/* -*- 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)
/*
* 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)
/*
* 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
/*
* When Clang correctly detects an old-style function prototype after
* preprocessing, the warning can be irrelevant to this source tree because
* the prototype comes from a system header macro.
*/
#if ND_IS_AT_LEAST_CLANG_VERSION(5,0)
#define DIAG_OFF_STRICT_PROTOTYPES \
DIAG_DO_PRAGMA(clang diagnostic push) \
DIAG_DO_PRAGMA(clang diagnostic ignored "-Wstrict-prototypes")
#define DIAG_ON_STRICT_PROTOTYPES \
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. */
/*
* 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)
#if ND_IS_AT_LEAST_GNUC_VERSION(4,5)
/*
* GCC warns about unused return values if a function is marked as
* "warn about ignoring this function's return value".
*
* Clang appears to let you ignore a result without a warning by
* casting the function result to void, so we don't appear to
* need this for Clang.
*/
#define DIAG_OFF_WARN_UNUSED_RESULT \
DIAG_DO_PRAGMA(GCC diagnostic push) \
DIAG_DO_PRAGMA(GCC diagnostic ignored "-Wunused-result")
#define DIAG_ON_WARN_UNUSED_RESULT \
DIAG_DO_PRAGMA(GCC diagnostic pop)
#endif
/*
* 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.
*
* GCC does not currently generate any -Wstrict-prototypes warnings that
* would need silencing as is done for Clang above.
*/
#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();
#endif
