contrib/filter-clang-warnings.py

   1 #!/usr/bin/env python3
   2 #
   3 # Script to analyze warnings produced by clang.
   4 #
   5 # This file is part of GCC.
   6 #
   7 # GCC is free software; you can redistribute it and/or modify it under
   8 # the terms of the GNU General Public License as published by the Free
   9 # Software Foundation; either version 3, or (at your option) any later
  10 # version.
  11 #
  12 # GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 # WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 # for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with GCC; see the file COPYING3.  If not see
  19 # <http://www.gnu.org/licenses/>.  */
  20 #
  21 #
  22 #
  23
  24 import argparse
  25
  26
  27 def skip_warning(filename, message):
  28     ignores = {
  29             '': ['-Warray-bounds', '-Wmismatched-tags',
  30                  'gcc_gfc: -Wignored-attributes', '-Wchar-subscripts',
  31                  'string literal (potentially insecure): -Wformat-security',
  32                  '-Wdeprecated-register',
  33                  '-Wvarargs', 'keyword is hidden by macro definition',
  34                  "but the argument has type 'char *': -Wformat-pedantic",
  35                  '-Wnested-anon-types',
  36                  'qualifier in explicit instantiation of',
  37                  'attribute argument not supported: asm_fprintf',
  38                  'when in C++ mode, this behavior is deprecated',
  39                  '-Wignored-attributes', '-Wgnu-zero-variadic-macro-arguments',
  40                  '-Wformat-security', '-Wundefined-internal',
  41                  '-Wunknown-warning-option', '-Wc++20-extensions',
  42                  '-Wbitwise-instead-of-logical'],
  43             'insn-modes.cc': ['-Wshift-count-overflow'],
  44             'insn-emit.cc': ['-Wtautological-compare'],
  45             'insn-attrtab.cc': ['-Wparentheses-equality'],
  46             'gimple-match.cc': ['-Wunused-', '-Wtautological-compare'],
  47             'generic-match.cc': ['-Wunused-', '-Wtautological-compare'],
  48             'i386.md': ['-Wparentheses-equality', '-Wtautological-compare',
  49                         '-Wtautological-overlap-compare'],
  50             'sse.md': ['-Wparentheses-equality', '-Wtautological-compare',
  51                        '-Wconstant-logical-operand'],
  52             'mmx.md': ['-Wtautological-compare'],
  53             'genautomata.cc': ['-Wstring-plus-int'],
  54             'fold-const-call.cc': ['-Wreturn-type'],
  55             'gfortran.texi': [''],
  56             'libtool': [''],
  57             'lex.cc': ['-Wc++20-attribute-extensions'],
  58     }
  59
  60     for name, ignores in ignores.items():
  61         for i in ignores:
  62             if name in filename and i in message:
  63                 return True
  64     return False
  65
  66
  67 parser = argparse.ArgumentParser()
  68 parser.add_argument('log', help='Log file with clang warnings')
  69 args = parser.parse_args()
  70
  71 lines = [line.strip() for line in open(args.log)]
  72 total = 0
  73 messages = []
  74 for line in lines:
  75     token = ': warning: '
  76     i = line.find(token)
  77     if i != -1:
  78         location = line[:i]
  79         message = line[i + len(token):]
  80         if not skip_warning(location, message):
  81             total += 1
  82             messages.append(line)
  83
  84 for line in sorted(messages):
  85     print(line)
  86 print('\nTotal warnings: %d' % total)