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feat: add build config for Webassembly not full support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| # | ||
| # Toolchain for cross-compiling to JS using Emscripten with WebAssembly | ||
| # | ||
| # Modify EMSCRIPTEN_PREFIX to your liking; use EMSCRIPTEN environment variable | ||
| # to point to it or pass it explicitly via -DEMSCRIPTEN_PREFIX=<path>. | ||
| # | ||
| # mkdir build-emscripten-wasm && cd build-emscripten-wasm | ||
| # cmake .. -DCMAKE_TOOLCHAIN_FILE=../toolchains/wasm.toolchain.cmake | ||
| # | ||
| # On MSVC set "intelliSenseMode": "linux-gcc-x86" in CMakeSettings.json to get | ||
| # IntelliSense to work. | ||
|
|
||
| set(CMAKE_SYSTEM_NAME Emscripten) | ||
|
|
||
| # Help CMake find the platform file | ||
| set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/../modules ${CMAKE_MODULE_PATH}) | ||
|
|
||
| # Give a hand to first-time Windows users | ||
| if(CMAKE_HOST_WIN32) | ||
| if(CMAKE_GENERATOR MATCHES "Visual Studio") | ||
| message(FATAL_ERROR "Visual Studio project generator doesn't support cross-compiling to Emscripten. Please use -G Ninja or other generators instead.") | ||
| endif() | ||
| endif() | ||
|
|
||
| if(NOT EMSCRIPTEN_PREFIX) | ||
| if(DEFINED ENV{EMSCRIPTEN}) | ||
| file(TO_CMAKE_PATH "$ENV{EMSCRIPTEN}" EMSCRIPTEN_PREFIX) | ||
| # On Homebrew the sysroot is here, however emcc is also available in | ||
| # /usr/local/bin. It's impossible to figure out the sysroot from there, so | ||
| # try this first | ||
| elseif(EXISTS "/usr/local/opt/emscripten/libexec/emcc") | ||
| set(EMSCRIPTEN_PREFIX "/usr/local/opt/emscripten/libexec") | ||
| # Look for emcc in the path as a last resort | ||
| else() | ||
| find_file(_EMSCRIPTEN_EMCC_EXECUTABLE emcc) | ||
| if(EXISTS ${_EMSCRIPTEN_EMCC_EXECUTABLE}) | ||
| get_filename_component(EMSCRIPTEN_PREFIX ${_EMSCRIPTEN_EMCC_EXECUTABLE} DIRECTORY) | ||
| else() | ||
| set(EMSCRIPTEN_PREFIX "/usr/lib/emscripten") | ||
| endif() | ||
| mark_as_advanced(_EMSCRIPTEN_EMCC_EXECUTABLE) | ||
| endif() | ||
| endif() | ||
|
|
||
| if(CMAKE_HOST_WIN32) | ||
| set(EMCC_SUFFIX ".bat") | ||
| else() | ||
| set(EMCC_SUFFIX "") | ||
| endif() | ||
|
|
||
| # MSVC IntelliSense requires these variables to be put into cache: | ||
| # https://devblogs.microsoft.com/cppblog/configure-intellisense-with-cmake-toolchain-files-in-visual-studio-2019-16-9-preview-2/ | ||
| set(CMAKE_C_COMPILER "${EMSCRIPTEN_PREFIX}/emcc${EMCC_SUFFIX}" CACHE FILEPATH "C compiler" FORCE) | ||
| set(CMAKE_CXX_COMPILER "${EMSCRIPTEN_PREFIX}/em++${EMCC_SUFFIX}" CACHE FILEPATH "CXX compiler" FORCE) | ||
|
|
||
| # The `CACHE PATH "bla"` *has to be* present as otherwise CMake < 3.13.0 would | ||
| # for some reason forget the path to `ar`, calling it as `"" qc bla`, failing | ||
| # with `/bin/sh: : command not found`. This is probably related to CMP0077 in | ||
| # some way but I didn't bother investigating further. | ||
| set(CMAKE_AR "${EMSCRIPTEN_PREFIX}/emar${EMCC_SUFFIX}" CACHE PATH "Path to Emscripten ar") | ||
| set(CMAKE_RANLIB "${EMSCRIPTEN_PREFIX}/emranlib${EMCC_SUFFIX}" CACHE PATH "Path to Emscripten ranlib") | ||
| # When CMAKE_INTERPROCEDURAL_OPTIMIZATION is set, CMake apparently uses these | ||
| # instead of CMAKE_AR and such. Couldn't find any official documentation on | ||
| # why, https://github.com/emscripten-core/emscripten/issues/11143 seems to be | ||
| # the only place mentioning this. | ||
| set(CMAKE_C_COMPILER_AR "${CMAKE_AR}") | ||
| set(CMAKE_CXX_COMPILER_AR "${CMAKE_AR}") | ||
| set(CMAKE_C_COMPILER_RANLIB "${CMAKE_RANLIB}") | ||
| set(CMAKE_CXX_COMPILER_RANLIB "${CMAKE_RANLIB}") | ||
|
|
||
| # Fetch Emscripten version, needed for the below setup. Taken from | ||
| # https://github.com/emscripten-core/emscripten/blob/74d6a15644e7f6e76ed6a1da9c6937b5cb7aef6e/cmake/Modules/Platform/Emscripten.cmake#L152 | ||
