macro failed");
+  }
+}