cmake: Download Boost if inadequate local version
Building SDL2 from externals is incompatible with Conan's version of libiconv, a requirement of Conan's Boost package. Solution is to use the same Boost package in use by the linux-fresh container. This tells CMake to download boost_1_75_0.tar.xz from yuzu-emu/ext-linux-bin at CMake's configuration step, much the same way Qt and FFmpeg are downloaded for Windows. Also makes DownloadExternals.cmake cross-platform. Although the CMake code is not entirely specific to Linux, only Linux has Boost libraries available at ext-linux-bin, whereas there is no equivalent Boost package for Windows at ext-windows-bin. caveat emptor
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		| @@ -4,15 +4,29 @@ | ||||
| #   remote_path: path to the file to download, relative to the remote repository root | ||||
| #   prefix_var: name of a variable which will be set with the path to the extracted contents | ||||
| function(download_bundled_external remote_path lib_name prefix_var) | ||||
|  | ||||
| set(package_repo "no_platform") | ||||
| set(package_extension "no_platform") | ||||
| if (WIN32) | ||||
|     set(package_repo "ext-windows-bin/raw/master/") | ||||
|     set(package_extension ".7z") | ||||
| elseif (${CMAKE_SYSTEM_NAME} STREQUAL "Linux") | ||||
|     set(package_repo "ext-linux-bin/raw/main/") | ||||
|     set(package_extension ".tar.xz") | ||||
| else() | ||||
|     message(FATAL_ERROR "No package available for this platform") | ||||
| endif() | ||||
| set(package_url "https://github.com/yuzu-emu/${package_repo}") | ||||
|  | ||||
| set(prefix "${CMAKE_BINARY_DIR}/externals/${lib_name}") | ||||
| if (NOT EXISTS "${prefix}") | ||||
|     message(STATUS "Downloading binaries for ${lib_name}...") | ||||
|     file(DOWNLOAD | ||||
|         https://github.com/yuzu-emu/ext-windows-bin/raw/master/${remote_path}${lib_name}.7z | ||||
|         "${CMAKE_BINARY_DIR}/externals/${lib_name}.7z" SHOW_PROGRESS) | ||||
|     execute_process(COMMAND ${CMAKE_COMMAND} -E tar xf "${CMAKE_BINARY_DIR}/externals/${lib_name}.7z" | ||||
|         ${package_url}${remote_path}${lib_name}${package_extension} | ||||
|         "${CMAKE_BINARY_DIR}/externals/${lib_name}${package_extension}" SHOW_PROGRESS) | ||||
|     execute_process(COMMAND ${CMAKE_COMMAND} -E tar xf "${CMAKE_BINARY_DIR}/externals/${lib_name}${package_extension}" | ||||
|         WORKING_DIRECTORY "${CMAKE_BINARY_DIR}/externals") | ||||
| endif() | ||||
| message(STATUS "Using bundled binaries at ${prefix}") | ||||
| set(${prefix_var} "${prefix}" PARENT_SCOPE) | ||||
| endfunction() | ||||
| endfunction() | ||||
|   | ||||
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