Add find_package(tinyxml2) to CMake builds (#2691)

So far, the cmake files of Cppcheck needed to be patched in order to
use installed tinyxml2 instead of the bundled version of tinyxml2.
- Introduce the CMake option USE_BUNDLED_TINYXML2 with a default value
  of ON. This preserves the behavior as in the past and uses the
  bundled version under externals/tinyxml2 by default.
- Usage of the installed tinyxml2 version of a system can be enabled
  now using -DUSE_BUNDLED_TINYXML2=OFF as a cmake parameter.
- Some Linux distros do not install tinyxml2*.cmake files, which are
  required to find tinyxml2 using find_package().
  Try first using find_package(tinyxml2 QUIET) and if this fails, try
  again using find_library(tinyxml2_LIBRARY tinyxml2)

CMakeLists.txt

@@ -33,7 +33,10 @@ if (BUILD_TESTS)
     enable_testing()
 endif()
 
+if(USE_BUNDLED_TINYXML2)
+    message(STATUS "Using bundled version of tinyxml2")
     add_subdirectory(externals/tinyxml2)
+endif()
 add_subdirectory(externals/simplecpp)
 add_subdirectory(lib)   # CppCheck Library 
 add_subdirectory(cli)   # Client application

cli/CMakeLists.txt

@@ -1,5 +1,7 @@
 include_directories(${PROJECT_SOURCE_DIR}/lib/)
+if(USE_BUNDLED_TINYXML2)
     include_directories(SYSTEM ${PROJECT_SOURCE_DIR}/externals/tinyxml2/)
+endif()
 include_directories(${PROJECT_SOURCE_DIR}/externals/simplecpp/)
 
 file(GLOB hdrs "*.h")
@@ -8,7 +10,13 @@ file(GLOB mainfile "main.cpp")
 list(REMOVE_ITEM srcs ${mainfile})
 
 add_library(cli_objs OBJECT ${hdrs} ${srcs})
-add_executable(cppcheck ${hdrs} ${mainfile} $<TARGET_OBJECTS:cli_objs> $<TARGET_OBJECTS:lib_objs> $<TARGET_OBJECTS:tinyxml2_objs> $<TARGET_OBJECTS:simplecpp_objs>)
+
+list(APPEND cppcheck_SOURCES ${hdrs} ${mainfile} $<TARGET_OBJECTS:cli_objs> $<TARGET_OBJECTS:lib_objs> $<TARGET_OBJECTS:simplecpp_objs>)
+if(USE_BUNDLED_TINYXML2)
+    list(APPEND cppcheck_SOURCES $<TARGET_OBJECTS:tinyxml2_objs>)
+endif()
+
+add_executable(cppcheck ${cppcheck_SOURCES})
 if (HAVE_RULES)
     target_link_libraries(cppcheck ${PCRE_LIBRARY})
 endif()
@@ -18,6 +26,9 @@ endif()
 if (WIN32 AND NOT BORLAND)
     target_link_libraries(cppcheck Shlwapi.lib)
 endif()
+if(tinyxml2_FOUND AND NOT USE_BUNDLED_TINYXML2)
+    target_link_libraries(cppcheck tinyxml2)
+endif()
 
 install(TARGETS cppcheck
     RUNTIME DESTINATION ${CMAKE_INSTALL_FULL_BINDIR}

cmake/findDependencies.cmake

@@ -38,3 +38,16 @@ if (NOT USE_MATCHCOMPILER_OPT MATCHES "Off")
         set(USE_MATCHCOMPILER_OPT "Off")
     endif()
 endif()
+
+if (NOT USE_BUNDLED_TINYXML2)
+    find_package(tinyxml2 QUIET)
+    if (NOT tinyxml2_FOUND)
+        find_library(tinyxml2_LIBRARY tinyxml2)
+        if (NOT tinyxml2_LIBRARY)
+            message(FATAL_ERROR "tinyxml2 has not been found")
+        else()
+            message(STATUS "tinyxml2_LIBRARY: ${tinyxml2_LIBRARY}")
+            set(tinyxml2_FOUND 1)
+        endif()
+    endif()
+endif()

cmake/options.cmake

@@ -41,6 +41,7 @@ option(WITH_QCHART          "When building GUI(need BUILD_GUI=ON), use Qt5 Chart
 
 option(HAVE_RULES           "Usage of rules (needs PCRE library and headers)"               OFF)
 option(USE_Z3               "Usage of z3 library"                                           OFF)
+option(USE_BUNDLED_TINYXML2 "Usage of bundled tinyxml2 library"                             ON)
 
