contrib/filter-clang-warnings.py

   1 #!/usr/bin/env python3
   2
   3 # Copyright (C) 2018-2024 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))