Manage depot_tools, replace modules, remove Targets folder, fixes #33

CMakeLists.txt

@@ -23,5 +23,82 @@ if (NOT WIN32)
   find_package(PythonInterp 2.7 REQUIRED)
 endif (NOT WIN32)
 
-add_subdirectory(Targets)
+include(ExternalProject)
+
+if (NOT HAS_OWN_DEPOT_TOOLS)
+  if (WIN32)
+    set(GCLIENT_EXECUTABLE ${CMAKE_BINARY_DIR}/depot_tools/src/depot-tools/gclient.bat)
+  else (WIN32)
+    set(GCLIENT_EXECUTABLE ${CMAKE_BINARY_DIR}/depot_tools/src/depot-tools/gclient)
+  endif (WIN32)
+
+  ExternalProject_Add(
+      depot-tools
+
+      GIT_REPOSITORY https://chromium.googlesource.com/chromium/tools/depot_tools
+
+      PREFIX ${CMAKE_BINARY_DIR}/depot_tools
+
+      CONFIGURE_COMMAND ""
+      UPDATE_COMMAND ""
+      PATCH_COMMAND ""
+      BUILD_COMMAND ""
+      INSTALL_COMMAND ""
+  )
+
+  set(_NEXT_DEPENDS depot-tools)
+  set(DEPOT_TOOLS_PATH ${CMAKE_BINARY_DIR}/depot_tools/src/depot-tools)
+endif (NOT HAS_OWN_DEPOT_TOOLS)
+
+ExternalProject_Add(
+    webrtc-src
+
+    DEPENDS ${_NEXT_DEPENDS}
+    GIT_REPOSITORY https://chromium.googlesource.com/external/webrtc
+
+    PREFIX ${CMAKE_BINARY_DIR}/webrtc
+    BINARY_DIR ${CMAKE_BINARY_DIR}/webrtc/build
+    DOWNLOAD_DIR ${CMAKE_BINARY_DIR}/webrtc/src
+    SOURCE_DIR ${CMAKE_BINARY_DIR}/webrtc/src
+    STAMP_DIR ${CMAKE_BINARY_DIR}/webrtc/stamp
+    TMP_DIR ${CMAKE_BINARY_DIR}/webrtc/tmp
+
+    PATCH_COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_SOURCE_DIR}/webrtc/CMakeLists.txt.in ${CMAKE_BINARY_DIR}/webrtc/src/CMakeLists.txt
+    UPDATE_COMMAND ""
+    INSTALL_COMMAND ""
+
+    CMAKE_ARGS
+    -DDEPOT_TOOLS_PATH:PATH=${DEPOT_TOOLS_PATH}
+    -DGCLIENT_EXECUTABLE:PATH=${GCLIENT_EXECUTABLE}
+    -DHAS_OWN_DEPOT_TOOLS:PATH=${HAS_OWN_DEPOT_TOOLS}
+    -DCMAKE_MODULE_PATH:PATH=${CMAKE_MODULE_PATH}
+    -DTARGET_CPU=${TARGET_CPU}
+    -DTARGET_OS=${TARGET_OS}
+    -DWEBRTC_BRANCH_HEAD=${WEBRTC_BRANCH_HEAD}
+    -DWEBRTC_PARENT_DIR:PATH=${CMAKE_BINARY_DIR}/webrtc
+    -DWEBRTC_REVISION=${WEBRTC_REVISION}
+    -DWEBRTC_ROOT_DIR:PATH=${CMAKE_BINARY_DIR}
+)
+
+ExternalProject_Add(
+    libwebrtc
+    DEPENDS webrtc-src
+
+    INSTALL_DIR ${CMAKE_BINARY_DIR}
+    SOURCE_DIR ${CMAKE_SOURCE_DIR}/libwebrtc
+    BINARY_DIR ${CMAKE_BINARY_DIR}/libwebrtc
+
+    CMAKE_ARGS
+    -DLIBRARY_TYPE:STRING=${LIBRARY_TYPE}
+    -DTARGET_OS:STRING=${TARGET_OS}
+    -DWEBRTC_OUTPUT_DIR:PATH=${CMAKE_BINARY_DIR}/webrtc/src/out/Default
+    -DWEBRTC_SOURCE_DIR:PATH=${CMAKE_BINARY_DIR}/webrtc/src/webrtc
+    -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_BINARY_DIR}
+    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+    -DINSTALL_CMAKE_DIR:PATH=${CMAKE_BINARY_DIR}/lib/cmake/LibWebRTC
+)
+
+include(Install)
+include(Package)
+
 export(PACKAGE LibWebRTC)

