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99 lines
3.2 KiB
Python
99 lines
3.2 KiB
Python
# Copyright 2019 MongoDB Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import math
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import os
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import re
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import subprocess
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import SCons
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from pkg_resources import parse_version
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# This is the oldest version of ccache that offers support for -gsplit-dwarf
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_ccache_version_min = parse_version('3.2.3')
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_ccache_version_found = None
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def exists(env):
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"""Look for a viable ccache implementation that meets our version requirements."""
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# If we already generated, we definitely exist
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if 'CCACHE_VERSION' in env:
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return True
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ccache = env.get('CCACHE', False)
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if not ccache:
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return False
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ccache = env.WhereIs(ccache)
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if not ccache:
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return False
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pipe = SCons.Action._subproc(env,
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SCons.Util.CLVar(ccache) + ['--version'], stdin='devnull',
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stderr='devnull', stdout=subprocess.PIPE)
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if pipe.wait() != 0:
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return False
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validated = False
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for line in pipe.stdout:
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line = line.decode('utf-8')
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if validated:
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continue # consume all data
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version_banner = re.search(r'^ccache version', line)
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if not version_banner:
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continue
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ccache_version = re.split('ccache version (.+)', line)
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if len(ccache_version) < 2:
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continue
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global _ccache_version_found
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_ccache_version_found = parse_version(ccache_version[1])
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if _ccache_version_found >= _ccache_version_min:
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validated = True
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return validated
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def generate(env):
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"""Add ccache support."""
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# If we have already generated the tool, don't generate it again.
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if 'CCACHE_VERSION' in env:
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return
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# If we can't find ccache, or it is too old a version, don't
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# generate.
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if not exists(env):
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return
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# Record our found CCACHE_VERSION. Other tools that need to know
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# about ccache (like iecc) should query this variable to determine
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# if ccache is active. Looking at the CCACHE variable in the
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# environment is not sufficient, since the user may have set it,
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# but it doesn't work or is out of date.
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env['CCACHE_VERSION'] = _ccache_version_found
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# ccache does not support response files so force scons to always
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# use the full command
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#
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# Note: This only works for Python versions >= 3.5
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env['MAXLINELENGTH'] = math.inf
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# Add ccache to the relevant command lines. Wrap the reference to
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# ccache in the $( $) pattern so that turning ccache on or off
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# doesn't invalidate your build.
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env['CCCOM'] = '$( $CCACHE $)' + env['CCCOM']
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env['CXXCOM'] = '$( $CCACHE $)' + env['CXXCOM']
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env['SHCCCOM'] = '$( $CCACHE $)' + env['SHCCCOM']
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env['SHCXXCOM'] = '$( $CCACHE $)' + env['SHCXXCOM']
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