1  #!/usr/bin/env python3
       2  
       3  # Copyright (C) 2018-2023 Free Software Foundation, Inc.
       4  #
       5  # Script to analyze warnings produced by clang.
       6  #
       7  # This file is part of GCC.
       8  #
       9  # GCC is free software; you can redistribute it and/or modify it under
      10  # the terms of the GNU General Public License as published by the Free
      11  # Software Foundation; either version 3, or (at your option) any later
      12  # version.
      13  #
      14  # GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      15  # WARRANTY; without even the implied warranty of MERCHANTABILITY or
      16  # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      17  # for more details.
      18  #
      19  # You should have received a copy of the GNU General Public License
      20  # along with GCC; see the file COPYING3.  If not see
      21  # <http://www.gnu.org/licenses/>.  */
      22  #
      23  #
      24  #
      25  
      26  import argparse
      27  
      28  
      29  def skip_warning(filename, message):
      30      ignores = {
      31              '': ['-Warray-bounds', '-Wmismatched-tags',
      32                   'gcc_gfc: -Wignored-attributes', '-Wchar-subscripts',
      33                   'string literal (potentially insecure): -Wformat-security',
      34                   '-Wdeprecated-register',
      35                   '-Wvarargs', 'keyword is hidden by macro definition',
      36                   "but the argument has type 'char *': -Wformat-pedantic",
      37                   '-Wnested-anon-types',
      38                   'qualifier in explicit instantiation of',
      39                   'attribute argument not supported: asm_fprintf',
      40                   'when in C++ mode, this behavior is deprecated',
      41                   '-Wignored-attributes', '-Wgnu-zero-variadic-macro-arguments',
      42                   '-Wformat-security', '-Wundefined-internal',
      43                   '-Wunknown-warning-option', '-Wc++20-extensions',
      44                   '-Wbitwise-instead-of-logical', 'egrep is obsolescent'],
      45              'insn-modes.cc': ['-Wshift-count-overflow'],
      46              'insn-emit.cc': ['-Wtautological-compare'],
      47              'insn-attrtab.cc': ['-Wparentheses-equality'],
      48              'gimple-match.cc': ['-Wunused-', '-Wtautological-compare'],
      49              'generic-match.cc': ['-Wunused-', '-Wtautological-compare'],
      50              'i386.md': ['-Wparentheses-equality', '-Wtautological-compare',
      51                          '-Wtautological-overlap-compare'],
      52              'sse.md': ['-Wparentheses-equality', '-Wtautological-compare',
      53                         '-Wconstant-logical-operand'],
      54              'mmx.md': ['-Wtautological-compare'],
      55              'genautomata.cc': ['-Wstring-plus-int'],
      56              'fold-const-call.cc': ['-Wreturn-type'],
      57              'gfortran.texi': [''],
      58              'libtool': [''],
      59              'lex.cc': ['-Wc++20-attribute-extensions'],
      60      }
      61  
      62      for name, ignore in ignores.items():
      63          for i in ignore:
      64              if name in filename and i in message:
      65                  return True
      66      return False
      67  
      68  
      69  parser = argparse.ArgumentParser()
      70  parser.add_argument('log', help='Log file with clang warnings')
      71  args = parser.parse_args()
      72  
      73  lines = [line.strip() for line in open(args.log)]
      74  messages = set()
      75  for line in lines:
      76      token = ': warning: '
      77      i = line.find(token)
      78      if i != -1:
      79          location = line[:i]
      80          message = line[i + len(token):]
      81          if '/libffi/' in location or location.startswith('Makefile'):
      82              continue
      83          if not skip_warning(location, message):
      84              messages.add(line)
      85  
      86  for line in sorted(messages):
      87      print(line)
      88  
      89  print('\nTotal warnings: %d' % len(messages))