CMakeModules/DepotTools.cmake

@@ -0,0 +1,75 @@
+if (HAS_OWN_DEPOT_TOOLS)
+  return()
+endif (HAS_OWN_DEPOT_TOOLS)
+
+if (WEBRTC_REVISION)
+  message(STATUS "Retrieving date for commit ${WEBRTC_REVISION}")
+  execute_process(COMMAND ${GIT_EXECUTABLE} log -1 --format=%ci ${WEBRTC_REVISION}
+                  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+                  OUTPUT_VARIABLE _WEBRTC_COMMIT_DATE)
+
+  if (NOT _WEBRTC_COMMIT_DATE)
+    message(FATAL_ERROR "-- Unable to find webrtc commit date at ${WEBRTC_REVISION}")
+  endif (NOT _WEBRTC_COMMIT_DATE)
+elseif (WEBRTC_BRANCH_HEAD)
+  message(STATUS "Retrieving branch-heads refspecs")
+  execute_process(COMMAND ${GIT_EXECUTABLE} config remote.origin.fetch +refs/branch-heads/*:refs/remotes/branch-heads/* ^\\+refs/branch-heads/\\*:.*$
+                  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+                  RESULT_VARIABLE _ADD_REMOTE_RESULT)
+
+  if (NOT _ADD_REMOTE_RESULT EQUAL 0)
+    message(FATAL_ERROR "-- Unable to add branch-heads refspec")
+  endif (NOT _ADD_REMOTE_RESULT EQUAL 0)
+
+  message(STATUS "Fetching ${WEBRTC_BRANCH_HEAD}")
+  execute_process(COMMAND ${GIT_EXECUTABLE} fetch origin ${WEBRTC_BRANCH_HEAD}
+                  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+                  RESULT_VARIABLE _WEBRTC_FETCH_RESULT)
+
+  if (NOT _WEBRTC_FETCH_RESULT EQUAL 0)
+    message(FATAL_ERROR "-- Unable to fetch ${WEBRTC_BRANCH_HEAD}")
+  endif (NOT _WEBRTC_FETCH_RESULT EQUAL 0)
+
+  message(STATUS "Checking out ${WEBRTC_BRANCH_HEAD}")
+  execute_process(COMMAND ${GIT_EXECUTABLE} checkout FETCH_HEAD
+                  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+                  RESULT_VARIABLE _WEBRTC_CHECKOUT_RESULT)
+
+  if (NOT _WEBRTC_CHECKOUT_RESULT EQUAL 0)
+    message(FATAL_ERROR "-- Unable to checkout ${WEBRTC_BRANCH_HEAD}")
+  endif (NOT _WEBRTC_CHECKOUT_RESULT EQUAL 0)
+
+  message(STATUS "Retrieving date for commit ${WEBRTC_BRANCH_HEAD}")
+  execute_process(COMMAND ${GIT_EXECUTABLE} log -1 --format=%ci
+                  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+                  OUTPUT_VARIABLE _WEBRTC_COMMIT_DATE
+                  RESULT_VARIABLE _WEBRTC_COMMIT_DATE_RESULT)
+
+  if (NOT _WEBRTC_COMMIT_DATE_RESULT EQUAL 0)
+    message(FATAL_ERROR "-- Unable to retrieve the commit date")
+  endif (NOT _WEBRTC_COMMIT_DATE_RESULT EQUAL 0)
+else (WEBRTC_REVISION)
+  message(FATAL_ERROR "-- Both WEBRTC_REVISION and WEBRTC_BRANCH_HEAD variables are undefined")
+endif (WEBRTC_REVISION)
+
+string(STRIP ${_WEBRTC_COMMIT_DATE} _WEBRTC_COMMIT_DATE)
+message(STATUS "Retrieving depot_tools commit before ${_WEBRTC_COMMIT_DATE}")
+
+execute_process(COMMAND ${GIT_EXECUTABLE} rev-list -n 1 --before=\"${_WEBRTC_COMMIT_DATE}\" master
+                WORKING_DIRECTORY ${DEPOT_TOOLS_PATH}
+                OUTPUT_VARIABLE _DEPOT_TOOLS_COMMIT)
+
+if (NOT _DEPOT_TOOLS_COMMIT)
+  message(FATAL_ERROR "-- Unable to find depot_tools commit before ${_WEBRTC_COMMIT_DATE}")
+endif (NOT _DEPOT_TOOLS_COMMIT)
+
+string(STRIP ${_DEPOT_TOOLS_COMMIT} _DEPOT_TOOLS_COMMIT)
+message(STATUS "Checking out depot_tools to commit ${_DEPOT_TOOLS_COMMIT}")
+
+execute_process(COMMAND ${GIT_EXECUTABLE} checkout ${_DEPOT_TOOLS_COMMIT}
+                WORKING_DIRECTORY ${DEPOT_TOOLS_PATH}
+                RESULT_VARIABLE _DEPOT_TOOLS_CHECKED_OUT)
+
+if (NOT _DEPOT_TOOLS_CHECKED_OUT EQUAL 0)
+  message(FATAL_ERROR "-- Unable to checkout depot_tools to commit ${_DEPOT_TOOLS_COMMIT}")
+endif (NOT _DEPOT_TOOLS_CHECKED_OUT EQUAL 0)

