我在我的项目中使用Google Mock，并且指示说与项目一起构建库会更好，因为不同的编译器标志可能会引入错误。我不想将gmock /目录添加到我的存储库;我宁愿将源作为外部依赖项并将其插入到我的构建过程中。这让我想到了一个问题：我如何指示CMake将外部源目录拉入构建（即在我的项目的构建目录中构建它）？我在这里找到了similar question，但答案需要严格的目录放置，我宁愿配置。还有其他办法吗？
答案 0 :(得分：7)
您可以使用ExternalProject_Add，因为它允许您从项目的构建树中下载，配置和构建gmock，然后链接到gmock库。
@ arrowdodger的answer可能是更常见的方式。使用他的方法，您通常不会在构建树中拥有gmock源代码。根据你的需要，这可能是好事还是坏事。
使用ExternalProject_Add，每次构建gmock或依赖目标时都会拉取gmock源（svn update）。这使得构建稍微慢一些，但显然使源保持最新并且很方便（开发人员安装的依赖性较小）。对于像gmock这样经常不会改变的项目，虽然一直在更新的开销可能对你来说太过分了。
以下CMakeLists.txt使用Visual Studio 2010＆amp; 2012年 - 可能需要针对其他平台进行调整。特别是，gtest目前无法使用Visual Studio 2012构建框（请参阅此bug report），因此补丁文件和PATCH_COMMAND调用中的ExternalProject_Add。
cmake_minimum_required(VERSION 2.8.8 FATAL_ERROR)
project(Test)
# Create main.cpp which uses gmock
file(WRITE src/main.cpp "#include \"gmock/gmock.h\"\n\n")
file(APPEND src/main.cpp "struct A {\n virtual void Do() {}\n};\n\n")
file(APPEND src/main.cpp "struct MockA : public A {\n MOCK_METHOD0(Do, void());\n};\n\n")
file(APPEND src/main.cpp "TEST(A, Do) {\n")
file(APPEND src/main.cpp " MockA mock_a;\n")
file(APPEND src/main.cpp " EXPECT_CALL(mock_a, Do()).Times(testing::AtLeast(1));\n")
file(APPEND src/main.cpp " mock_a.Do();\n}\n\n")
file(APPEND src/main.cpp "int main(int argc, char **argv) {\n")
file(APPEND src/main.cpp " testing::InitGoogleTest(&argc, argv);\n")
file(APPEND src/main.cpp " return RUN_ALL_TESTS();\n")
file(APPEND src/main.cpp "}\n")
# Create patch file for gtest with MSVC 2012
if(MSVC_VERSION EQUAL 1700)
file(WRITE gtest.patch "Index: cmake/internal_utils.cmake\n")
file(APPEND gtest.patch "===================================================================\n")
file(APPEND gtest.patch "--- cmake/internal_utils.cmake (revision 643)\n")
file(APPEND gtest.patch "+++ cmake/internal_utils.cmake (working copy)\n")
file(APPEND gtest.patch "@@ -66,6 +66,9 @@\n")
file(APPEND gtest.patch " # Resolved overload was found by argument-dependent lookup.\n")
file(APPEND gtest.patch " set(cxx_base_flags \"\${cxx_base_flags} -wd4675\")\n")
file(APPEND gtest.patch " endif()\n")
file(APPEND gtest.patch "+ if (MSVC_VERSION EQUAL 1700)\n")
file(APPEND gtest.patch "+ set(cxx_base_flags \"\${cxx_base_flags} -D_VARIADIC_MAX=10\")\n")
file(APPEND gtest.patch "+ endif ()\n")
file(APPEND gtest.patch " set(cxx_base_flags \"\${cxx_base_flags} -D_UNICODE -DUNICODE -DWIN32 -D_WIN32\")\n")
file(APPEND gtest.patch " set(cxx_base_flags \"\${cxx_base_flags} -DSTRICT -DWIN32_LEAN_AND_MEAN\")\n")
file(APPEND gtest.patch " set(cxx_exception_flags \"-EHsc -D_HAS_EXCEPTIONS=1\")\n")
file(APPEND gtest.patch "Index: include/gtest/internal/gtest-tuple.h\n")
file(APPEND gtest.patch "===================================================================\n")
file(APPEND gtest.patch "--- include/gtest/internal/gtest-tuple.h (revision 643)\n")
file(APPEND gtest.patch "+++ include/gtest/internal/gtest-tuple.h (working copy)\n")
file(APPEND gtest.patch "@@ -1,3 +1,4 @@\n")
file(APPEND gtest.patch "+#include <tuple> /*\n")
file(APPEND gtest.patch " // This file was GENERATED by command:\n")
file(APPEND gtest.patch " // pump.py gtest-tuple.h.pump\n")
file(APPEND gtest.patch " // DO NOT EDIT BY HAND!!!\n")
file(APPEND gtest.patch "@@ -197,8 +198,8 @@\n")
file(APPEND gtest.patch " class tuple<> {\n")
file(APPEND gtest.patch " public:\n")
file(APPEND gtest.patch " tuple() {}\n")
file(APPEND gtest.patch "- tuple(const tuple& /* t */) {}\n")
