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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 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 -DCMAKE_TOOLCHAIN_FILE=<EmscriptenRoot>/cmake/Modules/Platform/Emscripten.cmake
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# -DCMAKE_BUILD_TYPE=<Debug|RelWithDebInfo|Release|MinSizeRel>
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# -G "Unix Makefiles" (Linux and OSX)
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# -G "MinGW Makefiles" (Windows)
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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 following variable describes the target OS we are building to.
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set(CMAKE_SYSTEM_NAME Emscripten)
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set(CMAKE_SYSTEM_VERSION 1)
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set(CMAKE_CROSSCOMPILING TRUE)
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# Advertise Emscripten as a 32-bit platform (as opposed to CMAKE_SYSTEM_PROCESSOR=x86_64 for 64-bit platform),
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# since some projects (e.g. OpenCV) use this to detect bitness.
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set(CMAKE_SYSTEM_PROCESSOR x86)
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# Tell CMake how it should instruct the compiler to generate multiple versions of an outputted .so library: e.g. "libfoo.so, libfoo.so.1, libfoo.so.1.4" etc.
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# This feature is activated if a shared library project has the property SOVERSION defined.
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set(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-Wl,-soname,")
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# In CMake, CMAKE_HOST_WIN32 is set when we are cross-compiling from Win32 to Emscripten: http://www.cmake.org/cmake/help/v2.8.12/cmake.html#variable:CMAKE_HOST_WIN32
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# The variable WIN32 is set only when the target arch that will run the code will be WIN32, so unset WIN32 when cross-compiling.
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set(WIN32)
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# The same logic as above applies for APPLE and CMAKE_HOST_APPLE, so unset APPLE.
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set(APPLE)
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+ − 35
# And for UNIX and CMAKE_HOST_UNIX. However, Emscripten is often able to mimic being a Linux/Unix system, in which case a lot of existing CMakeLists.txt files can be configured for Emscripten while assuming UNIX build, so this is left enabled.
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set(UNIX 1)
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# Do a no-op access on the CMAKE_TOOLCHAIN_FILE variable so that CMake will not issue a warning on it being unused.
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if(CMAKE_TOOLCHAIN_FILE)
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endif()
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# In order for check_function_exists() detection to work, we must signal it to pass an additional flag, which causes the compilation
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# to abort if linking results in any undefined symbols. The CMake detection mechanism depends on the undefined symbol error to be raised.
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set(CMAKE_REQUIRED_FLAGS "-s ERROR_ON_UNDEFINED_SYMBOLS=1")
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# Locate where the Emscripten compiler resides in relative to this toolchain file.
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if("${EMSCRIPTEN_ROOT_PATH}" STREQUAL "")
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get_filename_component(GUESS_EMSCRIPTEN_ROOT_PATH "${CMAKE_CURRENT_LIST_DIR}/../../../" ABSOLUTE)
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if(EXISTS "${GUESS_EMSCRIPTEN_ROOT_PATH}/emranlib")
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set(EMSCRIPTEN_ROOT_PATH "${GUESS_EMSCRIPTEN_ROOT_PATH}")
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endif()
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endif()
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# If not found by above search, locate using the EMSCRIPTEN environment variable.
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if("${EMSCRIPTEN_ROOT_PATH}" STREQUAL "")
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set(EMSCRIPTEN_ROOT_PATH "$ENV{EMSCRIPTEN}")
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endif()
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# Abort if not found.
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if("${EMSCRIPTEN_ROOT_PATH}" STREQUAL "")
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message(FATAL_ERROR "Could not locate the Emscripten compiler toolchain directory! Set the EMSCRIPTEN environment variable to explicitly specify the location of the compiler! This usually matches EMSCRIPTEN_ROOT from your ~/.emscripten file.")
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endif()
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# Normalize, convert Windows backslashes to forward slashes or CMake will crash.