CMakeModules/Environment.cmake

@@ -1,35 +1,24 @@
-if(PREFIX_INCLUDED)
+set(_WEBRTC_PATH ${DEPOT_TOOLS_PATH})
-  return()
+set(_DEPOT_TOOLS_ENV PATH=${_WEBRTC_PATH})
-endif(PREFIX_INCLUDED)
-set(PREFIX_INCLUDED true)
-
-#
-# Generate environment variables
-#
-if (DEPOT_TOOLS_PATH)
-  set(WEBRTC_PATH ${DEPOT_TOOLS_PATH})
-else (DEPOT_TOOLS_PATH)
-  set(WEBRTC_PATH ${CMAKE_BINARY_DIR}/depot_tools)
-endif (DEPOT_TOOLS_PATH)
 
 if (WIN32)
   get_filename_component(DEPOT_TOOLS_PYTHON_PATH
-                         "${WEBRTC_PATH}/python276_bin"
+                         "${_WEBRTC_PATH}/python276_bin"
                          REALPATH)
-  list(APPEND WEBRTC_PATH ${DEPOT_TOOLS_PYTHON_PATH})
+  list(APPEND _WEBRTC_PATH ${DEPOT_TOOLS_PYTHON_PATH})
 endif (WIN32)
 
-list(APPEND WEBRTC_PATH $ENV{PATH})
+list(APPEND _WEBRTC_PATH $ENV{PATH})
 
 if (WIN32)
-  string(REGEX REPLACE "/" "\\\\" WEBRTC_PATH "${WEBRTC_PATH}")
+  string(REGEX REPLACE "/" "\\\\" _WEBRTC_PATH "${_WEBRTC_PATH}")
-  string(REGEX REPLACE ";" "\\\;" WEBRTC_PATH "${WEBRTC_PATH}")
+  string(REGEX REPLACE ";" "\\\;" _WEBRTC_PATH "${_WEBRTC_PATH}")
 else (WIN32)
-  string(REGEX REPLACE ";" ":" WEBRTC_PATH "${WEBRTC_PATH}")
+  string(REGEX REPLACE ";" ":" _WEBRTC_PATH "${_WEBRTC_PATH}")
 endif (WIN32)
 
-get_filename_component(CHROMIUM_PYTHONPATH
+get_filename_component(_CHROMIUM_PYTHONPATH
-                       "${CMAKE_BINARY_DIR}/src/build"
+                       "${CMAKE_SOURCE_DIR}/build"
                        REALPATH)
 
 if (WIN32)
@@ -49,10 +38,11 @@ else (WIN32)
 endif (WIN32)
 
 file(WRITE ${PREFIX_FILENAME} "${PREFIX_HEADER}
-${PREFIX_COMMAND} PATH=${WEBRTC_PATH}
+${PREFIX_COMMAND} PATH=${_WEBRTC_PATH}
-${PREFIX_COMMAND} PYTHONPATH=${CHROMIUM_PYTHONPATH}
+${PREFIX_COMMAND} PYTHONPATH=${_CHROMIUM_PYTHONPATH}
 ${PREFIX_COMMAND} DEPOT_TOOLS_WIN_TOOLCHAIN=0
 ${PREFIX_COMMAND} DEPOT_TOOLS_UPDATE=0
 ${PREFIX_COMMAND} CHROME_HEADLESS=1
 ${PREFIX_EVAL}
 ")
+

CMakeModules/GClient.cmake

@@ -0,0 +1,22 @@
+file(WRITE ${WEBRTC_PARENT_DIR}/.gclient "solutions = [
+  {
+    \"url\": \"https://chromium.googlesource.com/external/webrtc.git\",
+    \"managed\": False,
+    \"name\": \"src\",
+    \"deps_file\": \"DEPS\",
+    \"custom_deps\": {},
+  },
+]
+")
+
+if (TARGET_OS STREQUAL "android")
+  file(APPEND ${WEBRTC_PARENT_DIR}/.gclient "target_os = [\"android\", \"unix\"]")
+elseif (TARGET_OS STREQUAL "ios")
+  file(APPEND ${WEBRTC_PARENT_DIR}/.gclient "target_os = [\"ios\", \"mac\"]")
+elseif (TARGET_OS STREQUAL "linux")
+  file(APPEND ${WEBRTC_PARENT_DIR}/.gclient "target_os = [\"unix\"]")
+elseif (TARGET_OS STREQUAL "mac")
+  file(APPEND ${WEBRTC_PARENT_DIR}/.gclient "target_os = [\"mac\"]")
+elseif (TARGET_OS STREQUAL "win")
+  file(APPEND ${WEBRTC_PARENT_DIR}/.gclient "target_os = [\"win\"]")
+endif (TARGET_OS STREQUAL "android")