file(APPEND gtest.patch "- tuple& operator=(const tuple& /* t */) { return *this; }\n")
file(APPEND gtest.patch "+ tuple(const tuple& t) {}\n")
file(APPEND gtest.patch "+ tuple& operator=(const tuple&) { return *this; }\n")
file(APPEND gtest.patch " };\n")
file(APPEND gtest.patch " \n")
file(APPEND gtest.patch " template <GTEST_1_TYPENAMES_(T)>\n")
file(APPEND gtest.patch "@@ -946,7 +947,7 @@\n")
file(APPEND gtest.patch " template <>\n")
file(APPEND gtest.patch " struct SameSizeTuplePrefixComparator<0, 0> {\n")
file(APPEND gtest.patch " template <class Tuple1, class Tuple2>\n")
file(APPEND gtest.patch "- static bool Eq(const Tuple1& /* t1 */, const Tuple2& /* t2 */) {\n")
file(APPEND gtest.patch "+ static bool Eq(const Tuple1&, const Tuple2&) {\n")
file(APPEND gtest.patch " return true;\n")
file(APPEND gtest.patch " }\n")
file(APPEND gtest.patch " };\n")
else()
file(WRITE gtest.patch "")
endif()
# Enable ExternalProject CMake module
include(ExternalProject)
# Set default ExternalProject root directory
set_directory_properties(PROPERTIES EP_PREFIX ${CMAKE_BINARY_DIR}/ThirdParty)
# Add gmock
ExternalProject_Add(
googlemock
SVN_REPOSITORY http://googlemock.googlecode.com/svn/trunk/
TIMEOUT 30
PATCH_COMMAND svn patch ${CMAKE_SOURCE_DIR}/gtest.patch ${CMAKE_BINARY_DIR}/ThirdParty/src/googlemock/gtest
# Force separate output paths for debug and release builds to allow easy
# identification of correct lib in subsequent TARGET_LINK_LIBRARIES commands
CMAKE_ARGS -DCMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG:PATH=DebugLibs
-DCMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE:PATH=ReleaseLibs
-Dgtest_force_shared_crt=ON
# Disable install step
INSTALL_COMMAND ""
# Wrap download, configure and build steps in a script to log output
LOG_DOWNLOAD ON
LOG_CONFIGURE ON
LOG_BUILD ON)
# Specify include dir for googlemock and googletest
ExternalProject_Get_Property(googlemock source_dir)
include_directories(${source_dir}/include)
include_directories(${source_dir}/gtest/include)
if(MSVC_VERSION EQUAL 1700)
add_definitions(-D_VARIADIC_MAX=10)
endif()
# Add test executable target
add_executable(MainTest ${PROJECT_SOURCE_DIR}/src/main.cpp)
# Create dependency of MainTest on googlemock
add_dependencies(MainTest googlemock)
# Specify MainTest's link libraries
ExternalProject_Get_Property(googlemock binary_dir)
target_link_libraries(MainTest
debug ${binary_dir}/DebugLibs/${CMAKE_FIND_LIBRARY_PREFIXES}gmock${CMAKE_FIND_LIBRARY_SUFFIXES}
optimized ${binary_dir}/ReleaseLibs/${CMAKE_FIND_LIBRARY_PREFIXES}gmock${CMAKE_FIND_LIBRARY_SUFFIXES})
如果在空目录（比如MyTest）中将其创建为CMakeLists.txt，则：
cd MyTest
mkdir build
cd build
cmake ..
这应该在MyTest / src中创建一个基本的main.cpp并创建一个项目文件（Windows上的MyTest / build / Test.sln）
当你构建项目时，它应该将gmock源代码下载到MyTest / build / ThirdParty / src / googlemock，并在MyTest / build / ThirdParty / src / googlemock-build中构建它们。然后，您应该能够成功运行MainTest目标。
有关ExternalProject_Add命令的详细信息，请参阅this article entitled Building External Projects with CMake 2.8
此处a gist包含此CMakeLists.txt
答案 1 :(得分：6)
我看到Google Mock支持CMake。在这种情况下，您只需添加此行
即可add_subdirectory(${GOOGLE_MOCK_SOURCE_DIR})
进入根CMakeLists.txt并让用户在配置步骤中设置GOOGLE_MOCK_SOURCE_DIR变量：
set(GOOGLE_MOCK_SOURCE_DIR "" CACHE PATH "Path to the GMock source")
if(NOT ${GOOGLE_MOCK_SOURCE_DIR} OR NOT EXISTS "${GOOGLE_MOCK_SOURCE_DIR}/CMakeLists.txt")
message(FATAL_ERROR "GOOGLE_MOCK_SOURCE_DIR isn't set properly!")
endif()