mirror of
https://github.com/godotengine/godot.git
synced 2024-12-09 10:09:20 +08:00
142 lines
4.9 KiB
Python
142 lines
4.9 KiB
Python
import os
|
|
import sys
|
|
|
|
|
|
def is_active():
|
|
return True
|
|
|
|
|
|
def get_name():
|
|
return 'JavaScript'
|
|
|
|
|
|
def can_build():
|
|
return 'EM_CONFIG' in os.environ or os.path.exists(os.path.expanduser('~/.emscripten'))
|
|
|
|
|
|
def get_opts():
|
|
from SCons.Variables import BoolVariable
|
|
return [
|
|
# eval() can be a security concern, so it can be disabled.
|
|
BoolVariable('javascript_eval', 'Enable JavaScript eval interface', True),
|
|
]
|
|
|
|
|
|
def get_flags():
|
|
return [
|
|
('tools', 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 configure(env):
|
|
|
|
## Build type
|
|
|
|
if env['target'] != 'debug':
|
|
# 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'])
|
|
if env['target'] == 'release_debug':
|
|
env.Append(CPPDEFINES=['DEBUG_ENABLED'])
|
|
# Retain function names for backtraces at the cost of file size.
|
|
env.Append(LINKFLAGS=['--profiling-funcs'])
|
|
else:
|
|
env.Append(CPPDEFINES=['DEBUG_ENABLED'])
|
|
env.Append(CCFLAGS=['-O1', '-g'])
|
|
env.Append(LINKFLAGS=['-O1', '-g'])
|
|
env.Append(LINKFLAGS=['-s', 'ASSERTIONS=1'])
|
|
|
|
## Compiler configuration
|
|
|
|
env['ENV'] = os.environ
|
|
|
|
em_config_file = os.getenv('EM_CONFIG') or os.path.expanduser('~/.emscripten')
|
|
if not os.path.exists(em_config_file):
|
|
raise RuntimeError("Emscripten configuration file '%s' does not exist" % em_config_file)
|
|
with open(em_config_file) as f:
|
|
em_config = {}
|
|
try:
|
|
# Emscripten configuration file is a Python file with simple assignments.
|
|
exec(f.read(), em_config)
|
|
except StandardError as e:
|
|
raise RuntimeError("Emscripten configuration file '%s' is invalid:\n%s" % (em_config_file, e))
|
|
if 'EMSCRIPTEN_ROOT' not in em_config:
|
|
raise RuntimeError("'EMSCRIPTEN_ROOT' missing in Emscripten configuration file '%s'" % em_config_file)
|
|
env.PrependENVPath('PATH', em_config['EMSCRIPTEN_ROOT'])
|
|
|
|
env['CC'] = 'emcc'
|
|
env['CXX'] = 'em++'
|
|
env['LINK'] = 'emcc'
|
|
|
|
# Emscripten's ar has issues with duplicate file names, so use cc.
|
|
env['AR'] = 'emcc'
|
|
env['ARFLAGS'] = '-o'
|
|
# emranlib is a noop, so it's safe to use with AR=emcc.
|
|
env['RANLIB'] = 'emranlib'
|
|
|
|
# Use TempFileMunge since some AR invocations are too long for cmd.exe.
|
|
# Use POSIX-style paths, required with TempFileMunge.
|
|
env['ARCOM_POSIX'] = env['ARCOM'].replace(
|
|
'$TARGET', '$TARGET.posix').replace(
|
|
'$SOURCES', '$SOURCES.posix')
|
|
env['ARCOM'] = '${TEMPFILE(ARCOM_POSIX)}'
|
|
|
|
# All intermediate files are just LLVM bitcode.
|
|
env['OBJPREFIX'] = ''
|
|
env['OBJSUFFIX'] = '.bc'
|
|
env['PROGPREFIX'] = ''
|
|
# Program() output consists of multiple files, so specify suffixes manually at builder.
|
|
env['PROGSUFFIX'] = ''
|
|
env['LIBPREFIX'] = 'lib'
|
|
env['LIBSUFFIX'] = '.bc'
|
|
env['LIBPREFIXES'] = ['$LIBPREFIX']
|
|
env['LIBSUFFIXES'] = ['$LIBSUFFIX']
|
|
|
|
## Compile flags
|
|
|
|
env.Append(CPPPATH=['#platform/javascript'])
|
|
env.Append(CPPDEFINES=['JAVASCRIPT_ENABLED', 'UNIX_ENABLED'])
|
|
|
|
# No multi-threading (SharedArrayBuffer) available yet,
|
|
# once feasible also consider memory buffer size issues.
|
|
env.Append(CPPDEFINES=['NO_THREADS'])
|
|
|
|
# These flags help keep the file size down.
|
|
env.Append(CCFLAGS=['-fno-exceptions', '-fno-rtti'])
|
|
# Don't use dynamic_cast, necessary with no-rtti.
|
|
env.Append(CPPDEFINES=['NO_SAFE_CAST'])
|
|
|
|
if env['javascript_eval']:
|
|
env.Append(CPPDEFINES=['JAVASCRIPT_EVAL_ENABLED'])
|
|
|
|
## Link flags
|
|
|
|
env.Append(LINKFLAGS=['-s', 'BINARYEN=1'])
|
|
|
|
# Allow increasing memory buffer size during runtime. This is efficient
|
|
# when using WebAssembly (in comparison to asm.js) and works well for
|
|
# us since we don't know requirements at compile-time.
|
|
env.Append(LINKFLAGS=['-s', 'ALLOW_MEMORY_GROWTH=1'])
|
|
|
|
# This setting just makes WebGL 2 APIs available, it does NOT disable WebGL 1.
|
|
env.Append(LINKFLAGS=['-s', 'USE_WEBGL2=1'])
|
|
|
|
env.Append(LINKFLAGS=['-s', 'INVOKE_RUN=0'])
|
|
|
|
# TODO: Reevaluate usage of this setting now that engine.js manages engine runtime.
|
|
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'
|