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Added cmake toolchain file for Emscripten and a other.test_cmake to tests its functionality.
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‎cmake/Platform/Emscripten.cmake‎

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# This file is a 'toolchain description file' for CMake.
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# It teaches CMake about the Emscripten compiler, so that CMake can generate Unix Makefiles
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# from CMakeLists.txt that invoke emcc.
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# To use this toolchain file with CMake, invoke CMake with the following command line parameters
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# cmake -DEMSCRIPTEN=1
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# -DCMAKE_TOOLCHAIN_FILE=<EmscriptenRoot>/cmake/Platform/Emscripten.cmake
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# -DCMAKE_MODULE_PATH=<EmscriptenRoot>/cmake
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# -DCMAKE_BUILD_TYPE=<Debug|RelWithDebInfo|Release|MinSizeRel>
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# -G "Unix Makefiles"
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# <path/to/CMakeLists.txt> # Note, pass in here ONLY the path to the file, not the filename 'CMakeLists.txt' itself.
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# After that, build the generated Makefile with the command 'make'. On Windows, you may download and use 'mingw32-make' instead.
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# the name of the target operating system
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SET(CMAKE_SYSTEM_NAME Emscripten)
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SET(CMAKE_SYSTEM_VERSION 1)
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if ("$ENV{EMCC_BIN}" STREQUAL "")
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message(ERROR "Environment variable EMCC_BIN has not been set! Please point it to Emscripten root directory!")
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endif()
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#message(STATUS "CMake is using Emscripten toolchain file, Emscripten root path '$ENV{EMCC_BIN}'.")
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SET(CMAKE_FIND_ROOT_PATH $ENV{EMCC_BIN})
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FILE(TO_CMAKE_PATH "$ENV{EMCC_BIN}" EMCC_PATH)
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# Specify the compilers to use for C and C++
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SET(CMAKE_C_COMPILER ${EMCC_PATH}/emcc)
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SET(CMAKE_CXX_COMPILER ${EMCC_PATH}/em++)
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SET(CMAKE_AR ${EMCC_PATH}/emar)
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SET(CMAKE_RANLIB ${EMCC_PATH}/emranlib)
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set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
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set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
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set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)
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set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
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# Specify the program to use when building static libraries. Force Emscripten-related command line options to clang.
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SET(CMAKE_CXX_ARCHIVE_CREATE "${CMAKE_CXX_COMPILER} -o <TARGET> -emit-llvm <LINK_FLAGS> <OBJECTS>")
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SET(CMAKE_C_ARCHIVE_CREATE "${CMAKE_C_COMPILER} -o <TARGET> -emit-llvm <LINK_FLAGS> <OBJECTS>")
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# Set a global EMSCRIPTEN variable that can be used in client CMakeLists.txt to detect when building using Emscripten.
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# There seems to be some kind of bug with CMake, so you might need to define this manually on the command line with "-DEMSCRIPTEN=1".
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SET(EMSCRIPTEN 1)

‎tests/cmake/target_html/CMakeLists.txt‎

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cmake_minimum_required(VERSION 2.8)
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project(hello_world_gles.html)
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file(GLOB sourceFiles ../../hello_world_gles.c)
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if (CMAKE_BUILD_TYPE STREQUAL Debug)
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SET(linkFlags "")
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else() # Either MinSizeRel, RelWithDebInfo or Release, all which run with optimizations enabled.
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SET(linkFlags "-O2")
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endif()
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add_executable(hello_world_gles.html ${sourceFiles})
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set_target_properties(hello_world_gles.html PROPERTIES LINK_FLAGS "${linkFlags}")

‎tests/cmake/target_js/CMakeLists.txt‎

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cmake_minimum_required(VERSION 2.8)
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project(hello_world.js)
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file(GLOB sourceFiles ../../hello_world.cpp)
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if (CMAKE_BUILD_TYPE STREQUAL Debug)
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SET(linkFlags "")
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else() # Either MinSizeRel, RelWithDebInfo or Release, all which run with optimizations enabled.
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SET(linkFlags "-O2")
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endif()
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add_executable(hello_world.js ${sourceFiles})
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set_target_properties(hello_world.js PROPERTIES LINK_FLAGS "${linkFlags}")

‎tests/runner.py‎

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# TODO: test normal project linking, static and dynamic: get_library should not need to be told what to link!
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# TODO: deprecate llvm optimizations, dlmalloc, etc. in emscripten.py.
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def test_cmake(self):
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emscriptencmaketoolchain = path_from_root('cmake', 'Platform', 'Emscripten.cmake')
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# On Windows, we want to build cmake-generated Makefiles with mingw32-make instead of e.g. cygwin make, since mingw32-make
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# understands Windows paths, and cygwin make additionally produces a cryptic 'not valid bitcode file' errors on files that
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# *are* valid bitcode files.
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if os.name == 'nt':
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make_command = 'mingw32-make'
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else:
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make_command = 'make'
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cmake_cases = ['target_js', 'target_html']
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cmake_outputs = ['hello_world.js', 'hello_world_gles.html']
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for i in range(0, 2):
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for configuration in ['Debug', 'Release']:
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# Create a temp workspace folder
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cmakelistsdir = path_from_root('tests', 'cmake', cmake_cases[i])
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tempdirname = tempfile.mkdtemp(prefix='emscripten_test_' + self.__class__.__name__ + '_', dir=TEMP_DIR)
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try:
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os.chdir(tempdirname)
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# Run Cmake
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cmd = ['cmake', '-DCMAKE_TOOLCHAIN_FILE='+emscriptencmaketoolchain, '-DCMAKE_BUILD_TYPE=' + configuration, '-G' 'Unix Makefiles', cmakelistsdir]
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ret = Popen(cmd, stdout=PIPE, stderr=PIPE).communicate()
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if 'error' in ret[1].lower():
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print >> sys.stderr, 'Failed command: ' + ' '.join(cmd)
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print >> sys.stderr, 'Result:\n' + ret[1]
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raise Exception('cmake call failed!') # cmake spams this silly message to stderr, so hide it: "Platform/Emscripten to use this system, please send your config file to [email protected] so it can be added to cmake"
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assert os.path.exists(tempdirname + '/Makefile'), 'CMake call did not produce a Makefile!'
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# Build
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cmd = [make_command]
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ret = Popen(cmd, stdout=PIPE).communicate()
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if 'error' in ret[0].lower() and not '0 error(s)' in ret[0].lower():
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print >> sys.stderr, 'Failed command: ' + ' '.join(cmd)
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print >> sys.stderr, 'Result:\n' + ret[0]
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raise Exception('make failed!')
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assert os.path.exists(tempdirname + '/' + cmake_outputs[i]), 'Building a cmake-generated Makefile failed to produce an output file!'
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# Run through node, if CMake produced a .js file.
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if cmake_outputs[i].endswith('.js'):
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ret = Popen([NODE_JS, tempdirname + '/' + cmake_outputs[i]], stdout=PIPE).communicate()[0]
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assert 'hello, world!' in ret, 'Running cmake-based .js application failed!'
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finally:
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os.chdir(path_from_root('tests')) # Move away from the directory we are about to remove.
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shutil.rmtree(tempdirname)
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def test_Os(self):
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for opt in ['s', '0']:
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output = Popen(['python', EMCC, path_from_root('tests', 'hello_world.c'), '-O' + opt], stdout=PIPE, stderr=PIPE).communicate()

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