 # precompiled headers do not emit compiler warnings so we cannot use them right now
 #if (CMAKE_VERSION VERSION_EQUAL "3.16" OR CMAKE_VERSION VERSION_GREATER "3.16")

cmake/printInfo.cmake

@@ -52,6 +52,7 @@ if (USE_Z3)
     message( STATUS "Z3_LIBRARIES =          ${Z3_LIBRARIES}" )
     message( STATUS "Z3_CXX_INCLUDE_DIRS =   ${Z3_CXX_INCLUDE_DIRS}" )
 endif()
+message( STATUS "USE_BUNDLED_TINYXML2 =  ${USE_BUNDLED_TINYXML2}" )
 message( STATUS )
 
 if(${ANALYZE_ADDRESS})

gui/CMakeLists.txt

@@ -10,7 +10,9 @@ if (BUILD_GUI)
     endif()
 
     include_directories(${PROJECT_SOURCE_DIR}/lib/)
+    if(USE_BUNDLED_TINYXML2)
         include_directories(SYSTEM ${PROJECT_SOURCE_DIR}/externals/tinyxml2/)
+    endif()
 
     file(GLOB hdrs "*.h")
     file(GLOB srcs "*.cpp")
@@ -19,14 +21,21 @@ if (BUILD_GUI)
     QT5_WRAP_UI(uis_hdrs ${uis})
     QT5_ADD_RESOURCES(resources "gui.qrc")
     QT5_ADD_TRANSLATION(qms ${tss})
+    list(APPEND cppcheck-gui_SOURCES ${hdrs} ${srcs} ${uis_hdrs} ${resources} ${qms} $<TARGET_OBJECTS:lib_objs> $<TARGET_OBJECTS:simplecpp_objs>)
+    if(USE_BUNDLED_TINYXML2)
+        list(APPEND cppcheck-gui_SOURCES $<TARGET_OBJECTS:tinyxml2_objs>)
+    endif()
 
-    add_executable(cppcheck-gui ${hdrs} ${srcs} ${uis_hdrs} ${resources} ${qms} $<TARGET_OBJECTS:lib_objs> $<TARGET_OBJECTS:tinyxml2_objs> $<TARGET_OBJECTS:simplecpp_objs>)
+    add_executable(cppcheck-gui ${cppcheck-gui_SOURCES})
     if (HAVE_RULES)
         target_link_libraries(cppcheck-gui ${PCRE_LIBRARY})
     endif()
     if (USE_Z3)
         target_link_libraries(cppcheck-gui ${Z3_LIBRARIES})
     endif()
+    if(tinyxml2_FOUND AND NOT USE_BUNDLED_TINYXML2)
+        target_link_libraries(cppcheck-gui tinyxml2)
+    endif()
     target_link_libraries(cppcheck-gui Qt5::Core Qt5::Gui Qt5::Widgets Qt5::PrintSupport Qt5::Help)
     if(WITH_QCHART)
         target_compile_definitions (cppcheck-gui PRIVATE HAVE_QCHART )

test/CMakeLists.txt

@@ -1,12 +1,18 @@
 if (BUILD_TESTS)
     include_directories(${PROJECT_SOURCE_DIR}/lib/ ${PROJECT_SOURCE_DIR}/cli/)
+    if(USE_BUNDLED_TINYXML2)
         include_directories(SYSTEM ${PROJECT_SOURCE_DIR}/externals/tinyxml2)
+    endif()
     include_directories(${PROJECT_SOURCE_DIR}/externals/simplecpp/)
 
     file(GLOB hdrs "*.h")
     file(GLOB srcs "*.cpp")
+    list(APPEND testrunner_SOURCES ${hdrs} ${srcs} $<TARGET_OBJECTS:lib_objs> $<TARGET_OBJECTS:cli_objs> $<TARGET_OBJECTS:simplecpp_objs>)
+    if(USE_BUNDLED_TINYXML2)
+        list(APPEND testrunner_SOURCES $<TARGET_OBJECTS:tinyxml2_objs>)
+    endif()
 
-    add_executable(testrunner ${hdrs} ${srcs} $<TARGET_OBJECTS:lib_objs> $<TARGET_OBJECTS:cli_objs> $<TARGET_OBJECTS:tinyxml2_objs> $<TARGET_OBJECTS:simplecpp_objs>)
+    add_executable(testrunner ${testrunner_SOURCES})
     if (HAVE_RULES)
         target_link_libraries(testrunner ${PCRE_LIBRARY})
     endif()
@@ -16,6 +22,9 @@ if (BUILD_TESTS)
     if (WIN32 AND NOT BORLAND)
         target_link_libraries(testrunner Shlwapi.lib)
     endif()
+    if(tinyxml2_FOUND AND NOT USE_BUNDLED_TINYXML2)
+        target_link_libraries(testrunner tinyxml2)
+    endif()
 
     if (NOT CMAKE_DISABLE_PRECOMPILE_HEADERS)
         target_precompile_headers(testrunner PRIVATE precompiled.h)