CMakeModules/GClientConfig.cmake

@@ -1,30 +0,0 @@
-if(GCLIENT_CONFIG_INCLUDED)
-  return()
-endif(GCLIENT_CONFIG_INCLUDED)
-set(GCLIENT_CONFIG_INCLUDED true)
-
-#
-# Retrieve WebRTC source code
-#
-file(WRITE ${CMAKE_BINARY_DIR}/.gclient "solutions = [
-  {
-    \"url\": \"https://chromium.googlesource.com/external/webrtc.git\",
-    \"managed\": False,
-    \"name\": \"src\",
-    \"deps_file\": \"DEPS\",
-    \"custom_deps\": {},
-  },
-]
-")
-
-if (TARGET_OS STREQUAL "android")
-  file(APPEND ${CMAKE_BINARY_DIR}/.gclient "target_os = [\"android\", \"unix\"]")
-elseif (TARGET_OS STREQUAL "ios")
-  file(APPEND ${CMAKE_BINARY_DIR}/.gclient "target_os = [\"ios\", \"mac\"]")
-elseif (TARGET_OS STREQUAL "linux")
-  file(APPEND ${CMAKE_BINARY_DIR}/.gclient "target_os = [\"unix\"]")
-elseif (TARGET_OS STREQUAL "mac")
-  file(APPEND ${CMAKE_BINARY_DIR}/.gclient "target_os = [\"mac\"]")
-elseif (TARGET_OS STREQUAL "win")
-  file(APPEND ${CMAKE_BINARY_DIR}/.gclient "target_os = [\"win\"]")
-endif (TARGET_OS STREQUAL "android")

CMakeModules/Gn.cmake

@@ -0,0 +1,35 @@
+set(_GEN_ARGS "use_gold=false target_cpu=\\\"${TARGET_CPU}\\\" target_os=\\\"${TARGET_OS}\\\"")
+
+if (MSVC OR XCODE)
+  set(_GEN_ARGS "${_GEN_ARGS} is_debug=false")
+elseif (CMAKE_BUILD_TYPE MATCHES Debug)
+  set(_GEN_ARGS "${_GEN_ARGS} is_debug=true")
+else (MSVC OR XCODE)
+  set(_GEN_ARGS "${_GEN_ARGS} is_debug=false")
+endif (MSVC OR XCODE)
+
+if (BUILD_TESTS)
+  set(_GEN_ARGS "${_GEN_ARGS} rtc_include_tests=true")
+else (BUILD_TESTS)
+  set(_GEN_ARGS "${_GEN_ARGS} rtc_include_tests=false")
+endif (BUILD_TESTS)
+
+if (GN_EXTRA_ARGS)
+  set(_GEN_ARGS "${_GEN_ARGS} ${GN_EXTRA_ARGS}")
+endif (GN_EXTRA_ARGS)
+
+set(_GN_OUT_DIR out/Default)
+set(_GEN_COMMAND_LINE gn gen ${_GN_OUT_DIR} --args=\"${_GEN_ARGS}\")
+
+if (WIN32)
+  set(_SCRIPT_SUFFIX .bat)
+elseif (UNIX)
+  set(_SCRIPT_SUFFIX .sh)
+  set(_GEN_COMMAND sh)
+endif (WIN32)
+
+string(REPLACE ";" " " _GEN_COMMAND_STR "${_GEN_COMMAND_LINE}")
+set(_GN_SCRIPT_FILENAME ${WEBRTC_PARENT_DIR}/gn-gen${_SCRIPT_SUFFIX})
+file(WRITE ${_GN_SCRIPT_FILENAME} ${_GEN_COMMAND_STR})
+
+set(_GEN_COMMAND ${_GEN_COMMAND} ${_GN_SCRIPT_FILENAME})