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get_filename_component(EMSCRIPTEN_ROOT_PATH "${EMSCRIPTEN_ROOT_PATH}" ABSOLUTE)
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if(NOT CMAKE_MODULE_PATH)
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set(CMAKE_MODULE_PATH "")
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endif()
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set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${EMSCRIPTEN_ROOT_PATH}/cmake/Modules")
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set(CMAKE_FIND_ROOT_PATH "${EMSCRIPTEN_ROOT_PATH}/system")
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+ − 74
if(CMAKE_HOST_WIN32)
+ − 75
set(EMCC_SUFFIX ".bat")
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else()
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set(EMCC_SUFFIX "")
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endif()
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# Specify the compilers to use for C and C++
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if("${CMAKE_C_COMPILER}" STREQUAL "")
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set(CMAKE_C_COMPILER "${EMSCRIPTEN_ROOT_PATH}/emcc${EMCC_SUFFIX}")
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endif()
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if("${CMAKE_CXX_COMPILER}" STREQUAL "")
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set(CMAKE_CXX_COMPILER "${EMSCRIPTEN_ROOT_PATH}/em++${EMCC_SUFFIX}")
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endif()
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if("${CMAKE_AR}" STREQUAL "")
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set(CMAKE_AR "${EMSCRIPTEN_ROOT_PATH}/emar${EMCC_SUFFIX}" CACHE FILEPATH "Emscripten ar")
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endif()
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if("${CMAKE_RANLIB}" STREQUAL "")
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set(CMAKE_RANLIB "${EMSCRIPTEN_ROOT_PATH}/emranlib${EMCC_SUFFIX}" CACHE FILEPATH "Emscripten ranlib")
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endif()
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# Don't do compiler autodetection, since we are cross-compiling.
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include(CMakeForceCompiler)
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CMAKE_FORCE_C_COMPILER("${CMAKE_C_COMPILER}" Clang)
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CMAKE_FORCE_CXX_COMPILER("${CMAKE_CXX_COMPILER}" Clang)
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# To find programs to execute during CMake run time with find_program(), e.g. 'git' or so, we allow looking
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# into system paths.
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set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
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# Since Emscripten is a cross-compiler, we should never look at the system-provided directories like /usr/include and so on.
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# Therefore only CMAKE_FIND_ROOT_PATH should be used as a find directory. See http://www.cmake.org/cmake/help/v3.0/variable/CMAKE_FIND_ROOT_PATH_MODE_INCLUDE.html
+ − 107
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
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set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+ − 109
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
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set(CMAKE_SYSTEM_INCLUDE_PATH "${EMSCRIPTEN_ROOT_PATH}/system/include")
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# We would prefer to specify a standard set of Clang+Emscripten-friendly common convention for suffix files, especially for CMake executable files,
+ − 114
# 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.
+ − 115
#SET(CMAKE_LINK_LIBRARY_SUFFIX "")
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#SET(CMAKE_STATIC_LIBRARY_PREFIX "")
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#SET(CMAKE_STATIC_LIBRARY_SUFFIX ".bc")
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#SET(CMAKE_SHARED_LIBRARY_PREFIX "")
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#SET(CMAKE_SHARED_LIBRARY_SUFFIX ".bc")
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SET(CMAKE_EXECUTABLE_SUFFIX ".js")
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#SET(CMAKE_FIND_LIBRARY_PREFIXES "")
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#SET(CMAKE_FIND_LIBRARY_SUFFIXES ".bc")
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+ − 124
SET(CMAKE_C_USE_RESPONSE_FILE_FOR_LIBRARIES 1)
+ − 125
SET(CMAKE_CXX_USE_RESPONSE_FILE_FOR_LIBRARIES 1)
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SET(CMAKE_C_USE_RESPONSE_FILE_FOR_OBJECTS 1)
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SET(CMAKE_CXX_USE_RESPONSE_FILE_FOR_OBJECTS 1)
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SET(CMAKE_C_USE_RESPONSE_FILE_FOR_INCLUDES 1)
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SET(CMAKE_CXX_USE_RESPONSE_FILE_FOR_INCLUDES 1)
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set(CMAKE_C_RESPONSE_FILE_LINK_FLAG "@")
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set(CMAKE_CXX_RESPONSE_FILE_LINK_FLAG "@")
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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_C_CREATE_STATIC_LIBRARY "<CMAKE_AR> rc <TARGET> <LINK_FLAGS> <OBJECTS>")
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set(CMAKE_CXX_CREATE_STATIC_LIBRARY "<CMAKE_AR> rc <TARGET> <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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set(EMSCRIPTEN 1 CACHE BOOL "If true, we are targeting Emscripten output.")
