diff options
Diffstat (limited to 'third_party/libwebrtc/build/config/linux/pkg-config.py')
| -rwxr-xr-x | third_party/libwebrtc/build/config/linux/pkg-config.py | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/third_party/libwebrtc/build/config/linux/pkg-config.py b/third_party/libwebrtc/build/config/linux/pkg-config.py new file mode 100755 index 0000000000..5adf70cc3b --- /dev/null +++ b/third_party/libwebrtc/build/config/linux/pkg-config.py @@ -0,0 +1,248 @@ +#!/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()) |