import os import string import sys def is_active(): return True def get_name(): return "JavaScript" def can_build(): return ("EMSCRIPTEN_ROOT" in os.environ or "EMSCRIPTEN" in os.environ) def get_opts(): from SCons.Variables import BoolVariable return [ BoolVariable('javascript_eval', 'Enable JavaScript eval interface', True), ] def get_flags(): return [ ('tools', False), ('module_theora_enabled', False), # Disabling the mbedtls module reduces file size. # The module has little use due to the limited networking functionality # in this platform. For the available networking methods, the browser # manages TLS. ('module_mbedtls_enabled', False), ] def create(env): # remove Windows' .exe suffix return env.Clone(tools=['textfile', 'zip'], PROGSUFFIX='') def escape_sources_backslashes(target, source, env, for_signature): return [path.replace('\\','\\\\') for path in env.GetBuildPath(source)] def escape_target_backslashes(target, source, env, for_signature): return env.GetBuildPath(target[0]).replace('\\','\\\\') def configure(env): ## Build type if (env["target"] == "release"): # Use -Os to prioritize optimizing for reduced file size. This is # particularly valuable for the web platform because it directly # decreases download time. # -Os reduces file size by around 5 MiB over -O3. -Oz only saves about # 100 KiB over -Os, which does not justify the negative impact on # run-time performance. env.Append(CCFLAGS=['-Os']) env.Append(LINKFLAGS=['-Os']) elif (env["target"] == "release_debug"): env.Append(CCFLAGS=['-O2', '-DDEBUG_ENABLED']) env.Append(LINKFLAGS=['-O2', '-s', 'ASSERTIONS=1']) # retain function names at the cost of file size, for backtraces and profiling env.Append(LINKFLAGS=['--profiling-funcs']) elif (env["target"] == "debug"): env.Append(CCFLAGS=['-O1', '-D_DEBUG', '-g', '-DDEBUG_ENABLED']) env.Append(LINKFLAGS=['-O1', '-g']) ## Compiler configuration env['ENV'] = os.environ if ("EMSCRIPTEN_ROOT" in os.environ): env.PrependENVPath('PATH', os.environ['EMSCRIPTEN_ROOT']) elif ("EMSCRIPTEN" in os.environ): env.PrependENVPath('PATH', os.environ['EMSCRIPTEN']) env['CC'] = 'emcc' env['CXX'] = 'em++' env['LINK'] = 'emcc' env['RANLIB'] = 'emranlib' # Emscripten's ar has issues with duplicate file names, so use cc env['AR'] = 'emcc' env['ARFLAGS'] = '-o' if (os.name == 'nt'): # use TempFileMunge on Windows since some commands get too long for # cmd.exe even with spawn_fix # need to escape backslashes for this env['ESCAPED_SOURCES'] = escape_sources_backslashes env['ESCAPED_TARGET'] = escape_target_backslashes env['ARCOM'] = '${TEMPFILE("%s")}' % env['ARCOM'].replace('$SOURCES', '$ESCAPED_SOURCES').replace('$TARGET', '$ESCAPED_TARGET') env['OBJSUFFIX'] = '.bc' env['LIBSUFFIX'] = '.bc' ## Compile flags env.Append(CPPPATH=['#platform/javascript']) env.Append(CPPFLAGS=['-DJAVASCRIPT_ENABLED', '-DUNIX_ENABLED', '-DPTHREAD_NO_RENAME', '-DTYPED_METHOD_BIND', '-DNO_THREADS']) env.Append(CPPFLAGS=['-DGLES3_ENABLED']) # These flags help keep the file size down env.Append(CPPFLAGS=["-fno-exceptions", '-DNO_SAFE_CAST', '-fno-rtti']) if env['javascript_eval']: env.Append(CPPFLAGS=['-DJAVASCRIPT_EVAL_ENABLED']) ## Link flags env.Append(LINKFLAGS=['-s', 'BINARYEN=1']) env.Append(LINKFLAGS=['-s', 'ALLOW_MEMORY_GROWTH=1']) env.Append(LINKFLAGS=['-s', 'USE_WEBGL2=1']) env.Append(LINKFLAGS=['-s', 'EXTRA_EXPORTED_RUNTIME_METHODS="[\'FS\']"']) env.Append(LINKFLAGS=['-s', 'INVOKE_RUN=0']) env.Append(LINKFLAGS=['-s', 'NO_EXIT_RUNTIME=1']) # TODO: Move that to opus module's config if 'module_opus_enabled' in env and env['module_opus_enabled']: env.opus_fixed_point = "yes"