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#!/usr/bin/env python3
"""Helps to keep BUILD.gn files in sync with the corresponding CMakeLists.txt.
For each BUILD.gn file in the tree, checks if the list of cpp files in
it is identical to the list of cpp files in the corresponding CMakeLists.txt
file, and prints the difference if not.
Also checks that each CMakeLists.txt file below unittests/ folders that define
binaries have corresponding BUILD.gn files.
"""
from __future__ import print_function
import os
import re
import subprocess
import sys
def sync_source_lists():
# Use shell=True on Windows in case git is a bat file.
gn_files = subprocess.check_output(['git', 'ls-files', '*BUILD.gn'],
shell=os.name == 'nt').splitlines()
# Matches e.g. | "foo.cpp",|, captures |foo| in group 1.
gn_cpp_re = re.compile(r'^\s*"([^"]+\.(?:cpp|c|h|S))",$', re.MULTILINE)
# Matches e.g. | foo.cpp|, captures |foo| in group 1.
cmake_cpp_re = re.compile(r'^\s*([A-Za-z_0-9./-]+\.(?:cpp|c|h|S))$',
re.MULTILINE)
changed = False
for gn_file in gn_files:
# The CMakeLists.txt for llvm/utils/gn/secondary/foo/BUILD.gn is
# directly at foo/CMakeLists.txt.
strip_prefix = 'llvm/utils/gn/secondary/'
if not gn_file.startswith(strip_prefix):
continue
cmake_file = os.path.join(
os.path.dirname(gn_file[len(strip_prefix):]), 'CMakeLists.txt')
if not os.path.exists(cmake_file):
continue
def get_sources(source_re, text):
return set([m.group(1) for m in source_re.finditer(text)])
gn_cpp = get_sources(gn_cpp_re, open(gn_file).read())
cmake_cpp = get_sources(cmake_cpp_re, open(cmake_file).read())
if gn_cpp == cmake_cpp:
continue
changed = True
print(gn_file)
add = sorted(cmake_cpp - gn_cpp)
if add:
print('add:\n' + '\n'.join(' "%s",' % a for a in add))
remove = sorted(gn_cpp - cmake_cpp)
if remove:
print('remove:\n' + '\n'.join(remove))
print()
return changed
def sync_unittests():
# Matches e.g. |add_llvm_unittest_with_input_files|.
unittest_re = re.compile(r'^add_\S+_unittest', re.MULTILINE)
checked = [ 'clang', 'clang-tools-extra', 'lld', 'llvm' ]
changed = False
for c in checked:
for root, _, _ in os.walk(os.path.join(c, 'unittests')):
cmake_file = os.path.join(root, 'CMakeLists.txt')
if not os.path.exists(cmake_file):
continue
if not unittest_re.search(open(cmake_file).read()):
continue # Skip CMake files that just add subdirectories.
gn_file = os.path.join('llvm/utils/gn/secondary', root, 'BUILD.gn')
if not os.path.exists(gn_file):
changed = True
print('missing GN file %s for unittest CMake file %s' %
(gn_file, cmake_file))
return changed
def main():
src = sync_source_lists()
tests = sync_unittests()
if src or tests:
sys.exit(1)
if __name__ == '__main__':
main()
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