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 sys
  25 import argparse
  26
  27 def skip_warning(filename, message):
  28     ignores = {
  29             '': ['-Warray-bounds', '-Wmismatched-tags', 'gcc_gfc: -Wignored-attributes', '-Wchar-subscripts',
  30                 'string literal (potentially insecure): -Wformat-security', '-Wdeprecated-register',
  31                 '-Wvarargs', 'keyword is hidden by macro definition', "but the argument has type 'char *': -Wformat-pedantic",
  32                 '-Wnested-anon-types', 'qualifier in explicit instantiation of', 'attribute argument not supported: asm_fprintf',
  33                 'when in C++ mode, this behavior is deprecated', '-Wignored-attributes', '-Wgnu-zero-variadic-macro-arguments',
  34                 '-Wformat-security'],
  35             'insn-modes.c': ['-Wshift-count-overflow'],
  36             'insn-emit.c': ['-Wtautological-compare'],
  37             'insn-attrtab.c': ['-Wparentheses-equality'],
  38             'gimple-match.c': ['-Wunused-', '-Wtautological-compare'],
  39             'generic-match.c': ['-Wunused-', '-Wtautological-compare'],
  40             'i386.md': ['-Wparentheses-equality', '-Wtautological-compare'],
  41             'sse.md': ['-Wparentheses-equality', '-Wtautological-compare'],
  42             'genautomata.c': ['-Wstring-plus-int']
  43
  44     }
  45
  46     for name, ignores in ignores.items():
  47         for i in ignores:
  48             if name in filename and i in message:
  49                 return True
  50
  51     return False
  52
  53 parser = argparse.ArgumentParser()
  54 parser.add_argument('log', help = 'Log file with clang warnings')
  55 args = parser.parse_args()
  56
  57 lines = [l.strip() for l in open(args.log)]
  58 total = 0
  59 messages = []
  60 for l in lines:
  61     token = ': warning: '
  62     i = l.find(token)
  63     if i != -1:
  64         location = l[:i]
  65         message = l[i + len(token):]
  66         if not skip_warning(location, message):
  67             total += 1
  68             messages.append(l)
  69
  70 for l in sorted(messages):
  71     print(l)
  72 print('\nTotal warnings: %d' % total)