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Add comments to Emscripten flags

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This commit is contained in:
Alex Beregszaszi 2017-07-18 21:57:47 +01:00
parent 01fbc63623
commit 5050164d9e
1 changed files with 20 additions and 4 deletions
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24
cmake/EthCompilerSettings.cmake
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@ -160,10 +160,26 @@ if (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MA
endif()
if (EMSCRIPTEN)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --memory-init-file 0 -O3 -s LINKABLE=1 -s DISABLE_EXCEPTION_CATCHING=0 -s NO_EXIT_RUNTIME=1 -s ALLOW_MEMORY_GROWTH=1 -s NO_DYNAMIC_EXECUTION=1")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdata-sections -ffunction-sections -Wl,--gc-sections")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_FILESYSTEM=1 -s AGGRESSIVE_VARIABLE_ELIMINATION=1")
# Do emit a separate memory initialiser file
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --memory-init-file 0")
# Leave only exported symbols as public and agressively remove others
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdata-sections -ffunction-sections -Wl,--gc-sections -fvisibility=hidden")
# Optimisation level
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3")
# Keep every public symbols (disables dead code elimination)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s LINKABLE=1")
# Re-enable exception catching (optimisations above -O1 disable it)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s DISABLE_EXCEPTION_CATCHING=0")
# Remove any code related to exit (such as atexit)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_EXIT_RUNTIME=1")
# Remove any code related to filesystem access
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_FILESYSTEM=1")
# Remove variables even if it needs to be duplicated (can improve speed at the cost of size)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s AGGRESSIVE_VARIABLE_ELIMINATION=1")
# Allow memory growth, but disable some optimisations
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s ALLOW_MEMORY_GROWTH=1")
# Disable eval()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s NO_DYNAMIC_EXECUTION=1")
add_definitions(-DETH_EMSCRIPTEN=1)
endif()
endif()