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# Hardwire support for cmake-2.8/Modules/CMakeBackwardsCompatibilityC.cmake without having CMake to try complex things
+ − 142
# to autodetect these:
+ − 143
set(CMAKE_SKIP_COMPATIBILITY_TESTS 1)
+ − 144
set(CMAKE_SIZEOF_CHAR 1)
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set(CMAKE_SIZEOF_UNSIGNED_SHORT 2)
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set(CMAKE_SIZEOF_SHORT 2)
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set(CMAKE_SIZEOF_INT 4)
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set(CMAKE_SIZEOF_UNSIGNED_LONG 4)
+ − 149
set(CMAKE_SIZEOF_UNSIGNED_INT 4)
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set(CMAKE_SIZEOF_LONG 4)
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set(CMAKE_SIZEOF_VOID_P 4)
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set(CMAKE_SIZEOF_FLOAT 4)
+ − 153
set(CMAKE_SIZEOF_DOUBLE 8)
+ − 154
set(CMAKE_C_SIZEOF_DATA_PTR 4)
+ − 155
set(CMAKE_CXX_SIZEOF_DATA_PTR 4)
+ − 156
set(CMAKE_HAVE_LIMITS_H 1)
+ − 157
set(CMAKE_HAVE_UNISTD_H 1)
+ − 158
set(CMAKE_HAVE_PTHREAD_H 1)
+ − 159
set(CMAKE_HAVE_SYS_PRCTL_H 1)
+ − 160
set(CMAKE_WORDS_BIGENDIAN 0)
+ − 161
set(CMAKE_DL_LIBS)
+ − 162
+ − 163
set(CMAKE_C_FLAGS_RELEASE "-DNDEBUG -O2" CACHE STRING "Emscripten-overridden CMAKE_C_FLAGS_RELEASE")
+ − 164
set(CMAKE_C_FLAGS_MINSIZEREL "-DNDEBUG -Os" CACHE STRING "Emscripten-overridden CMAKE_C_FLAGS_MINSIZEREL")
+ − 165
set(CMAKE_C_FLAGS_RELWITHDEBINFO "-O2" CACHE STRING "Emscripten-overridden CMAKE_C_FLAGS_RELWITHDEBINFO")
+ − 166
set(CMAKE_CXX_FLAGS_RELEASE "-DNDEBUG -O2" CACHE STRING "Emscripten-overridden CMAKE_CXX_FLAGS_RELEASE")
+ − 167
set(CMAKE_CXX_FLAGS_MINSIZEREL "-DNDEBUG -Os" CACHE STRING "Emscripten-overridden CMAKE_CXX_FLAGS_MINSIZEREL")
+ − 168
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2" CACHE STRING "Emscripten-overridden CMAKE_CXX_FLAGS_RELWITHDEBINFO")
+ − 169
+ − 170
set(CMAKE_EXE_LINKER_FLAGS_RELEASE "-O2" CACHE STRING "Emscripten-overridden CMAKE_EXE_LINKER_FLAGS_RELEASE")
+ − 171
set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "-Os" CACHE STRING "Emscripten-overridden CMAKE_EXE_LINKER_FLAGS_MINSIZEREL")
+ − 172
set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "-O2 -g" CACHE STRING "Emscripten-overridden CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO")
+ − 173
set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "-O2" CACHE STRING "Emscripten-overridden CMAKE_SHARED_LINKER_FLAGS_RELEASE")
+ − 174
set(CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL "-Os" CACHE STRING "Emscripten-overridden CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL")
+ − 175
set(CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "-O2 -g" CACHE STRING "Emscripten-overridden CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO")
+ − 176
set(CMAKE_MODULE_LINKER_FLAGS_RELEASE "-O2" CACHE STRING "Emscripten-overridden CMAKE_MODULE_LINKER_FLAGS_RELEASE")
+ − 177
set(CMAKE_MODULE_LINKER_FLAGS_MINSIZEREL "-Os" CACHE STRING "Emscripten-overridden CMAKE_MODULE_LINKER_FLAGS_MINSIZEREL")
+ − 178
set(CMAKE_MODULE_LINKER_FLAGS_RELWITHDEBINFO "-O2 -g" CACHE STRING "Emscripten-overridden CMAKE_MODULE_LINKER_FLAGS_RELWITHDEBINFO")
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+ − 180
function(em_validate_asmjs_after_build target)
+ − 181
add_custom_command(TARGET ${target} POST_BUILD COMMAND ${CMAKE_COMMAND} -E echo Validating build output for asm.js... COMMAND "python" ARGS "${EMSCRIPTEN_ROOT_PATH}/tools/validate_asmjs.py" "$<TARGET_FILE:${target}>")
+ − 182
endfunction()
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# A global counter to guarantee unique names for js library files.
