Install CMake export files

Rework of the closed pull request #768

googletest/CMakeLists.txt

@@ -85,10 +85,30 @@ include(cmake/internal_utils.cmake)
 
 config_compiler_and_linker()  # Defined in internal_utils.cmake.
 
+# Create the CMake package file descriptors.
+if (INSTALL_GTEST)
+  include(CMakePackageConfigHelpers)
+  set(cmake_package_name GTest)
+  set(targets_export_name ${cmake_package_name}Targets CACHE INTERNAL "")
+  set(generated_dir "${CMAKE_CURRENT_BINARY_DIR}/generated" CACHE INTERNAL "")
+  set(cmake_files_install_dir "${CMAKE_INSTALL_LIBDIR}/cmake/${cmake_package_name}")
+  set(version_file "${generated_dir}/${cmake_package_name}ConfigVersion.cmake")
+  write_basic_package_version_file(${version_file} COMPATIBILITY AnyNewerVersion)
+  install(EXPORT ${targets_export_name}
+    NAMESPACE ${cmake_package_name}::
+    DESTINATION ${cmake_files_install_dir})
+  set(config_file "${generated_dir}/${cmake_package_name}Config.cmake")
+  configure_package_config_file("${gtest_SOURCE_DIR}/cmake/Config.cmake.in"
+    "${config_file}" INSTALL_DESTINATION ${cmake_files_install_dir})
+  install(FILES ${version_file} ${config_file}
+    DESTINATION ${cmake_files_install_dir})
+endif()
+
 # Where Google Test's .h files can be found.
-include_directories(
+set(gtest_build_include_dirs
   "${gtest_SOURCE_DIR}/include"
   "${gtest_SOURCE_DIR}")
+include_directories(${gtest_build_include_dirs})
 
 # Summary of tuple support for Microsoft Visual Studio:
 # Compiler    version(MS)  version(cmake)  Support
@@ -112,62 +132,23 @@ endif()
 # aggressive about warnings.
 cxx_library(gtest "${cxx_strict}" src/gtest-all.cc)
 cxx_library(gtest_main "${cxx_strict}" src/gtest_main.cc)
-target_link_libraries(gtest_main gtest)
-
 # If the CMake version supports it, attach header directory information
 # to the targets for when we are part of a parent build (ie being pulled
 # in via add_subdirectory() rather than being a standalone build).
 if (DEFINED CMAKE_VERSION AND NOT "${CMAKE_VERSION}" VERSION_LESS "2.8.11")
-  target_include_directories(gtest SYSTEM
-    INTERFACE
-      $<BUILD_INTERFACE:${gtest_SOURCE_DIR}/include>
-      $<BUILD_INTERFACE:${gtest_SOURCE_DIR}>
-      $<INSTALL_INTERFACE:include>)
-  target_include_directories(gtest_main SYSTEM
-    INTERFACE
-      $<BUILD_INTERFACE:${gtest_SOURCE_DIR}/include>
-      $<BUILD_INTERFACE:${gtest_SOURCE_DIR}>
-      $<INSTALL_INTERFACE:include>)
+  target_include_directories(gtest SYSTEM INTERFACE
+    "$<BUILD_INTERFACE:${gtest_build_include_dirs}>"
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
+  target_include_directories(gtest_main SYSTEM INTERFACE
+    "$<BUILD_INTERFACE:${gtest_build_include_dirs}>"
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
 endif()
+target_link_libraries(gtest_main PUBLIC gtest)
 
 ########################################################################
 #
 # Install rules
-if(INSTALL_GTEST)
-  install(TARGETS gtest
-    EXPORT gtestConfigInternal
-    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
-    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
-    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
-  install(EXPORT gtestConfigInternal
-    DESTINATION "${INSTALL_CMAKE_DIR}"
-    NAMESPACE googletest_)
-  install(TARGETS gtest_main
-    EXPORT gtest_mainConfigInternal
-    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
-    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
-    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
-  install(EXPORT gtest_mainConfigInternal
-    DESTINATION "${INSTALL_CMAKE_DIR}"
-    NAMESPACE googletest_)
-  set(googletest_install_targets
-    ${googletest_install_targets} gtest gtest_main PARENT_SCOPE)
-
-  install(DIRECTORY "${gtest_SOURCE_DIR}/include/gtest"
-    DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
-
-  # configure and install pkgconfig files
-  configure_file(
-    cmake/gtest.pc.in
-    "${gtest_BINARY_DIR}/gtest.pc"
-    @ONLY)
-  configure_file(
-    cmake/gtest_main.pc.in
-    "${gtest_BINARY_DIR}/gtest_main.pc"
-    @ONLY)
-  install(FILES "${gtest_BINARY_DIR}/gtest.pc" "${gtest_BINARY_DIR}/gtest_main.pc"
-    DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
-endif()
+install_project(gtest gtest_main)
 
 ########################################################################
 #

googletest/cmake/Config.cmake.in

@@ -0,0 +1,9 @@
+@PACKAGE_INIT@
+include(CMakeFindDependencyMacro)
+if (@GTEST_HAS_PTHREAD@)
+  set(THREADS_PREFER_PTHREAD_FLAG @THREADS_PREFER_PTHREAD_FLAG@)
+  find_dependency(Threads)
+endif()
+
+include("${CMAKE_CURRENT_LIST_DIR}/@targets_export_name@.cmake")
+check_required_components("@project_name@")

googletest/cmake/internal_utils.cmake

@@ -171,9 +171,18 @@ function(cxx_library_with_type name type cxx_flags)
     set_target_properties(${name}
       PROPERTIES
       COMPILE_DEFINITIONS "GTEST_CREATE_SHARED_LIBRARY=1")
+    if (NOT "${CMAKE_VERSION}" VERSION_LESS "2.8.11")
+      target_compile_definitions(${name} INTERFACE
+        $<INSTALL_INTERFACE:GTEST_LINKED_AS_SHARED_LIBRARY=1>)
+    endif()
   endif()
   if (DEFINED GTEST_HAS_PTHREAD)
-    target_link_libraries(${name} ${CMAKE_THREAD_LIBS_INIT})
+    if ("${CMAKE_VERSION}" VERSION_LESS "3.1.0")
+      set(threads_spec ${CMAKE_THREAD_LIBS_INIT})
+    else()
+      set(threads_spec Threads::Threads)
+    endif()
+    target_link_libraries(${name} PUBLIC ${threads_spec})
   endif()
 endfunction()
 
@@ -283,3 +292,27 @@ function(py_test name)
     endif (${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 3.1)
   endif(PYTHONINTERP_FOUND)
 endfunction()
+
+# install_project(targets...)
+#
+# Installs the specified targets and configures the associated pkgconfig files.
+function(install_project)
+  if(INSTALL_GTEST)
+    install(DIRECTORY "${PROJECT_SOURCE_DIR}/include/"
+      DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
+    # Install the project targets.
+    install(TARGETS ${ARGN}
+      EXPORT ${targets_export_name}
+      RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+      ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+      LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
+    # Configure and install pkgconfig files.
+    foreach(t ${ARGN})
+      set(configured_pc "${generated_dir}/${t}.pc")
+      configure_file("${PROJECT_SOURCE_DIR}/cmake/${t}.pc.in"
+        "${configured_pc}" @ONLY)
+      install(FILES "${configured_pc}"
+        DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
+    endforeach()
+  endif()
+endfunction()