CMakeModules/LibWebRTCCommand.cmake

@@ -1,28 +0,0 @@
-if(LIBWEBRTC_COMMAND_INCLUDED)
-  return()
-endif(LIBWEBRTC_COMMAND_INCLUDED)
-set(LIBWEBRTC_COMMAND_INCLUDED true)
-
-include(CMakeParseArguments)
-include(Prefix)
-
-function(libwebrtc_command)
-  set(ONE_VALUE_ARGS NAME COMMENT DEPENDS WORKING_DIRECTORY)
-  set(MULTI_VALUE_ARGS COMMAND)
-  cmake_parse_arguments(COMMAND "" "${ONE_VALUE_ARGS}" "${MULTI_VALUE_ARGS}" ${ARGN} )
-
-  set(CMF_DIR ${CMAKE_BINARY_DIR}/CMakeFiles)
-  set(STAMP_FILE "${CMF_DIR}/${COMMAND_NAME}-complete")
-
-  add_custom_command(
-      OUTPUT ${STAMP_FILE}
-      COMMENT ${COMMAND_COMMENT}
-      COMMAND ${PREFIX_EXECUTE} ${COMMAND_COMMAND}
-      COMMAND ${CMAKE_COMMAND} -E touch ${STAMP_FILE}
-      WORKING_DIRECTORY ${COMMAND_WORKING_DIRECTORY}
-  )
-
-  add_custom_target(${COMMAND_NAME} ALL DEPENDS ${STAMP_FILE})
-
-  add_dependencies(${COMMAND_NAME} ${COMMAND_DEPENDS})
-endfunction()

