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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*/
#ifndef __included_warnings_h__
#define __included_warnings_h__
/* Macros to check compiler version */
#if defined(__GNUC__)
#define COMPILER_VERSION_GTE(major, minor) \
(__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
#elif defined(__clang__)
#define COMPILER_VERSION_GTE(major, minor) \
(__clang_major__ > (major) || \
(__clang_major__ == (major) && __clang_minor__ >= (minor)))
#else /* disable all warning customization for all other compilers */
#define COMPILER_VERSION_GTE(maj, min) 0
#endif
/* '#' needs to preceed a macro parameter */
#define WARN_TOSTR(x) #x
/*
* Macros to toggle off/on warnings
*
* Start by silencing pragma warnings so that we can explicitly silence
* a warning introduced on some compiler version and not get a warning on older
* versions of that same compiler.
*
* gcc corresponding warning is "Wpargma"
* clang corresponding warning is "Wunknown-warning-option"
*
* For example, Wtautological-compare is introduced in gcc-6 and this would
* trigger a Wpargma warning on gcc-5.
*
* Example usage to disable -Wtautological-compare warning:
* WARN_OFF(tautological-compare)
* if (...) {
* WARN_ON(tautological-compare)
* ; // conditional code
* }
*/
#if defined(__GNUC__) && COMPILER_VERSION_GTE(4, 6)
/*
* GCC option to locally ignore warning was introduced in gcc-4.6
* gcc.gnu.org/gcc-4.6/changes.html
*/
#define WARN_PRAGMA(x) _Pragma (WARN_TOSTR (GCC diagnostic x))
#define WARN_OFF(x) \
WARN_PRAGMA (push) WARN_PRAGMA (ignored "-Wpragmas") \
WARN_PRAGMA (push) WARN_PRAGMA (ignored WARN_TOSTR (-W##x))
#define WARN_ON(x) \
WARN_PRAGMA (pop) \
WARN_PRAGMA (pop)
#elif defined(__clang__) && COMPILER_VERSION_GTE(3, 3)
/*
* clang option to locally ignore warning was introduced in clang-3.3
* releases.llvm.org/3.3/tools/clang/docs/UsersManual.html#controlling-diagnostics-via-pragmas
*/
#define WARN_PRAGMA(x) _Pragma (WARN_TOSTR (clang diagnostic x))
#define WARN_OFF(x) \
WARN_PRAGMA (push) WARN_PRAGMA (ignored "-Wunknown-warning-option") \
WARN_PRAGMA (push) WARN_PRAGMA (ignored WARN_TOSTR (-W##x))
#define WARN_ON(x) \
WARN_PRAGMA (pop) \
WARN_PRAGMA (pop)
#else
/* Ignore WARN_* instruction for all other compilers */
#define WARN_OFF(x)
#define WARN_ON(x)
#endif
/*
* Clang supports a wider range of warnings than gcc.
* Use those specific macros for the warnings that are only supported by clang
*/
#ifdef __clang__
#define WARN_OFF_CLANG(x) WARN_OFF (x)
#define WARN_ON_CLANG(x) WARN_ON (x)
#else
#define WARN_OFF_CLANG(x)
#define WARN_ON_CLANG(x)
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
#endif /* __included_warnings_h__ */
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