+ − 185
set(link_js_counter 1)
+ − 186
+ − 187
# Internal function: Do not call from user CMakeLists.txt files. Use one of em_link_js_library()/em_link_pre_js()/em_link_post_js() instead.
+ − 188
function(em_add_tracked_link_flag target flagname)
+ − 189
+ − 190
# User can input list of JS files either as a single list, or as variable arguments to this function, so iterate over varargs, and treat each
+ − 191
# item in varargs as a list itself, to support both syntax forms.
+ − 192
foreach(jsFileList ${ARGN})
+ − 193
foreach(jsfile ${jsFileList})
+ − 194
# If the user edits the JS file, we want to relink the emscripten application, but unfortunately it is not possible to make a link step
+ − 195
# depend directly on a source file. Instead, we must make a dummy no-op build target on that source file, and make the project depend on
+ − 196
# that target.
+ − 197
+ − 198
# Sanitate the source .js filename to a good symbol name to use as a dummy filename.
+ − 199
get_filename_component(jsname "${jsfile}" NAME)
+ − 200
string(REGEX REPLACE "[/:\\\\.\ ]" "_" dummy_js_target ${jsname})
+ − 201
set(dummy_lib_name ${target}_${link_js_counter}_${dummy_js_target})
+ − 202
set(dummy_c_name "${CMAKE_BINARY_DIR}/${dummy_js_target}_tracker.c")
+ − 203
+ − 204
# Create a new static library target that with a single dummy .c file.
+ − 205
add_library(${dummy_lib_name} STATIC ${dummy_c_name})
+ − 206
# Make the dummy .c file depend on the .js file we are linking, so that if the .js file is edited, the dummy .c file, and hence the static library will be rebuild (no-op). This causes the main application to be relinked, which is what we want.
+ − 207
# This approach was recommended by http://www.cmake.org/pipermail/cmake/2010-May/037206.html
+ − 208
add_custom_command(OUTPUT ${dummy_c_name} COMMAND ${CMAKE_COMMAND} -E touch ${dummy_c_name} DEPENDS ${jsfile})
+ − 209
target_link_libraries(${target} ${dummy_lib_name})
+ − 210
+ − 211
# Link the js-library to the target
+ − 212
# When a linked library starts with a "-" cmake will just add it to the linker command line as it is.
+ − 213
# The advantage of doing it this way is that the js-library will also be automatically linked to targets
+ − 214
# that depend on this target.
+ − 215
get_filename_component(js_file_absolute_path "${jsfile}" ABSOLUTE )
+ − 216
target_link_libraries(${target} "${flagname} \"${js_file_absolute_path}\"")
+ − 217
+ − 218
math(EXPR link_js_counter "${link_js_counter} + 1")
+ − 219
endforeach()
+ − 220
endforeach()
+ − 221
endfunction()