| execute_process(COMMAND ${CMAKE_C_COMPILER} -v | ||
| RESULT_VARIABLE _EMSCRIPTEN_VERSION_RESULT | ||
| ERROR_VARIABLE EMSCRIPTEN_VERSION | ||
| OUTPUT_QUIET) | ||
| if(NOT _EMSCRIPTEN_VERSION_RESULT EQUAL 0) | ||
| message(FATAL_ERROR "Failed to query Emscripten version with the following output:\n${EMSCRIPTEN_VERSION}") | ||
| endif() | ||
| string(REGEX MATCH "emcc \\([^)]+\\) ([0-9\\.]+)" "\\1" "${EMSCRIPTEN_VERSION}") | ||
| if(NOT CMAKE_MATCH_1) | ||
| message(FATAL_ERROR "Failed to extract Emscripten version from the following:\n${EMSCRIPTEN_VERSION}") | ||
| endif() | ||
| set(EMSCRIPTEN_VERSION ${CMAKE_MATCH_1}) | ||
|
|
||
| # As of Emscripten 2.0.13, the whole include dir is copied over to the | ||
| # Emscripten cache dir in an attempt to have includes next to the libraries | ||
| # that were always built on-the-fly directly into the cache, such as libGL etc. | ||
| # See https://github.com/emscripten-core/emscripten/issues/9353 for the | ||
| # original discussion. Since 3.1.4, the cache dir is then the *only* sysroot | ||
| # that is complete, as it contains a generated version.h: | ||
| # https://github.com/emscripten-core/emscripten/pull/16147; and since 3.1.9 | ||
| # it's not possible to use the system directory anymore: | ||
| # https://github.com/emscripten-core/emscripten/pull/16715. | ||
| # | ||
| # The inevitable consequence is that includes updated in the system path aren't | ||
| # automatically picked up, but only after explicitly copying the files to the | ||
| # cache dir with `embuilder build sysroot --force`. See | ||
| # https://github.com/emscripten-core/emscripten/pull/13090 for related | ||
| # discussion. | ||
| # | ||
| # The code in https://github.com/emscripten-core/emscripten/blob/0566a76b500bd2bbd535e108f657fce1db7f6f75/tools/system_libs.py#L2298-L2345 | ||
| # however DOES NOT copy any binaries from lib/, only the include files, so | ||
| # <prefix>/system/lib still has to be added to CMAKE_FIND_ROOT_PATH. Yay for | ||
| # the "single sysroot" attempt, FFS. | ||
| # | ||
| # The cache dir can be queried by asking em-config. Taken from | ||
| # https://github.com/emscripten-core/emscripten/blob/74d6a15644e7f6e76ed6a1da9c6937b5cb7aef6e/cmake/Modules/Platform/Emscripten.cmake#L223 | ||
| if(NOT EMSCRIPTEN_VERSION VERSION_LESS 2.0.13) | ||
| execute_process(COMMAND ${EMSCRIPTEN_PREFIX}/em-config${EMCC_SUFFIX} CACHE | ||
| RESULT_VARIABLE _EMSCRIPTEN_CACHE_RESULT | ||
| OUTPUT_VARIABLE _EMSCRIPTEN_CACHE | ||
| ERROR_VARIABLE _EMSCRIPTEN_CACHE_ERROR | ||
| OUTPUT_STRIP_TRAILING_WHITESPACE) | ||
| if(NOT _EMSCRIPTEN_CACHE_RESULT EQUAL 0) | ||
| message(FATAL_ERROR "Failed to query Emscripten cache directory with the following output:\n${_EMSCRIPTEN_CACHE_ERROR}") | ||
| endif() | ||
| set(EMSCRIPTEN_SYSROOTS | ||
| "${_EMSCRIPTEN_CACHE}/sysroot" | ||
| "${EMSCRIPTEN_PREFIX}/system") | ||
| else() | ||
| set(EMSCRIPTEN_SYSROOTS "${EMSCRIPTEN_PREFIX}/system") | ||
| endif() | ||
|
|
||
| set(CMAKE_FIND_ROOT_PATH ${CMAKE_FIND_ROOT_PATH} | ||
| ${EMSCRIPTEN_SYSROOTS} | ||
| ${EMSCRIPTEN_PREFIX}) | ||
|
|
||
| set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) | ||
| set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) | ||
| set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY) | ||
|
|
||
| # Otherwise FindCorrade fails to find _CORRADE_MODULE_DIR. Why the heck is this | ||
| # not implicit is beyond me. | ||
| set(CMAKE_SYSTEM_PREFIX_PATH ${CMAKE_FIND_ROOT_PATH}) | ||
|
|
||
| # Compared to the classic (asm.js) compilation, -s WASM=1 is added to both | ||
| # compiler and linker. The *_INIT variables are available since CMake 3.7, so | ||
| # it won't work in earlier versions. Sorry. | ||
| cmake_minimum_required(VERSION 3.7) | ||
| set(CMAKE_EXE_LINKER_FLAGS_INIT "-s WASM=1") | ||
| set(CMAKE_CXX_FLAGS_RELEASE_INIT "-DNDEBUG -O3 -flto") | ||
| set(CMAKE_EXE_LINKER_FLAGS_RELEASE_INIT "-O3 -flto") |