if (NOT "${EMSCRIPTEN_TRAP_MODE}" STREQUAL "")
  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -s BINARYEN_TRAP_MODE='\"${EMSCRIPTEN_TRAP_MODE}\"'")
endif()

set(WASM_FLAGS "-s SIDE_MODULE=1 -s EXPORT_ALL=1")

if (EMSCRIPTEN_TARGET_MODE STREQUAL "wasm")
  # WebAssembly
  set(WASM_FLAGS "${WASM_FLAGS} -s WASM=1 -s FETCH=1")
  
elseif (EMSCRIPTEN_TARGET_MODE STREQUAL "asm.js")
  # asm.js targeting IE 11
  set(WASM_FLAGS "-s WASM=0 -s ASM_JS=2 -s FETCH=1 -s LEGACY_VM_SUPPORT=1")

else()
  message(FATAL_ERROR "Bad value for EMSCRIPTEN_TARGET_MODE: ${EMSCRIPTEN_TARGET_MODE}")
endif()

if (CMAKE_BUILD_TYPE STREQUAL "Debug")
  set(WASM_FLAGS "${WASM_FLAGS} -s SAFE_HEAP=1")
endif()

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WASM_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WASM_FLAGS}")