247 lines
8.4 KiB
Python
247 lines
8.4 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright (c) 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import json
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import os
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import subprocess
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import sys
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import re
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from optparse import OptionParser
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# This script runs pkg-config, optionally filtering out some results, and
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# returns the result.
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#
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# The result will be [ <includes>, <cflags>, <libs>, <lib_dirs>, <ldflags> ]
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# where each member is itself a list of strings.
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#
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# You can filter out matches using "-v <regexp>" where all results from
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# pkgconfig matching the given regular expression will be ignored. You can
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# specify more than one regular expression my specifying "-v" more than once.
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#
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# You can specify a sysroot using "-s <sysroot>" where sysroot is the absolute
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# system path to the sysroot used for compiling. This script will attempt to
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# generate correct paths for the sysroot.
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#
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# When using a sysroot, you must also specify the architecture via
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# "-a <arch>" where arch is either "x86" or "x64".
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#
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# CrOS systemroots place pkgconfig files at <systemroot>/usr/share/pkgconfig
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# and one of <systemroot>/usr/lib/pkgconfig or <systemroot>/usr/lib64/pkgconfig
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# depending on whether the systemroot is for a 32 or 64 bit architecture. They
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# specify the 'lib' or 'lib64' of the pkgconfig path by defining the
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# 'system_libdir' variable in the args.gn file. pkg_config.gni communicates this
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# variable to this script with the "--system_libdir <system_libdir>" flag. If no
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# flag is provided, then pkgconfig files are assumed to come from
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# <systemroot>/usr/lib/pkgconfig.
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#
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# Additionally, you can specify the option --atleast-version. This will skip
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# the normal outputting of a dictionary and instead print true or false,
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# depending on the return value of pkg-config for the given package.
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def SetConfigPath(options):
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"""Set the PKG_CONFIG_LIBDIR environment variable.
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This takes into account any sysroot and architecture specification from the
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options on the given command line.
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"""
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sysroot = options.sysroot
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assert sysroot
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# Compute the library path name based on the architecture.
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arch = options.arch
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if sysroot and not arch:
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print("You must specify an architecture via -a if using a sysroot.")
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sys.exit(1)
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libdir = sysroot + '/' + options.system_libdir + '/pkgconfig'
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libdir += ':' + sysroot + '/share/pkgconfig'
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os.environ['PKG_CONFIG_LIBDIR'] = libdir
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return libdir
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def GetPkgConfigPrefixToStrip(options, args):
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"""Returns the prefix from pkg-config where packages are installed.
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This returned prefix is the one that should be stripped from the beginning of
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directory names to take into account sysroots.
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"""
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# Some sysroots, like the Chromium OS ones, may generate paths that are not
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# relative to the sysroot. For example,
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# /path/to/chroot/build/x86-generic/usr/lib/pkgconfig/pkg.pc may have all
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# paths relative to /path/to/chroot (i.e. prefix=/build/x86-generic/usr)
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# instead of relative to /path/to/chroot/build/x86-generic (i.e prefix=/usr).
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# To support this correctly, it's necessary to extract the prefix to strip
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# from pkg-config's |prefix| variable.
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prefix = subprocess.check_output([options.pkg_config,
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"--variable=prefix"] + args, env=os.environ).decode('utf-8')
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return prefix
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def MatchesAnyRegexp(flag, list_of_regexps):
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"""Returns true if the first argument matches any regular expression in the
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given list."""
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for regexp in list_of_regexps:
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if regexp.search(flag) != None:
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return True
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return False
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def RewritePath(path, strip_prefix, sysroot):
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"""Rewrites a path by stripping the prefix and prepending the sysroot."""
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if os.path.isabs(path) and not path.startswith(sysroot):
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if path.startswith(strip_prefix):
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path = path[len(strip_prefix):]
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path = path.lstrip('/')
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return os.path.join(sysroot, path)
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else:
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return path
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def main():
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# If this is run on non-Linux platforms, just return nothing and indicate
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# success. This allows us to "kind of emulate" a Linux build from other
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# platforms.
