Fetch and compile cmake targets

.gitmodules

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+[submodule "Dependencies/depot_tools"]
+	path = Dependencies/depot_tools
+	url = https://chromium.googlesource.com/chromium/tools/depot_tools.git

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.2)
+project(libwebrtc)
+
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH}
+    ${CMAKE_SOURCE_DIR}/CMakeModules)
+
+find_package(Git REQUIRED)
+find_package(DepotTools REQUIRED)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+
+set(WEBRTC_CHROMIUM_DEPS git@github.com:aisouard/libwebrtc-chromium-deps.git)
+
+add_subdirectory(Targets)

CMakeModules/FindDepotTools.cmake

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+find_program(DEPOTTOOLS_GCLIENT_EXECUTABLE
+        NAMES gclient gclient.bat
+        PATHS ${CMAKE_CURRENT_SOURCE_DIR}/Dependencies/depot_tools
+        )
+
+include(${CMAKE_ROOT}/Modules/FindPackageHandleStandardArgs.cmake)
+find_package_handle_standard_args(DepotTools
+        REQUIRED_VARS DEPOTTOOLS_GCLIENT_EXECUTABLE
+        FAIL_MESSAGE "Could not find the gclient executable."
+        )

Dependencies/depot_tools

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+Subproject commit 15ab08227b961ddce83db7e41fb83b9288ff9ccc

Targets/Build/CMakeLists.txt

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+#
+# Generate build files
+#
+
+add_custom_command(
+        OUTPUT  ${CMAKE_BINARY_DIR}/Nevermind
+        COMMAND ${CMAKE_COMMAND} -E env \"PATH=${CMAKE_SOURCE_DIR}/Dependencies/depot_tools:$ENV{PATH}\" gn gen out/Default --args='is_debug=false rtc_include_tests=false'
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/src
+        COMMENT "Generate build files"
+)
+
+add_custom_target(
+        webrtc_generate_build ALL
+        DEPENDS ${CMAKE_BINARY_DIR}/Nevermind
+)
+
+add_dependencies(webrtc_generate_build webrtc_links)
+
+#
+# Run ninja
+#
+
+add_custom_command(
+        OUTPUT  ${CMAKE_BINARY_DIR}/src/out/Default/obj/root.stamp
+        COMMAND ${CMAKE_COMMAND} -E env \"PATH=${CMAKE_SOURCE_DIR}/Dependencies/depot_tools:$ENV{PATH}\" ninja -C out/Default
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/src
+        COMMENT "Build WebRTC"
+)
+
+add_custom_target(
+        webrtc_build ALL
+        DEPENDS ${CMAKE_BINARY_DIR}/src/out/Default/obj/root.stamp
+)
+
+add_dependencies(webrtc_build webrtc_generate_build)
+
+#
+# Merge libraries into a single one
+#
+
+add_custom_command(
+        OUTPUT  ${CMAKE_BINARY_DIR}/libwebrtc.a
+        COMMAND python webrtc/build/merge_libs.py out/Default ${CMAKE_BINARY_DIR}/libwebrtc.a
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/src
+        COMMENT "Merging libraries into libwebrtc.a"
+)
+
+add_custom_target(
+        webrtc_merge ALL
+        DEPENDS ${CMAKE_BINARY_DIR}/libwebrtc.a
+)
+
+add_dependencies(webrtc_merge webrtc_build)

Targets/CMakeLists.txt

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+add_subdirectory(Fetch)
+add_subdirectory(Build)
+add_subdirectory(Test)
+add_subdirectory(Install)

Targets/Fetch/CMakeLists.txt

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+#
+# Fetch
+#
+
+set(gclient_config
+        ${DEPOTTOOLS_GCLIENT_EXECUTABLE} config --name src
+        https://chromium.googlesource.com/external/webrtc.git
+)
+
+add_custom_command(
+        OUTPUT  ${CMAKE_BINARY_DIR}/.gclient
+        COMMAND ${gclient_config}
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+        COMMENT "Configuring gclient to pull webrtc code"
+)
+
+add_custom_target(
+        webrtc_config ALL
+        DEPENDS ${CMAKE_BINARY_DIR}/.gclient
+)
+
+#
+# Sync
+#
+
+set(gclient_sync
+        ${DEPOTTOOLS_GCLIENT_EXECUTABLE} sync -n -D
+)
+
+if(WEBRTC_REVISION)
+    set(gclient_sync ${gclient_sync} -r ${WEBRTC_REVISION})
+endif()
+
+add_custom_command(
+        OUTPUT  ${CMAKE_BINARY_DIR}/src/all.gyp
+        COMMAND ${gclient_sync}
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+        COMMENT "Retrieving WebRTC source code"
+)
+
+add_custom_target(
+        webrtc_sync ALL
+        DEPENDS ${CMAKE_BINARY_DIR}/src/all.gyp
+)
+
+add_dependencies(webrtc_sync webrtc_config)
+
+#
+# Sync Chromium
+#
+
+add_custom_command(
+        OUTPUT  ${CMAKE_BINARY_DIR}/src/chromium/src/DEPS
+        COMMAND git clone ${WEBRTC_CHROMIUM_DEPS} ${CMAKE_BINARY_DIR}/src/chromium/src
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+        COMMENT "Retrieving Chromium dependencies"
+)
+
+add_custom_target(
+        webrtc_chromium_deps ALL
+        DEPENDS ${CMAKE_BINARY_DIR}/src/chromium/src/DEPS
+)
+
+add_dependencies(webrtc_chromium_deps webrtc_sync)
+
+#
+# Setup Links
+#
+
+add_custom_command(
+        OUTPUT  ${CMAKE_BINARY_DIR}/src/build
+        COMMAND ${CMAKE_COMMAND} -E env \"PATH=${CMAKE_SOURCE_DIR}/Dependencies/depot_tools:$ENV{PATH}\" python setup_links.py
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/src
+        COMMENT "Creating symbolic links"
+)
+
+add_custom_target(
+        webrtc_links ALL
+        DEPENDS ${CMAKE_BINARY_DIR}/src/build
+)
+
+add_dependencies(webrtc_links webrtc_chromium_deps)
+
+#
+# Remove examples
+#
+
+add_custom_command(
+        OUTPUT  None
+        COMMAND sed -i "s/'include_examples%': 1/'include_examples%': 0/g" src/all.gyp
+        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+        COMMENT "Patching build files"
+)
+
+add_custom_target(
+        webrtc_patch ALL
+        DEPENDS None
+)
+
+add_dependencies(webrtc_patch webrtc_links)