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#!/usr/bin/env python
# Copyright (c) 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
from __future__ import print_function
import json
import os
import subprocess
import sys
import re
from optparse import OptionParser
# This script runs pkg-config, optionally filtering out some results, and
# returns the result.
#
# The result will be [ <includes>, <cflags>, <libs>, <lib_dirs>, <ldflags> ]
# where each member is itself a list of strings.
#
# You can filter out matches using "-v <regexp>" where all results from
# pkgconfig matching the given regular expression will be ignored. You can
# specify more than one regular expression my specifying "-v" more than once.
#
# You can specify a sysroot using "-s <sysroot>" where sysroot is the absolute
# system path to the sysroot used for compiling. This script will attempt to
# generate correct paths for the sysroot.
#
# When using a sysroot, you must also specify the architecture via
# "-a <arch>" where arch is either "x86" or "x64".
#
# CrOS systemroots place pkgconfig files at <systemroot>/usr/share/pkgconfig
# and one of <systemroot>/usr/lib/pkgconfig or <systemroot>/usr/lib64/pkgconfig
# depending on whether the systemroot is for a 32 or 64 bit architecture. They
# specify the 'lib' or 'lib64' of the pkgconfig path by defining the
# 'system_libdir' variable in the args.gn file. pkg_config.gni communicates this
# variable to this script with the "--system_libdir <system_libdir>" flag. If no
# flag is provided, then pkgconfig files are assumed to come from
# <systemroot>/usr/lib/pkgconfig.
#
# Additionally, you can specify the option --atleast-version. This will skip
# the normal outputting of a dictionary and instead print true or false,
# depending on the return value of pkg-config for the given package.
def SetConfigPath(options):
"""Set the PKG_CONFIG_LIBDIR environment variable.
This takes into account any sysroot and architecture specification from the
options on the given command line.
"""
sysroot = options.sysroot
assert sysroot
# Compute the library path name based on the architecture.
arch = options.arch
if sysroot and not arch:
print("You must specify an architecture via -a if using a sysroot.")
sys.exit(1)
libdir = sysroot + '/usr/' + options.system_libdir + '/pkgconfig'
libdir += ':' + sysroot + '/usr/share/pkgconfig'
os.environ['PKG_CONFIG_LIBDIR'] = libdir
return libdir
def GetPkgConfigPrefixToStrip(options, args):
"""Returns the prefix from pkg-config where packages are installed.
This returned prefix is the one that should be stripped from the beginning of
directory names to take into account sysroots.
"""
# Some sysroots, like the Chromium OS ones, may generate paths that are not
# relative to the sysroot. For example,
# /path/to/chroot/build/x86-generic/usr/lib/pkgconfig/pkg.pc may have all
# paths relative to /path/to/chroot (i.e. prefix=/build/x86-generic/usr)
# instead of relative to /path/to/chroot/build/x86-generic (i.e prefix=/usr).
# To support this correctly, it's necessary to extract the prefix to strip
# from pkg-config's |prefix| variable.
prefix = subprocess.check_output([options.pkg_config,
"--variable=prefix"] + args, env=os.environ).decode('utf-8')
if prefix[-4] == '/usr':
return prefix[4:]
return prefix
def MatchesAnyRegexp(flag, list_of_regexps):
"""Returns true if the first argument matches any regular expression in the
given list."""
for regexp in list_of_regexps:
if regexp.search(flag) != None:
return True
return False
def RewritePath(path, strip_prefix, sysroot):
"""Rewrites a path by stripping the prefix and prepending the sysroot."""
