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Adding an External Source Directory to the CMake Assembly

I use Google Mock for my project, and the instructions say that it is better to build a library with the project, because various compiler flags may introduce errors. I do not want to add the gmock / directory to my repository; I would prefer the sources to be external dependent and connect it to my build process. This brings me to my question: how can I train CMake to pull the external source directory into the assembly (i.e. Build it in my project build directory)? Here I found > a similar question , but the answers require hard placement in the directory, and I would prefer it to be tuned. Any other way to do this?

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You can use ExternalProject_Addfor this, since it allows you to download, configure and build gmock from your project build tree, and then a link to the gmock libraries.

@arrowdodger's answer is probably the more common way to do this. Using your method, usually you do not have gmock sources in the assembly tree. It can be good or bad depending on what you want.

ExternalProject_Add, gmock ( svn) , gmock . , ( , ). , gmock, , .

CMakeLists.txt Visual Studio 2010 2012 - , . , gtest Visual Studio 2012 (. ), PATCH_COMMAND 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 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})

CMakeLists.txt (, MyTest), :

cd MyTest
mkdir build
cd build
cmake ..

main.cpp MyTest/src (MyTest/build/Test.sln Windows)

, gmock MyTest/build/ThirdParty/src/googlemock MyTest/build/ThirdParty/src/googlemock-build. MainTest.

ExternalProject_Add . " CMake 2.8

gist, CMakeLists.txt

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, Google Mock CMake.

add_subdirectory(${GOOGLE_MOCK_SOURCE_DIR})

CMakeLists.txt, GOOGLE_MOCK_SOURCE_DIR :

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()
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