Targets/CMakeLists.txt

@@ -1,205 +0,0 @@
-include(ExternalProject)
-include(LibWebRTCCommand)
-include(GClientConfig)
-
-set(_DOWNLOAD_COMMAND ${GCLIENT_EXECUTABLE} sync --with_branch_heads --nohooks)
-if (WEBRTC_REVISION)
-  set(_DOWNLOAD_COMMAND ${_DOWNLOAD_COMMAND} --revision ${WEBRTC_REVISION})
-endif (WEBRTC_REVISION)
-
-ExternalProject_Add(
-    webrtc-src
-    PREFIX ${CMAKE_BINARY_DIR}
-    BINARY_DIR ${CMAKE_BINARY_DIR}
-    SOURCE_DIR ${CMAKE_BINARY_DIR}
-    DOWNLOAD_DIR ${CMAKE_BINARY_DIR}
-
-    DOWNLOAD_COMMAND ${PREFIX_EXECUTE} ${_DOWNLOAD_COMMAND}
-    BUILD_COMMAND ""
-    INSTALL_COMMAND ""
-)
-
-set(_NEXT_DEPENDS webrtc-src)
-if (NOT WEBRTC_REVISION)
-  libwebrtc_command(
-      NAME webrtc-fetch-refs
-      COMMAND ${GIT_EXECUTABLE} fetch origin ${WEBRTC_BRANCH_HEAD}
-      WORKING_DIRECTORY "${CMAKE_BINARY_DIR}/src"
-      COMMENT "Fetching branch heads"
-      DEPENDS webrtc-src
-  )
-
-  libwebrtc_command(
-      NAME webrtc-checkout-fetch-head
-      COMMAND ${GIT_EXECUTABLE} checkout FETCH_HEAD
-      WORKING_DIRECTORY "${CMAKE_BINARY_DIR}/src"
-      COMMENT "Checking out fetch head"
-      DEPENDS webrtc-fetch-refs
-  )
-
-  set(_NEXT_DEPENDS webrtc-checkout-fetch-head)
-endif (NOT WEBRTC_REVISION)
-
-libwebrtc_command(
-    NAME webrtc-update-clang
-    COMMAND ${PYTHON_EXECUTABLE} src/tools/clang/scripts/update.py
-    WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-    COMMENT "Updating clang"
-    DEPENDS ${_NEXT_DEPENDS}
-)
-
-set(_NEXT_DEPENDS webrtc-update-clang)
-if (UNIX AND NOT APPLE)
-  libwebrtc_command(
-      NAME webrtc-install-sysroot
-      COMMAND ${CMAKE_BINARY_DIR}/src/build/linux/sysroot_scripts/install-sysroot.py --running-as-hook
-      WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-      COMMENT "Installing Linux sysroots"
-      DEPENDS ${_NEXT_DEPENDS}
-  )
-  set(_NEXT_DEPENDS webrtc-install-sysroot)
-
-  set(_PLATFORM linux*)
-  set(_FOLDER linux64)
-elseif (APPLE)
-  set(_PLATFORM darwin)
-  set(_FOLDER mac)
-elseif (WIN32)
-  libwebrtc_command(
-      NAME webrtc-vs-toolchain
-      COMMAND ${PYTHON_EXECUTABLE} src/build/vs_toolchain.py update
-      WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-      COMMENT "Updating Visual Studio toolchain"
-      DEPENDS ${_NEXT_DEPENDS}
-  )
-  set(_NEXT_DEPENDS webrtc-vs-toolchain)
-
-  set(_PLATFORM win32)
-  set(_FOLDER win)
-  set(_SUFFIX .exe)
-endif (UNIX AND NOT APPLE)
-
-libwebrtc_command(
-    NAME webrtc-fetch-gn
-    COMMAND download_from_google_storage --no_resume --platform=${_PLATFORM} --no_auth --bucket chromium-gn -s src/buildtools/${_FOLDER}/gn${_SUFFIX}.sha1
-    WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-    COMMENT "Fetching gn binary"
-    DEPENDS ${_NEXT_DEPENDS}
-)
-
-libwebrtc_command(
-    NAME webrtc-fetch-clang-format
-    COMMAND download_from_google_storage --no_resume --platform=${_PLATFORM} --no_auth --bucket chromium-clang-format -s src/buildtools/${_FOLDER}/clang-format${_SUFFIX}.sha1
-    WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-    COMMENT "Fetching clang-format binary"
-    DEPENDS webrtc-fetch-gn
-)
-
-#
-# Android dependencies
-set(_NEXT_DEPENDS webrtc-fetch-clang-format)
-if (TARGET_OS STREQUAL "android")
-  libwebrtc_command(
-      NAME webrtc-android-fetch-play-services
-      COMMAND ${PYTHON_EXECUTABLE} src/build/android/play_services/update.py download
