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# Copyright 2019 The meson development team
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Provides a mixin for shared code between C and C++ Emscripten compilers."""
import os.path
import typing as T
from ... import coredata
from ...mesonlib import MesonException
if T.TYPE_CHECKING:
from ..environment import Environment
class EmscriptenMixin:
def get_option_link_args(self, options):
return []
def get_soname_args(self, *args, **kwargs):
raise MesonException('Emscripten does not support shared libraries.')
def get_allow_undefined_link_args(self) -> T.List[str]:
return ['-s', 'ERROR_ON_UNDEFINED_SYMBOLS=0']
def get_linker_output_args(self, output: str) -> T.List[str]:
return ['-o', output]
def _get_compile_output(self, dirname, mode):
# In pre-processor mode, the output is sent to stdout and discarded
if mode == 'preprocess':
return None
# Unlike sane toolchains, emcc infers the kind of output from its name.
# This is the only reason why this method is overridden; compiler tests
# do not work well with the default exe/obj suffices.
if mode == 'link':
suffix = 'js'
else:
suffix = 'wasm'
return os.path.join(dirname, 'output.' + suffix)
def thread_flags(self, env: 'Environment') -> T.List[str]:
return ['-s', 'USE_PTHREADS=1']
def thread_link_flags(self, env: 'Environment') -> T.List[str]:
args = ['-s', 'USE_PTHREADS=1']
count = env.coredata.compiler_options[self.for_machine]['{}_thread_count'.format(self.language)].value # type: int
if count:
args.extend(['-s', 'PTHREAD_POOL_SIZE={}'.format(count)])
return args
def get_options(self):
opts = super().get_options()
opts.update({
'{}_thread_count'.format(self.language): coredata.UserIntegerOption(
'Number of threads to use in web assembly, set to 0 to disable',
(0, None, 4), # Default was picked at random
),
})
return opts
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