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/* ws_compiler_tests.h
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef __WS_COMPILER_TESTS_H__
#define __WS_COMPILER_TESTS_H__
/*
* This was introduced by Clang:
*
* http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
*
* in some version (which version?); it has been picked up by GCC 5.0.
*/
#ifndef __has_attribute
/*
* It's a macro, so you can check whether it's defined to check
* whether it's supported.
*
* If it's not, define it to always return 0, so that we move on to
* the fallback checks.
*/
#define __has_attribute(x) 0
#endif
/*
* Note that the C90 spec's "6.8.1 Conditional inclusion" and the
* C99 spec's and C11 spec's "6.10.1 Conditional inclusion" say:
*
* Prior to evaluation, macro invocations in the list of preprocessing
* tokens that will become the controlling constant expression are
* replaced (except for those macro names modified by the defined unary
* operator), just as in normal text. If the token "defined" is
* generated as a result of this replacement process or use of the
* "defined" unary operator does not match one of the two specified
* forms prior to macro replacement, the behavior is undefined.
*
* so you shouldn't use defined() in a #define that's used in #if or
* #elif. Some versions of Clang, for example, will warn about this.
*
* Instead, we check whether the pre-defined macros for particular
* compilers are defined and, if not, define the "is this version XXX
* or a later version of this compiler" macros as 0.
*/
/*
* Check whether this is GCC major.minor or a later release, or some
* compiler that claims to be "just like GCC" of that version or a
* later release.
*/
#if !defined(__GNUC__)
#define WS_IS_AT_LEAST_GNUC_VERSION(major, minor) 0
#else
#define WS_IS_AT_LEAST_GNUC_VERSION(major, minor) \
(__GNUC__ > (major) || \
(__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
#endif
/*
* Check if the compiler is GCC and not a compiler from another
* vendor that also defines __GNUC__ (claiming support for GNU C dialect).
* Unfortunately there is no way to test this directly so we need
* to exclude other known compilers that claim such support (hacky).
*/
#if defined(__GNUC__) && \
!defined(__clang__) && \
!defined(__INTEL_COMPILER) && \
!defined(__INTEL_LLVM_COMPILER)
#define WS_GCC_VERSION \
(__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL)
#endif
/*
* Check whether this is Clang major.minor or a later release.
*/
#if !defined(__clang__)
#define WS_IS_AT_LEAST_CLANG_VERSION(major, minor) 0
#else
#define WS_IS_AT_LEAST_CLANG_VERSION(major, minor) \
(__clang_major__ > (major) || \
(__clang_major__ == (major) && __clang_minor__ >= (minor)))
#endif
/*
* Check whether this is Sun C/SunPro C/Oracle Studio major.minor
* or a later release.
*
* The version number in __SUNPRO_C is encoded in hex BCD, with the
* uppermost hex digit being the major version number, the next
* one or two hex digits being the minor version number, and
* the last digit being the patch version.
*
* It represents the *compiler* version, not the product version;
* see
*
* https://sourceforge.net/p/predef/wiki/Compilers/
*
* for a partial mapping, which we assume continues for later
* 12.x product releases.
*/
#if !defined(__SUNPRO_C)
#define WS_IS_AT_LEAST_SUNC_VERSION(major, minor) 0
#else
#define WS_SUNPRO_VERSION_TO_BCD(major, minor) \
(((minor) >= 10) ? \
(((major) << 12) | (((minor)/10) << 8) | (((minor)%10) << 4)) : \
(((major) << 8) | ((minor) << 4)))
#define WS_IS_AT_LEAST_SUNC_VERSION(major, minor) \
(__SUNPRO_C >= WS_SUNPRO_VERSION_TO_BCD((major), (minor)))
#endif
/*
* Check whether this is IBM XL C major.minor or a later release.
*
* The version number in __xlC__ has the major version in the
* upper 8 bits and the minor version in the lower 8 bits.
*/
#if !defined(__xlC__)
#define WS_IS_AT_LEAST_XL_C_VERSION(major, minor) 0
#else
#define WS_IS_AT_LEAST_XL_C_VERSION(major, minor) \
(__xlC__ >= (((major) << 8) | (minor)))
#endif
/*
* Check whether this is HP aC++/HP C major.minor or a later release.
*
* The version number in __HP_aCC is encoded in zero-padded decimal BCD,
* with the "A." stripped off, the uppermost two decimal digits being
* the major version number, the next two decimal digits being the minor
* version number, and the last two decimal digits being the patch version.
* (Strip off the A., remove the . between the major and minor version
* number, and add two digits of patch.)
*/
#if !defined(__HP_aCC)
#define WS_IS_AT_LEAST_HP_C_VERSION(major, minor) 0
#else
#define WS_IS_AT_LEAST_HP_C_VERSION(major, minor) \
(__HP_aCC >= ((major)*10000 + (minor)*100))
#endif
#endif /* __WS_COMPILER_TESTS_H__ */
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