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# Copyright 2017 The Cobalt Authors. All Rights Reserved.
#
# 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.
"""Allows to use Clang (invoked as clang++) as a dynamic linker."""
from starboard.tools.toolchain import abstract
from starboard.tools.toolchain import common
class DynamicLinkerBase(object):
"""A base class for Clang based linking of executables and shared libraries.
Invoked as clang++.
"""
def __init__(self, **kwargs):
self._path = common.GetPath('clang++', **kwargs)
self._extra_flags = kwargs.get('extra_flags', [])
self._max_concurrent_processes = kwargs.get(
'max_concurrent_processes', common.EstimateMaxConcurrentLinkers())
def GetPath(self):
return self._path
def GetExtraFlags(self):
return self._extra_flags
def GetMaxConcurrentProcesses(self):
return self._max_concurrent_processes
def GetDescription(self):
return 'LINK $out'
def GetRspFilePath(self):
return '$out.rsp'
def GetRspFileContent(self):
return '$in_newline'
def GetFlags(self, ldflags):
return ldflags
class ExecutableLinker(DynamicLinkerBase, abstract.ExecutableLinker):
"""Links executables using Clang (invoked as clang++)."""
def __init__(self, **kwargs):
super(ExecutableLinker, self).__init__(**kwargs)
# Groups archives to be searched until all references are resolved.
self._write_group = kwargs.get('write_group', False)
def GetCommand(self, path, extra_flags, flags, shell):
del shell # Not used.
if self._write_group:
return ('{0} {1} {2} -Wl,--start-group @$rspfile -Wl,--end-group -o $out'
.format(path, extra_flags, flags))
else:
return '{0} {1} {2} @$rspfile -o $out'.format(path, extra_flags, flags)
class SharedLibraryLinker(DynamicLinkerBase, abstract.SharedLibraryLinker):
"""Links shared libraries using Clang (invoked as clang++)."""
def __init__(self, **kwargs):
super(SharedLibraryLinker, self).__init__(**kwargs)
def GetCommand(self, path, extra_flags, flags, shell):
del shell # Not used.
return ('{0} -shared {1} -o $out {2} -Wl,-soname=$soname '
'-Wl,--whole-archive @$rspfile -Wl,--no-whole-archive').format(
path, extra_flags, flags)