Externals: Add libcurl.

CMakeLists.txt

@@ -16,6 +16,14 @@ option(ENABLE_LTO "Enables Link Time Optimization" OFF)
 option(ENABLE_GENERIC "Enables generic build that should run on any little-endian host" OFF)
 option(ENABLE_HEADLESS "Enables running Dolphin as a headless variant" OFF)
 
+# Maintainers: if you consider blanket disabling this for your users, please
+# consider the following points:
+#  * No data is being sent without explicit user approval (pop up box at first
+#    launch).
+#  * The Dolphin team relies on the data in order to understand the behavior
+#    of our software in the wild.
+option(ENABLE_ANALYTICS "Enables opt-in Analytics collection" ON)
+
 # Enable SDL for default on operating systems that aren't OSX, Android, Linux or Windows.
 if(NOT APPLE AND NOT ANDROID AND NOT ${CMAKE_SYSTEM_NAME} STREQUAL "Linux" AND NOT MSVC)
 	option(ENABLE_SDL "Enables SDL as a generic controller backend" ON)
@@ -587,6 +595,11 @@ if(UNIX)
 	add_definitions(-DUSE_MEMORYWATCHER=1)
 endif()
 
+if(ENABLE_ANALYTICS)
+	message("Enabling analytics collection (subject to end-user opt-in)")
+	add_definitions(-DUSE_ANALYTICS=1)
+endif()
+
 ########################################
 # Setup include directories (and make sure they are preferred over the Externals)
 #
@@ -765,6 +778,17 @@ else()
 	include_directories(Externals/mbedtls/include)
 endif()
 
+include(FindCURL OPTIONAL)
+if(CURL_FOUND)
+	message("Using shared libcurl")
+	include_directories(${CURL_INCLUDE_DIRS})
+else()
+	message("Using static libcurl from Externals")
+	add_subdirectory(Externals/curl)
+	set(CURL_LIBRARIES curl)
+	include_directories(BEFORE Externals/curl/include)
+endif()
+
 if(NOT APPLE)
 	check_lib(SOIL "(no .pc for SOIL)" SOIL SOIL/SOIL.h QUIET)
 endif()