+ − 222
+ − 223
# This function links a (list of ) .js library file(s) to the given CMake project.
+ − 224
# Example: em_link_js_library(my_executable "lib1.js" "lib2.js")
+ − 225
# will result in emcc passing --js-library lib1.js --js-library lib2.js to the emscripten linker, as well as
+ − 226
# tracking the modification timestamp between the linked .js files and the main project, so that editing the .js file
+ − 227
# will cause the target project to be relinked.
+ − 228
function(em_link_js_library target)
+ − 229
em_add_tracked_link_flag(${target} "--js-library" ${ARGN})
+ − 230
endfunction()
+ − 231
+ − 232
# This function is identical to em_link_js_library(), except the .js files will be added with '--pre-js file.js' command line flag,
+ − 233
# which is generally used to add some preamble .js code to a generated output file.
+ − 234
function(em_link_pre_js target)
+ − 235
em_add_tracked_link_flag(${target} "--pre-js" ${ARGN})
+ − 236
endfunction()
+ − 237
+ − 238
# This function is identical to em_link_js_library(), except the .js files will be added with '--post-js file.js' command line flag,
+ − 239
# which is generally used to add some postamble .js code to a generated output file.
+ − 240
function(em_link_post_js target)
+ − 241
em_add_tracked_link_flag(${target} "--post-js" ${ARGN})
+ − 242
endfunction()
+ − 243
+ − 244
# Experimental support for targeting generation of Visual Studio project files (vs-tool) of Emscripten projects for Windows.
+ − 245
# To use this, pass the combination -G "Visual Studio 10" -DCMAKE_TOOLCHAIN_FILE=Emscripten.cmake
+ − 246
if ("${CMAKE_GENERATOR}" MATCHES "^Visual Studio.*")
+ − 247
# By default, CMake generates VS project files with a <GenerateManifest>true</GenerateManifest> directive.
+ − 248
# This causes VS to attempt to invoke rc.exe during the build, which will fail since app manifests are meaningless for Emscripten.
+ − 249
# To disable this, add the following linker flag. This flag will not go to emcc, since the Visual Studio CMake generator will swallow it.
+ − 250
set(EMSCRIPTEN_VS_LINKER_FLAGS "/MANIFEST:NO")
+ − 251
# CMake is hardcoded to write a ClCompile directive <ObjectFileName>$(IntDir)</ObjectFileName> in all VS project files it generates.
+ − 252
# This makes VS pass emcc a -o param that points to a directory instead of a file, which causes emcc autogenerate the output filename.
+ − 253
# CMake is hardcoded to assume all object files have the suffix .obj, so adjust the emcc-autogenerated default suffix name to match.
+ − 254
set(EMSCRIPTEN_VS_LINKER_FLAGS "${EMSCRIPTEN_VS_LINKER_FLAGS} --default-obj-ext .obj")
+ − 255
# Also hint CMake that it should not hardcode <ObjectFileName> generation. Requires a custom CMake build for this to work (ignored on others)
+ − 256
# See http://www.cmake.org/Bug/view.php?id=14673 and https://github.com/juj/CMake
+ − 257
set(CMAKE_VS_NO_DEFAULT_OBJECTFILENAME 1)
+ − 258
+ − 259
# Apply and cache Emscripten Visual Studio IDE-specific linker flags.
+ − 260
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${EMSCRIPTEN_VS_LINKER_FLAGS}" CACHE STRING "")
+ − 261
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${EMSCRIPTEN_VS_LINKER_FLAGS}" CACHE STRING "")
+ − 262
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${EMSCRIPTEN_VS_LINKER_FLAGS}" CACHE STRING "")
+ − 263
endif()
+ − 264
+ − 265
if(NOT DEFINED CMAKE_CROSSCOMPILING_EMULATOR)
+ − 266
find_program(NODE_JS_EXECUTABLE NAMES nodejs node)
+ − 267
if(NODE_JS_EXECUTABLE)
+ − 268
set(CMAKE_CROSSCOMPILING_EMULATOR "${NODE_JS_EXECUTABLE}" CACHE FILEPATH "Path to the emulator for the target system.")
+ − 269
endif()
+ − 270
endif()
+ − 271
+ − 272
# No-op on CMAKE_CROSSCOMPILING_EMULATOR so older versions of cmake do not
+ − 273
# complain about unused CMake variable.
+ − 274
if(CMAKE_CROSSCOMPILING_EMULATOR)
+ − 275
endif()