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
24import argparse
25
26
27def 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
67parser = argparse.ArgumentParser()
68parser.add_argument('log', help='Log file with clang warnings')
69args = parser.parse_args()
70
71lines = [line.strip() for line in open(args.log)]
72total = 0
73messages = []
74for 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
84for line in sorted(messages):
85    print(line)
86print('\nTotal warnings: %d' % total)
87