| # 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. |
| |
| 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". |
| # |
| # 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. |
| |
| # 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 sys.platform.find("linux") == -1: |
| print "[[],[],[],[],[]]" |
| sys.exit(0) |
| |
| |
| def SetConfigPath(options): |
| """Set the PKG_CONFIG_PATH environment variable. |
| This takes into account any sysroot and architecture specification from the |
| options on the given command line.""" |
| |
| sysroot = options.sysroot |
| if not sysroot: |
| 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) |
| if arch == 'x64': |
| libpath = 'lib64' |
| else: |
| libpath = 'lib' |
| |
| # Add the sysroot path to the environment's PKG_CONFIG_PATH |
| config_path = sysroot + '/usr/' + libpath + '/pkgconfig' |
| config_path += ':' + sysroot + '/usr/share/pkgconfig' |
| if 'PKG_CONFIG_PATH' in os.environ: |
| os.environ['PKG_CONFIG_PATH'] += ':' + config_path |
| else: |
| os.environ['PKG_CONFIG_PATH'] = config_path |
| |
| |
| def GetPkgConfigPrefixToStrip(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(["pkg-config", "--variable=prefix"] + args, |
| env=os.environ) |
| 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 |
| |
| |
| parser = OptionParser() |
| 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('--atleast-version', action='store', |
| dest='atleast_version', type='string') |
| parser.add_option('--libdir', action='store_true', dest='libdir') |
| (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)) |
| |
| SetConfigPath(options) |
| if options.sysroot: |
| prefix = GetPkgConfigPrefixToStrip(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, |
| env=os.environ): |
| print "true" |
| else: |
| print "false" |
| sys.exit(0) |
| |
| if options.libdir: |
| try: |
| libdir = subprocess.check_output([options.pkg_config, |
| "--variable=libdir"] + |
| args, |
| env=os.environ) |
| except: |
| print "Error from pkg-config." |
| sys.exit(1) |
| sys.stdout.write(libdir.strip()) |
| sys.exit(0) |
| |
| try: |
| flag_string = subprocess.check_output( |
| [ options.pkg_config, "--cflags", "--libs-only-l", "--libs-only-L" ] + |
| args, env=os.environ) |
| # 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(' ') |
| except: |
| print "Could not run pkg-config." |
| sys.exit(1) |
| |
| |
| sysroot = options.sysroot |
| if not sysroot: |
| sysroot = '' |
| |
| includes = [] |
| cflags = [] |
| libs = [] |
| lib_dirs = [] |
| ldflags = [] |
| |
| 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': |
| ldflags.append(flag) |
| 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, ldflags]) |