blob: f1074ed348a2f34b0c4e362fdbcafa0bcfb6b968 [file] [log] [blame]
#!/usr/bin/env python2.7
# Copyright 2019 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# This script prints out a summary of the differences between the GN and ZN builds on the topic of
# C/C++ compilation. The data is extracted by identifying in each build a target considered
# representative of the compilation environment in that build.
# This is meant to be a temporary tool as the build unification work proceeds. Once fuchsia.git
# builds with a single GN/ninja pass, the script can be deleted.
import argparse
import json
import os
import subprocess
import sys
SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
FUCHSIA_ROOT = os.path.dirname( # $root
os.path.dirname( # scripts
SCRIPT_DIR)) # unification
GN_TARGET = '//src/lib/fxl:fxl_logging(//build/toolchain/fuchsia:arm64-shared)'
ZN_TARGET = '//system/ulib/fdio:fdio.shared(//public/gn/toolchain:user-arm64-clang.shlib)'
def diff_lists(gn_object, zn_object, dimension):
print('Parameter [' + dimension + ']')
gn_set = set(gn_object[dimension])
zn_set = set(zn_object[dimension])
gn_only = gn_set - zn_set
zn_only = zn_set - gn_set
if not gn_only and not zn_only:
if gn_only:
print('GN only:')
for item in sorted(gn_only):
print(' ' + item)
if zn_only:
print('ZN only:')
for item in sorted(zn_only):
print(' ' + item)
def main():
parser = argparse.ArgumentParser(
description='Compares C/C++ compilation flags between the GN and ZN builds')
help='Path to the GN build dir',
args = parser.parse_args()
source_dir = FUCHSIA_ROOT
gn_build_dir = os.path.abspath(args.build_dir)
zn_build_dir = gn_build_dir + '.zircon'
if sys.platform.startswith('linux'):
platform = 'linux-x64'
elif sys.platform.startswith('darwin'):
platform = 'mac-x64'
print('Unsupported platform: %s' % sys.platform)
return 1
gn_binary = os.path.join(source_dir, 'prebuilt', 'third_party', 'gn',
platform, 'gn')
base_command = [gn_binary, 'desc', '--format=json']
print('Getting GN data... [' + GN_TARGET + ']')
gn_command = base_command + [gn_build_dir, GN_TARGET]
result = subprocess.check_output(gn_command, cwd=source_dir)
gn_data = json.loads(result)
print('Getting ZN data... [' + ZN_TARGET + ']')
zircon_dir = os.path.join(source_dir, 'zircon')
zn_command = base_command + ['--root=' + zircon_dir, zn_build_dir, ZN_TARGET]
result = subprocess.check_output(zn_command, cwd=source_dir)
zn_data = json.loads(result)
gn_object = gn_data.items()[0][1];
zn_object = zn_data.items()[0][1];
diff_lists(gn_object, zn_object, 'cflags');
diff_lists(gn_object, zn_object, 'cflags_c');
diff_lists(gn_object, zn_object, 'cflags_cc');
return 0
if __name__ == '__main__':