-      WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-      COMMENT "Fetching Google Play Services"
-      DEPENDS webrtc-fetch-clang-format
-  )
-
-  libwebrtc_command(
-      NAME webrtc-android-update-lastchange
-      COMMAND ${PYTHON_EXECUTABLE} src/build/util/lastchange.py -o src/build/util/LASTCHANGE
-      WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-      COMMENT "Updating src/build/util/LASTCHANGE"
-      DEPENDS webrtc-android-fetch-play-services
-  )
-
-  set(_NEXT_DEPENDS webrtc-android-update-lastchange)
-  foreach(_DEPENDENCY_NAME android-support-test-runner espresso guava hamcrest javax-inject)
-    string(REPLACE "-" "_" _DEPENDENCY_FOLDER ${_DEPENDENCY_NAME})
-
-    libwebrtc_command(
-        NAME webrtc-android-fetch-${_DEPENDENCY_NAME}
-        COMMAND ${PYTHON_EXECUTABLE} src/build/android/update_deps/update_third_party_deps.py download -b chromium-${_DEPENDENCY_NAME} -l third_party/${_DEPENDENCY_FOLDER}
-        WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-        COMMENT "Fetching Android dependency: ${_DEPENDENCY_NAME}"
-        DEPENDS ${_NEXT_DEPENDS}
-    )
-
-    set(_NEXT_DEPENDS webrtc-android-fetch-${_DEPENDENCY_NAME})
-  endforeach(_DEPENDENCY_NAME)
-endif (TARGET_OS STREQUAL "android")
-
-#
-# Generate build files
-set(_GEN_ARGS use_gold=false target_cpu=\\"${TARGET_CPU}\\" target_os=\\"${TARGET_OS}\\")
-
-if (MSVC OR XCODE)
-  set(_GEN_ARGS ${_GEN_ARGS} is_debug=$<$<CONFIG:Debug>:true>$<$<CONFIG:Release>:false>)
-elseif (CMAKE_BUILD_TYPE MATCHES Debug)
-  set(_GEN_ARGS ${_GEN_ARGS} is_debug=true)
-else (MSVC OR XCODE)
-  set(_GEN_ARGS ${_GEN_ARGS} is_debug=false)
-endif (MSVC OR XCODE)
-
-if (BUILD_TESTS)
-  set(_GEN_ARGS ${_GEN_ARGS} rtc_include_tests=true)
-else (BUILD_TESTS)
-  set(_GEN_ARGS ${_GEN_ARGS} rtc_include_tests=false)
-endif (BUILD_TESTS)
-
-if (LIBRARY_TYPE STREQUAL STATIC)
-  set(_GEN_ARGS ${_GEN_ARGS} is_component_build=false)
-else (LIBRARY_TYPE STREQUAL STATIC)
-  set(_GEN_ARGS ${_GEN_ARGS} is_component_build=true)
-endif (LIBRARY_TYPE STREQUAL STATIC)
-
-set(_GEN_ARGS ${_GEN_ARGS} ${GN_EXTRA_ARGS})
-
-if (WIN32)
-  set(_GEN_COMMAND gn gen out/Default --args="${_GEN_ARGS}")
-elseif (UNIX)
-  set(_GEN_COMMAND gn gen out/Default --args='"${_GEN_ARGS}"')
-endif (WIN32)
-
-libwebrtc_command(
-    NAME webrtc-generate
-    COMMAND ${_GEN_COMMAND}
-    WORKING_DIRECTORY "${CMAKE_BINARY_DIR}/src"
-    COMMENT "Generating build files"
-    DEPENDS ${_NEXT_DEPENDS}
-)
-
-#
-# Run ninja
-libwebrtc_command(
-    NAME webrtc-build
-    COMMAND ninja ${NINJA_ARGS} -C out/Default
-    WORKING_DIRECTORY "${CMAKE_BINARY_DIR}/src"
-    COMMENT "Building WebRTC"
-    DEPENDS webrtc-generate
-)
-
-#
-# Link the library
-ExternalProject_Add(
-    libwebrtc
-    DEPENDS webrtc-build
-
-    INSTALL_DIR ${CMAKE_BINARY_DIR}
-    SOURCE_DIR ${CMAKE_SOURCE_DIR}/Targets/libwebrtc
-    BINARY_DIR ${CMAKE_BINARY_DIR}/libwebrtc
-
-    CMAKE_ARGS
-    -DLIBRARY_TYPE:STRING=${LIBRARY_TYPE}
-    -DTARGET_OS:STRING=${TARGET_OS}
-    -DWEBRTC_OUTPUT_DIR:PATH=${CMAKE_BINARY_DIR}/src/out/Default
-    -DWEBRTC_SOURCE_DIR:PATH=${CMAKE_BINARY_DIR}/src/webrtc
-    -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_BINARY_DIR}
-    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
-    -DINSTALL_CMAKE_DIR:PATH=${CMAKE_BINARY_DIR}/lib/cmake/LibWebRTC
-)
-
-include(Install)
-include(Package)

