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#! /usr/bin/env python3
# Copyright 2020 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# Linker wrapper that performs distributed ThinLTO on Reclient.
#
# Usage: Pass the original link command as parameters to this script.
# E.g. original: clang++ -o foo foo.o
# Becomes: remote_ld clang++ -o foo foo.o
import os
import re
import sys
import remote_link
class RemoteLinkUnix(remote_link.RemoteLinkBase):
# Target-platform-specific constants.
WL = '-Wl,'
TLTO = '-plugin-opt=thinlto'
SEP = '='
DATA_SECTIONS = '-fdata-sections'
FUNCTION_SECTIONS = '-ffunction-sections'
GROUP_RE = re.compile(WL + '--(?:end|start)-group')
MACHINE_RE = re.compile('-m([0-9]+)')
OBJ_PATH = '-plugin-opt=obj-path' + SEP
OBJ_SUFFIX = '.o'
PREFIX_REPLACE = TLTO + '-prefix-replace' + SEP
XIR = '-x ir '
ALLOWLIST = {
'chrome',
}
def analyze_args(self, args, *posargs, **kwargs):
# TODO(crbug.com/40113922): Builds are unreliable when all targets use
# distributed ThinLTO, so we only enable it for some targets.
# For other targets, we fall back to local ThinLTO. We must use ThinLTO
# because we build with -fsplit-lto-unit, which requires code generation
# be done for each object and target.
# Returning None from this function causes the original, non-distributed
# linker command to be invoked.
if args.output is None:
return None
if not (args.allowlist or os.path.basename(args.output) in self.ALLOWLIST):
return None
return super(RemoteLinkUnix, self).analyze_args(args, *posargs, **kwargs)
def process_output_param(self, args, i):
"""
If args[i] is a parameter that specifies the output file,
returns (output_name, new_i). Else, returns (None, new_i).
"""
if args[i] == '-o':
return (os.path.normpath(args[i + 1]), i + 2)
else:
return (None, i + 1)
if __name__ == '__main__':
sys.exit(RemoteLinkUnix().main(sys.argv))
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