Add external_webrtc library.

external/CMakeLists.txt

@@ -59,5 +59,6 @@ if (LINUX AND NOT DESKTOP_APP_DISABLE_DBUS_INTEGRATION)
 endif()
 add_checked_subdirectory(ton)
 add_checked_subdirectory(variant)
+add_checked_subdirectory(webrtc)
 add_checked_subdirectory(xxhash)
 add_checked_subdirectory(zlib)

external/webrtc/CMakeLists.txt

@@ -0,0 +1,46 @@
+# This file is part of Desktop App Toolkit,
+# a set of libraries for developing nice desktop applications.
+#
+# For license and copyright information please follow this link:
+# https://github.com/desktop-app/legal/blob/master/LEGAL
+
+add_library(external_webrtc INTERFACE IMPORTED GLOBAL)
+add_library(desktop-app::external_webrtc ALIAS external_webrtc)
+
+set(webrtc_loc ${libs_loc}/webrtc/src)
+set(webrtc_build_loc ${webrtc_loc}/out/$<CONFIG>/obj)
+if (WIN32)
+    set(webrtc_lib_prefix $<CONFIG>/)
+    set(webrtc_lib_suffix .lib)
+
+    target_compile_definitions(external_webrtc
+    INTERFACE
+        WEBRTC_WIN
+    )
+else()
+    set(webrtc_lib_prefix lib)
+    set(webrtc_lib_suffix .a)
+
+    target_compile_definitions(external_webrtc
+    INTERFACE
+        WEBRTC_POSIX
+    )
+endif()
+
+target_include_directories(external_webrtc
+INTERFACE
+    ${webrtc_loc}
+    ${webrtc_loc}/third_party/abseil-cpp
+)
+
+set(webrtc_libs
+    webrtc
+)
+foreach (lib ${webrtc_libs})
+    list(APPEND webrtc_libs_list "${webrtc_build_loc}/${lib}${webrtc_lib_suffix}")
+endforeach()
+
+target_link_libraries(external_webrtc
+INTERFACE
+    ${webrtc_libs_list}
+)