#!/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 andnot arch:
print("You must specify an architecture via -a if using a sysroot.")
sys.exit(1)
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: returnTrue returnFalse
def RewritePath(path, strip_prefix, sysroot): """Rewrites a path by stripping the prefix and prepending the sysroot.""" if os.path.isabs(path) andnot 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"notin sys.platform:
print("[[],[],[],[],[]]") return 0
# 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. ifnot subprocess.call([options.pkg_config, "--atleast-version=" + options.atleast_version] +
args):
print("true") else:
print("false") return 0
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(' ')
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
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.