depot_tools/CMakeLists.txt

@@ -0,0 +1,27 @@
+if (DEPOT_TOOLS_PATH)
+  return()
+endif (DEPOT_TOOLS_PATH)
+
+include(ExternalProject)
+
+if (WIN32)
+  set(GCLIENT_EXECUTABLE ${CMAKE_BINARY_DIR}/depot_tools/gclient.bat)
+else (WIN32)
+  set(GCLIENT_EXECUTABLE ${CMAKE_BINARY_DIR}/depot_tools/gclient)
+endif (WIN32)
+
+ExternalProject_Add(
+    depot-tools
+
+    GIT_REPOSITORY https://chromium.googlesource.com/chromium/tools/depot_tools
+
+    PREFIX ${CMAKE_BINARY_DIR}/depot_tools
+
+    CONFIGURE_COMMAND ""
+    UPDATE_COMMAND ""
+    PATCH_COMMAND ""
+    BUILD_COMMAND ""
+    INSTALL_COMMAND ""
+)
+
+set(_NEXT_DEPENDS depot-tools)

webrtc/CMakeLists.txt.in

@@ -0,0 +1,110 @@
+cmake_minimum_required(VERSION 3.3)
+project(webrtc)
+
+find_package(Git REQUIRED)
+if (WIN32)
+  set(PYTHON_EXECUTABLE ${DEPOT_TOOLS_PATH}/python.bat)
+else (WIN32)
+  find_package(PythonInterp 2.7 REQUIRED)
+endif (WIN32)
+
+include(DepotTools)
+include(GClient)
+include(Environment)
+
+message(STATUS "Synchronizing webrtc")
+set(_SYNC_COMMAND ${GCLIENT_EXECUTABLE} sync --nohooks)
+execute_process(COMMAND ${PREFIX_EXECUTE} ${_SYNC_COMMAND}
+                WORKING_DIRECTORY ${WEBRTC_PARENT_DIR}
+                RESULT_VARIABLE _SYNCHRONIZED_WEBRTC)
+
+if (NOT _SYNCHRONIZED_WEBRTC EQUAL 0)
+  message(FATAL_ERROR "Unable to synchronize webrtc ${PREFIX_EXECUTE} ${_SYNC_COMMAND}")
+endif (NOT _SYNCHRONIZED_WEBRTC EQUAL 0)
+
+message(STATUS "Updating clang")
+set(_UPDATE_CLANG_COMMAND ${PYTHON_EXECUTABLE} src/tools/clang/scripts/update.py)
+execute_process(COMMAND ${PREFIX_EXECUTE} ${_UPDATE_CLANG_COMMAND}
+                WORKING_DIRECTORY ${WEBRTC_PARENT_DIR}
+                RESULT_VARIABLE _CLANG_UPDATED)
+
+if (NOT _CLANG_UPDATED EQUAL 0)
+  message(FATAL_ERROR "Unable to update clang")
+endif (NOT _CLANG_UPDATED EQUAL 0)
+
+if (UNIX AND NOT APPLE)
+  message(STATUS "Retrieving sysroot")
+  set(_SYSROOT_COMMAND ${PYTHON_EXECUTABLE} ${WEBRTC_PARENT_DIR}/src/build/linux/sysroot_scripts/install-sysroot.py --running-as-hook)
+  execute_process(COMMAND ${PREFIX_EXECUTE} ${_SYSROOT_COMMAND}
+                  WORKING_DIRECTORY ${WEBRTC_PARENT_DIR}
+                  RESULT_VARIABLE _SYSROOT_RETRIEVED)
+
+  if (NOT _SYSROOT_RETRIEVED EQUAL 0)
+    message(FATAL_ERROR "Unable to retrieve the sysroot")
+  endif (NOT _SYSROOT_RETRIEVED EQUAL 0)
+
+  set(_PLATFORM linux*)
+  set(_FOLDER linux64)
+elseif (APPLE)
+  set(_PLATFORM darwin)
+  set(_FOLDER mac)
+elseif (WIN32)
+  message(STATUS "Retrieving Visual Studio toolchain")
+  set(_TOOLCHAIN_COMMAND ${PYTHON_EXECUTABLE} src/build/vs_toolchain.py update)
+  execute_process(COMMAND ${PREFIX_EXECUTE} ${_TOOLCHAIN_COMMAND}
+                  WORKING_DIRECTORY ${WEBRTC_PARENT_DIR}
+                  RESULT_VARIABLE _VS_TOOLCHAIN_RETRIEVED)
+
+  if (NOT _VS_TOOLCHAIN_RETRIEVED EQUAL 0)
+    message(FATAL_ERROR "Unable to retrieve Visual Studio toolchain")
+  endif (NOT _VS_TOOLCHAIN_RETRIEVED EQUAL 0)
+
+  set(_PLATFORM win32)
+  set(_FOLDER win)
+  set(_SUFFIX .exe)
+endif (UNIX AND NOT APPLE)
+
+message(STATUS "Fetching gn${_SUFFIX} for ${_PLATFORM}")
+set(_GN_COMMAND download_from_google_storage --no_resume --platform=${_PLATFORM}
+    --no_auth --bucket chromium-gn
+    -s src/buildtools/${_FOLDER}/gn${_SUFFIX}.sha1)
+execute_process(COMMAND ${PREFIX_EXECUTE} ${_GN_COMMAND}
+                WORKING_DIRECTORY ${WEBRTC_PARENT_DIR}
+                RESULT_VARIABLE _GN_RETRIEVED)
+
+if (NOT _GN_RETRIEVED EQUAL 0)
+  message(FATAL_ERROR "Unable to retrieve clang-format${_SUFFIX}")
+endif (NOT _GN_RETRIEVED EQUAL 0)
+
+message(STATUS "Fetching clang-format${_SUFFIX} for ${_PLATFORM}")
+set(_CLANG_FORMAT_COMMAND download_from_google_storage --no_resume
+    --platform=${_PLATFORM} --no_auth --bucket chromium-clang-format
+    -s src/buildtools/${_FOLDER}/clang-format${_SUFFIX}.sha1)
+execute_process(COMMAND ${PREFIX_EXECUTE} ${_CLANG_FORMAT_COMMAND}
+                WORKING_DIRECTORY ${WEBRTC_PARENT_DIR}
+                RESULT_VARIABLE _CLANG_FORMAT_RETRIEVED)
+
+if (NOT _CLANG_FORMAT_RETRIEVED EQUAL 0)
+  message(FATAL_ERROR "Unable to retrieve clang-format${_SUFFIX}")
+endif (NOT _CLANG_FORMAT_RETRIEVED EQUAL 0)
+
+include(Gn)
+
+message(STATUS "Generating build files: ${_GEN_COMMAND}")
+execute_process(COMMAND ${PREFIX_EXECUTE} ${_GEN_COMMAND}
+                WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+                RESULT_VARIABLE _BUILD_GENERATED)
+
+if (NOT _BUILD_GENERATED EQUAL 0)
+  message(FATAL_ERROR "Unable to execute ${_GEN_COMMAND}")
+endif (NOT _BUILD_GENERATED EQUAL 0)
+
+message(STATUS "Running ninja")
+set(_NINJA_COMMAND ninja ${NINJA_ARGS} -C out/Default)
+execute_process(COMMAND ${PREFIX_EXECUTE} ${_NINJA_COMMAND}
+                WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+                RESULT_VARIABLE _NINJA_DONE)
+
+if (NOT _NINJA_DONE EQUAL 0)
+  message(FATAL_ERROR "Unable to build webrtc")
+endif (NOT _NINJA_DONE EQUAL 0)