if os.path.isabs(path) and not path.startswith(sysroot):
if path.startswith(strip_prefix):
path = path[len(strip_prefix):]
path = path.lstrip('/')
return os.path.join(sysroot, path)
else:
return path
def main():
# If this is run on non-Linux platforms, just return nothing and indicate
# success. This allows us to "kind of emulate" a Linux build from other
# platforms.
if "linux" not in sys.platform:
print("[[],[],[],[],[]]")
return 0
parser = OptionParser()
parser.add_option('-d', '--debug', action='store_true')
parser.add_option('-p', action='store', dest='pkg_config', type='string',
default='pkg-config')
parser.add_option('-v', action='append', dest='strip_out', type='string')
parser.add_option('-s', action='store', dest='sysroot', type='string')
parser.add_option('-a', action='store', dest='arch', type='string')
parser.add_option('--system_libdir', action='store', dest='system_libdir',
type='string', default='lib')
parser.add_option('--atleast-version', action='store',
dest='atleast_version', type='string')
parser.add_option('--libdir', action='store_true', dest='libdir')
parser.add_option('--dridriverdir', action='store_true', dest='dridriverdir')
parser.add_option('--version-as-components', action='store_true',
dest='version_as_components')
(options, args) = parser.parse_args()
# Make a list of regular expressions to strip out.
strip_out = []
if options.strip_out != None:
for regexp in options.strip_out:
strip_out.append(re.compile(regexp))
if options.sysroot:
libdir = SetConfigPath(options)
if options.debug:
sys.stderr.write('PKG_CONFIG_LIBDIR=%s\n' % libdir)
prefix = GetPkgConfigPrefixToStrip(options, args)
else:
prefix = ''
if options.atleast_version:
# When asking for the return value, just run pkg-config and print the return
# value, no need to do other work.
if not subprocess.call([options.pkg_config,
"--atleast-version=" + options.atleast_version] +
args):
print("true")
else:
print("false")
return 0
if options.version_as_components:
cmd = [options.pkg_config, "--modversion"] + args
try:
version_string = subprocess.check_output(cmd).decode('utf-8')
except:
sys.stderr.write('Error from pkg-config.\n')
return 1
print(json.dumps(list(map(int, version_string.strip().split(".")))))
return 0
if options.libdir:
cmd = [options.pkg_config, "--variable=libdir"] + args
if options.debug:
sys.stderr.write('Running: %s\n' % cmd)
try:
libdir = subprocess.check_output(cmd).decode('utf-8')
except:
print("Error from pkg-config.")
return 1
sys.stdout.write(libdir.strip())
return 0
if options.dridriverdir:
cmd = [options.pkg_config, "--variable=dridriverdir"] + args
if options.debug:
sys.stderr.write('Running: %s\n' % cmd)
try:
dridriverdir = subprocess.check_output(cmd).decode('utf-8')
except:
print("Error from pkg-config.")
return 1
sys.stdout.write(dridriverdir.strip())
return
cmd = [options.pkg_config, "--cflags", "--libs"] + args
if options.debug:
sys.stderr.write('Running: %s\n' % ' '.join(cmd))
try:
flag_string = subprocess.check_output(cmd).decode('utf-8')
except:
sys.stderr.write('Could not run pkg-config.\n')
return 1
# For now just split on spaces to get the args out. This will break if
# pkgconfig returns quoted things with spaces in them, but that doesn't seem
# to happen in practice.
all_flags = flag_string.strip().split(' ')
sysroot = options.sysroot
if not sysroot:
sysroot = ''
includes = []
cflags = []
libs = []
lib_dirs = []
for flag in all_flags[:]:
if len(flag) == 0 or MatchesAnyRegexp(flag, strip_out):
continue;
if flag[:2] == '-l':
libs.append(RewritePath(flag[2:], prefix, sysroot))
elif flag[:2] == '-L':
lib_dirs.append(RewritePath(flag[2:], prefix, sysroot))
elif flag[:2] == '-I':
includes.append(RewritePath(flag[2:], prefix, sysroot))
elif flag[:3] == '-Wl':
# Don't allow libraries to control ld flags. These should be specified
# only in build files.
pass
elif flag == '-pthread':
# Many libs specify "-pthread" which we don't need since we always include
# this anyway. Removing it here prevents a bunch of duplicate inclusions
# on the command line.
pass
else:
cflags.append(flag)
# Output a GN array, the first one is the cflags, the second are the libs. The
# JSON formatter prints GN compatible lists when everything is a list of
# strings.
print(json.dumps([includes, cflags, libs, lib_dirs]))
return 0
if __name__ == '__main__':
sys.exit(main())
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