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if "linux" not in sys.platform:
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print("[[],[],[],[],[]]")
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return 0
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parser = OptionParser()
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parser.add_option('-d', '--debug', action='store_true')
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parser.add_option('-p', action='store', dest='pkg_config', type='string',
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default='pkg-config')
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parser.add_option('-v', action='append', dest='strip_out', type='string')
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parser.add_option('-s', action='store', dest='sysroot', type='string')
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parser.add_option('-a', action='store', dest='arch', type='string')
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parser.add_option('--system_libdir', action='store', dest='system_libdir',
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type='string', default='lib')
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parser.add_option('--atleast-version', action='store',
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dest='atleast_version', type='string')
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parser.add_option('--libdir', action='store_true', dest='libdir')
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parser.add_option('--dridriverdir', action='store_true', dest='dridriverdir')
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parser.add_option('--version-as-components', action='store_true',
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dest='version_as_components')
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(options, args) = parser.parse_args()
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# Make a list of regular expressions to strip out.
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strip_out = []
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if options.strip_out != None:
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for regexp in options.strip_out:
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strip_out.append(re.compile(regexp))
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if options.sysroot:
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libdir = SetConfigPath(options)
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if options.debug:
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sys.stderr.write('PKG_CONFIG_LIBDIR=%s\n' % libdir)
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prefix = GetPkgConfigPrefixToStrip(options, args)
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else:
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prefix = ''
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if options.atleast_version:
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# When asking for the return value, just run pkg-config and print the return
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# value, no need to do other work.
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if not subprocess.call([options.pkg_config,
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"--atleast-version=" + options.atleast_version] +
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args):
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print("true")
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else:
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print("false")
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return 0
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if options.version_as_components:
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cmd = [options.pkg_config, "--modversion"] + args
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try:
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version_string = subprocess.check_output(cmd).decode('utf-8')
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except:
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sys.stderr.write('Error from pkg-config.\n')
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return 1
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print(json.dumps(list(map(int, version_string.strip().split(".")))))
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return 0
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if options.libdir:
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cmd = [options.pkg_config, "--variable=libdir"] + args
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if options.debug:
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sys.stderr.write('Running: %s\n' % cmd)
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try:
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libdir = subprocess.check_output(cmd).decode('utf-8')
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except:
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print("Error from pkg-config.")
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return 1
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sys.stdout.write(libdir.strip())
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return 0
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if options.dridriverdir:
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cmd = [options.pkg_config, "--variable=dridriverdir"] + args
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if options.debug:
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sys.stderr.write('Running: %s\n' % cmd)
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try:
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dridriverdir = subprocess.check_output(cmd).decode('utf-8')
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except:
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print("Error from pkg-config.")
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return 1
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sys.stdout.write(dridriverdir.strip())
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return
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cmd = [options.pkg_config, "--cflags", "--libs"] + args
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if options.debug:
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sys.stderr.write('Running: %s\n' % ' '.join(cmd))
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try:
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flag_string = subprocess.check_output(cmd).decode('utf-8')
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except:
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sys.stderr.write('Could not run pkg-config.\n')
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return 1
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# For now just split on spaces to get the args out. This will break if
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# pkgconfig returns quoted things with spaces in them, but that doesn't seem
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# to happen in practice.
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all_flags = flag_string.strip().split(' ')
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sysroot = options.sysroot
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if not sysroot:
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sysroot = ''
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includes = []
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cflags = []
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libs = []
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lib_dirs = []
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for flag in all_flags[:]:
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if len(flag) == 0 or MatchesAnyRegexp(flag, strip_out):
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continue;
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if flag[:2] == '-l':
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libs.append(RewritePath(flag[2:], prefix, sysroot))
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elif flag[:2] == '-L':
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lib_dirs.append(RewritePath(flag[2:], prefix, sysroot))
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elif flag[:2] == '-I':
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includes.append(RewritePath(flag[2:], prefix, sysroot))
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elif flag[:3] == '-Wl':
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# Don't allow libraries to control ld flags. These should be specified
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# only in build files.
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pass
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elif flag == '-pthread':
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# Many libs specify "-pthread" which we don't need since we always include
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# this anyway. Removing it here prevents a bunch of duplicate inclusions
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# on the command line.
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pass
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else:
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cflags.append(flag)
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# Output a GN array, the first one is the cflags, the second are the libs. The
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# JSON formatter prints GN compatible lists when everything is a list of
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# strings.
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print(json.dumps([includes, cflags, libs, lib_dirs]))
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return 0
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if __name__ == '__main__':
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sys.exit(main())
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