diff options
Diffstat (limited to 'cmake/Platform/Emscripten.cmake')
| -rw-r--r-- | cmake/Platform/Emscripten.cmake | 106 |
1 files changed, 91 insertions, 15 deletions
diff --git a/cmake/Platform/Emscripten.cmake b/cmake/Platform/Emscripten.cmake index aafd38a8..9bfa829d 100644 --- a/cmake/Platform/Emscripten.cmake +++ b/cmake/Platform/Emscripten.cmake @@ -1,48 +1,124 @@ # This file is a 'toolchain description file' for CMake. -# It teaches CMake about the Emscripten compiler, so that CMake can generate Unix Makefiles +# It teaches CMake about the Emscripten compiler, so that CMake can generate makefiles # from CMakeLists.txt that invoke emcc. # To use this toolchain file with CMake, invoke CMake with the following command line parameters -# cmake -DEMSCRIPTEN=1 -# -DCMAKE_TOOLCHAIN_FILE=<EmscriptenRoot>/cmake/Platform/Emscripten.cmake -# -DCMAKE_MODULE_PATH=<EmscriptenRoot>/cmake +# cmake -DCMAKE_TOOLCHAIN_FILE=<EmscriptenRoot>/cmake/Platform/Emscripten.cmake # -DCMAKE_BUILD_TYPE=<Debug|RelWithDebInfo|Release|MinSizeRel> -# -G "Unix Makefiles" +# -G "Unix Makefiles" (Linux and OSX) +# -G "MinGW Makefiles" (Windows) # <path/to/CMakeLists.txt> # Note, pass in here ONLY the path to the file, not the filename 'CMakeLists.txt' itself. # After that, build the generated Makefile with the command 'make'. On Windows, you may download and use 'mingw32-make' instead. -# the name of the target operating system -set(CMAKE_SYSTEM_NAME Emscripten) +# The following variable describes the target OS we are building to. +# Ideally, this could be 'Emscripten', but as Emscripten mimics the Linux platform, setting this to Linux will allow more of existing software to build. +# Be sure to run Emscripten test_openjpeg if planning to change this. +set(CMAKE_SYSTEM_NAME Linux) set(CMAKE_SYSTEM_VERSION 1) +set(CMAKE_CROSSCOMPILING TRUE) + +# Do a no-op access on the CMAKE_TOOLCHAIN_FILE variable so that CMake will not issue a warning on it being unused. +if (CMAKE_TOOLCHAIN_FILE) +endif() + +# Locate where the Emscripten compiler resides in relative to this toolchain file. if ("${EMSCRIPTEN_ROOT_PATH}" STREQUAL "") - set(CMAKE_FIND_ROOT_PATH "$ENV{EMSCRIPTEN}") + get_filename_component(GUESS_EMSCRIPTEN_ROOT_PATH "${CMAKE_CURRENT_LIST_DIR}/../../" ABSOLUTE) + if (EXISTS "${GUESS_EMSCRIPTEN_ROOT_PATH}/emranlib") + set(EMSCRIPTEN_ROOT_PATH "${GUESS_EMSCRIPTEN_ROOT_PATH}") + endif() +endif() + +# If not found by above search, locate using the EMSCRIPTEN environment variable. +if ("${EMSCRIPTEN_ROOT_PATH}" STREQUAL "") + set(EMSCRIPTEN_ROOT_PATH "$ENV{EMSCRIPTEN}") +endif() + +# Abort if not found. +if ("${EMSCRIPTEN_ROOT_PATH}" STREQUAL "") + message(FATAL_ERROR "Could not locate the Emscripten compiler toolchain directory! Either set the EMSCRIPTEN environment variable, or pass -DEMSCRIPTEN_ROOT_PATH=xxx to CMake to explicitly specify the location of the compiler!") +endif() + +# Normalize, convert Windows backslashes to forward slashes or CMake will crash. +get_filename_component(EMSCRIPTEN_ROOT_PATH "${EMSCRIPTEN_ROOT_PATH}" ABSOLUTE) + +if ("${CMAKE_MODULE_PATH}" STREQUAL "") + set(CMAKE_MODULE_PATH "${EMSCRIPTEN_ROOT_PATH}/cmake") +endif() + +set(CMAKE_FIND_ROOT_PATH "${EMSCRIPTEN_ROOT_PATH}/cmake") + +if (CMAKE_HOST_WIN32) + set(EMCC_SUFFIX ".bat") else() - set(CMAKE_FIND_ROOT_PATH "${EMSCRIPTEN_ROOT_PATH}") + set(EMCC_SUFFIX "") endif() # Specify the compilers to use for C and C++ if ("${CMAKE_C_COMPILER}" STREQUAL "") - set(CMAKE_C_COMPILER "emcc.bat") - set(CMAKE_CXX_COMPILER "em++.bat") - set(CMAKE_AR "emar.bat") - set(CMAKE_RANLIB "emranlib.bat") + set(CMAKE_C_COMPILER "${EMSCRIPTEN_ROOT_PATH}/emcc${EMCC_SUFFIX}") +endif() +if ("${CMAKE_CXX_COMPILER}" STREQUAL "") + set(CMAKE_CXX_COMPILER "${EMSCRIPTEN_ROOT_PATH}/em++${EMCC_SUFFIX}") +endif() + +if ("${CMAKE_AR}" STREQUAL "") + set(CMAKE_AR "${EMSCRIPTEN_ROOT_PATH}/emar${EMCC_SUFFIX}") +endif() + +if ("${CMAKE_RANLIB}" STREQUAL "") + set(CMAKE_RANLIB "${EMSCRIPTEN_ROOT_PATH}/emranlib${EMCC_SUFFIX}") endif() +# Don't do compiler autodetection, since we are cross-compiling. +include(CMakeForceCompiler) +CMAKE_FORCE_C_COMPILER("${CMAKE_C_COMPILER}" Clang) +CMAKE_FORCE_CXX_COMPILER("${CMAKE_CXX_COMPILER}" Clang) + set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH) set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY) +# We would prefer to specify a standard set of Clang+Emscripten-friendly common convention for suffix files, especially for CMake executable files, +# but if these are adjusted, ${CMAKE_ROOT}/Modules/CheckIncludeFile.cmake will fail, since it depends on being able to compile output files with predefined names. +#SET(CMAKE_LINK_LIBRARY_SUFFIX "") +#SET(CMAKE_STATIC_LIBRARY_PREFIX "") +#SET(CMAKE_STATIC_LIBRARY_SUFFIX ".bc") +#SET(CMAKE_SHARED_LIBRARY_PREFIX "") +#SET(CMAKE_SHARED_LIBRARY_SUFFIX ".bc") +#IF (NOT CMAKE_EXECUTABLE_SUFFIX) +# SET(CMAKE_EXECUTABLE_SUFFIX ".js") +#endif() +#SET(CMAKE_FIND_LIBRARY_PREFIXES "") +#SET(CMAKE_FIND_LIBRARY_SUFFIXES ".bc") + +SET(CMAKE_C_USE_RESPONSE_FILE_FOR_OBJECTS 1) +SET(CMAKE_CXX_USE_RESPONSE_FILE_FOR_OBJECTS 1) +SET(CMAKE_C_USE_RESPONSE_FILE_FOR_INCLUDES 1) +SET(CMAKE_CXX_USE_RESPONSE_FILE_FOR_INCLUDES 1) + +set(CMAKE_C_RESPONSE_FILE_LINK_FLAG "@") +set(CMAKE_CXX_RESPONSE_FILE_LINK_FLAG "@") + # Specify the program to use when building static libraries. Force Emscripten-related command line options to clang. -set(CMAKE_CXX_ARCHIVE_CREATE "${CMAKE_CXX_COMPILER} -o <TARGET> -emit-llvm <LINK_FLAGS> <OBJECTS>") -set(CMAKE_C_ARCHIVE_CREATE "${CMAKE_C_COMPILER} -o <TARGET> -emit-llvm <LINK_FLAGS> <OBJECTS>") +set(CMAKE_CXX_ARCHIVE_CREATE "${CMAKE_CXX_COMPILER} ${CMAKE_START_TEMP_FILE} -o <TARGET> -emit-llvm <LINK_FLAGS> <OBJECTS>${CMAKE_END_TEMP_FILE}") +set(CMAKE_C_ARCHIVE_CREATE "${CMAKE_C_COMPILER} ${CMAKE_START_TEMP_FILE} -o <TARGET> -emit-llvm <LINK_FLAGS> <OBJECTS>${CMAKE_END_TEMP_FILE}") # Set a global EMSCRIPTEN variable that can be used in client CMakeLists.txt to detect when building using Emscripten. # 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". set(EMSCRIPTEN 1) +# We are cross-compiling, so unset the common CMake variables that represent the target platform. Leave UNIX define enabled, since Emscripten +# mimics a Linux environment. +SET(WIN32) +SET(APPLE) + +set(CMAKE_C_SIZEOF_DATA_PTR 4) +set(CMAKE_CXX_SIZEOF_DATA_PTR 4) + set(CMAKE_C_FLAGS_RELEASE "-DNDEBUG" CACHE STRING "Emscripten-overridden CMAKE_C_FLAGS_RELEASE") set(CMAKE_C_FLAGS_MINSIZEREL "-DNDEBUG" CACHE STRING "Emscripten-overridden CMAKE_C_FLAGS_MINSIZEREL") set(CMAKE_C_FLAGS_RELWITHDEBINFO "" CACHE STRING "Emscripten-overridden CMAKE_C_FLAGS_RELWITHDEBINFO") |