Drop the internal vendored version of TinyXML2

Signed-off-by: Michael Carroll <mjcarroll@intrinsic.ai>

CMakeLists.txt

@@ -32,16 +32,6 @@ if(WIN32)
     false)
 endif()
 
-#--------------------------------------
-# Option: Should we use our internal copy of tinyxml2?
-if(UNIX OR APPLE)
-  option(USE_EXTERNAL_TINYXML2 "Use a system-installed version of tinyxml2" ON)
-elseif(WIN32)
-  # For backward compatibility, this option on Windows by default is OFF
-  option(USE_EXTERNAL_TINYXML2 "Use a system-installed version of tinyxml2" OFF)
-endif()
-
-
 #============================================================================
 # Search for project-specific dependencies
 #============================================================================
@@ -59,13 +49,9 @@ set(GZ_UTILS_VER ${gz-utils2_VERSION_MAJOR})
 
 #--------------------------------------
 # Find Tinyxml2
-if(USE_EXTERNAL_TINYXML2)
-  gz_find_package(TINYXML2 PRETTY tinyxml2
-    REQUIRED_BY graphics
-    PRIVATE_FOR graphics)
-else()
-  message(STATUS "Skipping search for tinyxml2 and using an internal version\n")
-endif()
+gz_find_package(TINYXML2 PRETTY tinyxml2
+  REQUIRED_BY graphics
+  PRIVATE_FOR graphics)
 
 #--------------------------------------
 # Find dependencies that we ignore for Visual Studio

graphics/src/CMakeLists.txt

@@ -39,47 +39,14 @@ if(${GzAssimp_VERSION} STRLESS "5.2.0")
 endif()
 
 
-if(USE_EXTERNAL_TINYXML2)
-
-  # If we are using an external copy of tinyxml2, add its imported target
-  target_link_libraries(${graphics_target}
-    PRIVATE
-      TINYXML2::TINYXML2)
-
-    # The collada exporter test uses tinyxml2, so we must link it if we're using
-    # an external copy. The graphics target considers tinyxml2 to be a private
-    # dependency, so it will not automatically get linked to this test.
-    if(TARGET UNIT_ColladaExporter_TEST)
-      target_link_libraries(UNIT_ColladaExporter_TEST TINYXML2::TINYXML2)
-    endif()
-
-else()
-
-  # Otherwise, add its source directory to our target's PRIVATE include
-  # directories. We do not want this to be visible to consumers of
-  # gz-common.
-  target_include_directories(${graphics_target}
-    PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/tinyxml2)
-
-  if(TARGET UNIT_ColladaExporter_TEST)
-
-    # If we are using the internal copy of tinyxml2, then the collada exporter
-    # test needs to be pointed to the internal tinyxml2 include directory.
-    target_include_directories(UNIT_ColladaExporter_TEST PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/tinyxml2)
-    # We also need to add this as a source file to the collada exporter test's
-    # target, because we do not export the tinyxml2 symbols that get generated
-    # in the gz-common library. Therefore, the collada exporter test
-    # cannot link to those symbols and must generate its own.
-    target_sources(UNIT_ColladaExporter_TEST PRIVATE tinyxml2/tinyxml2.cpp)
-
-  endif()
-
-endif()
+# If we are using an external copy of tinyxml2, add its imported target
+target_link_libraries(${graphics_target}
+  PRIVATE
+    TINYXML2::TINYXML2)
 
-# define of tinxml2 major version >= 6
-# https://github.com/gazebosim/gz-common/issues/28
-if (NOT TINYXML2_VERSION VERSION_LESS "6.0.0")
-  message(STATUS "TINYXML2_VERSION ${TINYXML2_VERSION} >= 6.0.0")
-  target_compile_definitions(${graphics_target}
-    PRIVATE "TINYXML2_MAJOR_VERSION_GE_6")
+# The collada exporter test uses tinyxml2, so we must link it if we're using
+# an external copy. The graphics target considers tinyxml2 to be a private
+# dependency, so it will not automatically get linked to this test.
+if(TARGET UNIT_ColladaExporter_TEST)
+  target_link_libraries(UNIT_ColladaExporter_TEST TINYXML2::TINYXML2)
 endif()