summaryrefslogtreecommitdiffstats
path: root/diag-control.h
blob: 3eb6bcaaf02094c5ac8c834339e81ec8b2d6238f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
/*
 * Copyright (c) 1993, 1994, 1995, 1996, 1997
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the Computer Systems
 *	Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _diag_control_h
#define _diag_control_h

#include "compiler-tests.h"

#ifndef _MSC_VER
  /*
   * Clang and GCC both support this way of putting pragmas into #defines.
   * We don't use it unless we have a compiler that supports it; the
   * warning-suppressing pragmas differ between Clang and GCC, so we test
   * for both of those separately.
   */
  #define DIAG_DO_PRAGMA(x) _Pragma (#x)
#endif

/*
 * XL C 12.1 and 13.1 for AIX require no attention in this department.
 * XL C 16.1 defines both __GNUC__ and __clang__, so has to be tested first.
 */
#if ND_IS_AT_LEAST_XL_C_VERSION(16,1)
  /*
   * See respective Clang note below.
   */
  #define DIAG_OFF_ASSIGN_ENUM \
    DIAG_DO_PRAGMA(clang diagnostic push) \
    DIAG_DO_PRAGMA(clang diagnostic ignored "-Wassign-enum")
  #define DIAG_ON_ASSIGN_ENUM \
    DIAG_DO_PRAGMA(clang diagnostic pop)

  #define DIAG_OFF_CAST_QUAL
  #define DIAG_ON_CAST_QUAL
  #define DIAG_OFF_DEPRECATION
  #define DIAG_ON_DEPRECATION
/*
 * The current clang compilers also define __GNUC__ and __GNUC_MINOR__
 * thus we need to test the clang case before the GCC one
 */
#elif ND_IS_AT_LEAST_CLANG_VERSION(2,8)
  /*
   * Clang complains if you OR together multiple enum values of a
   * given enum type and them pass it as an argument of that enum
   * type.  Some libcap-ng routines use enums to define bit flags;
   * we want to squelch the warnings that produces.
   */
  #define DIAG_OFF_ASSIGN_ENUM \
    DIAG_DO_PRAGMA(clang diagnostic push) \
    DIAG_DO_PRAGMA(clang diagnostic ignored "-Wassign-enum")
  #define DIAG_ON_ASSIGN_ENUM \
    DIAG_DO_PRAGMA(clang diagnostic pop)

  /*
   * It also legitimately complains about some code in the BSD
   * getopt_long() - that code explicitly and deliberately
   * violates the contract by permuting the argument vector
   * (declared as char const *argv[], meaning "I won't change
   * the vector by changing any of its elements), as do the
   * GNU and Solaris getopt_long().  This is documented in the
   * man pages for all versions; it can be suppressed by setting
   * the environment variable POSIXLY_CORRECT or by putting a "+"
   * at the beginning of the option string.
   *
   * We suppress the warning.
   */
  #define DIAG_OFF_CAST_QUAL \
    DIAG_DO_PRAGMA(clang diagnostic push) \
    DIAG_DO_PRAGMA(clang diagnostic ignored "-Wcast-qual")
  #define DIAG_ON_CAST_QUAL \
    DIAG_DO_PRAGMA(clang diagnostic pop)

  /*
   * Suppress deprecation warnings.
   */
  #define DIAG_OFF_DEPRECATION \
    DIAG_DO_PRAGMA(clang diagnostic push) \
    DIAG_DO_PRAGMA(clang diagnostic ignored "-Wdeprecated-declarations")
  #define DIAG_ON_DEPRECATION \
    DIAG_DO_PRAGMA(clang diagnostic pop)

  /*
   * Clang supports the generic C11 extension even if run with the -std=gnu99
   * flag, which leads FreeBSD <sys/cdefs.h> to use the extension, which
   * results in Clang emitting a -Wc11-extensions warning. The warning is not
   * documented in the user manual, but it happens with Clang 10.0.1 on
   * FreeBSD 12.2, so let's use that as a reference.
   */
  #if ND_IS_AT_LEAST_CLANG_VERSION(10,0)
    #define DIAG_OFF_C11_EXTENSIONS \
      DIAG_DO_PRAGMA(clang diagnostic push) \
      DIAG_DO_PRAGMA(clang diagnostic ignored "-Wc11-extensions")
    #define DIAG_ON_C11_EXTENSIONS \
      DIAG_DO_PRAGMA(clang diagnostic pop)
  #endif
#elif ND_IS_AT_LEAST_GNUC_VERSION(4,2)
  /* GCC apparently doesn't complain about ORing enums together. */
  #define DIAG_OFF_ASSIGN_ENUM
  #define DIAG_ON_ASSIGN_ENUM

  /*
   * It does, however, complain about casting away constness in
   * missing/getopt_long.c.
   */
  #define DIAG_OFF_CAST_QUAL \
    DIAG_DO_PRAGMA(GCC diagnostic push) \
    DIAG_DO_PRAGMA(GCC diagnostic ignored "-Wcast-qual")
  #define DIAG_ON_CAST_QUAL \
    DIAG_DO_PRAGMA(GCC diagnostic pop)

  /*
   * Suppress deprecation warnings.
   */
  #define DIAG_OFF_DEPRECATION \
    DIAG_DO_PRAGMA(GCC diagnostic push) \
    DIAG_DO_PRAGMA(GCC diagnostic ignored "-Wdeprecated-declarations")
  #define DIAG_ON_DEPRECATION \
    DIAG_DO_PRAGMA(GCC diagnostic pop)
  /*
   * GCC supports -Wc99-c11-compat since version 5.1.0, but the warning does
   * not trigger for now, so let's just leave it be.
   */
#else
  #define DIAG_OFF_ASSIGN_ENUM
  #define DIAG_ON_ASSIGN_ENUM
  #define DIAG_OFF_CAST_QUAL
  #define DIAG_ON_CAST_QUAL
  #define DIAG_OFF_DEPRECATION
  #define DIAG_ON_DEPRECATION
#endif

#ifndef DIAG_OFF_C11_EXTENSIONS
#define DIAG_OFF_C11_EXTENSIONS
#endif
#ifndef DIAG_ON_C11_EXTENSIONS
#define DIAG_ON_C11_EXTENSIONS
#endif

/*
 * GCC needs this on AIX for longjmp().
 */
#if ND_IS_AT_LEAST_GNUC_VERSION(5,1)
  /*
   * Beware that the effect of this builtin is more than just squelching the
   * warning! GCC trusts it enough for the process to segfault if the control
   * flow reaches the builtin (an infinite empty loop in the same context would
   * squelch the warning and ruin the process too, albeit in a different way).
   * So please remember to use this very carefully.
   */
  #define ND_UNREACHABLE __builtin_unreachable();
#else
  #define ND_UNREACHABLE
#endif

#endif /* _diag_control_h */