SuperTuxKart 1.5 upstream source (from official release tarball)
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Benjamin
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/* Detect Clang Version
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* Created by Evan Nemerson <evan@nemerson.com>
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*
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* To the extent possible under law, the author(s) have dedicated all
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* copyright and related and neighboring rights to this software to
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* the public domain worldwide. This software is distributed without
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* any warranty.
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*
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* For details, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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* SPDX-License-Identifier: CC0-1.0
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*/
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/* This file was originally part of SIMDe
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* (<https://github.com/simd-everywhere/simde>). You're free to do with it as
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* you please, but I do have a few small requests:
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*
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* * If you make improvements, please submit them back to SIMDe
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* (at <https://github.com/simd-everywhere/simde/issues>) so others can
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* benefit from them.
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* * Please keep a link to SIMDe intact so people know where to submit
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* improvements.
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* * If you expose it publicly, please change the SIMDE_ prefix to
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* something specific to your project.
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*
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* The version numbers clang exposes (in the ___clang_major__,
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* __clang_minor__, and __clang_patchlevel__ macros) are unreliable.
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* Vendors such as Apple will define these values to their version
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* numbers; for example, "Apple Clang 4.0" is really clang 3.1, but
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* __clang_major__ and __clang_minor__ are defined to 4 and 0
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* respectively, instead of 3 and 1.
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*
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* The solution is *usually* to use clang's feature detection macros
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* (<https://clang.llvm.org/docs/LanguageExtensions.html#feature-checking-macros>)
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* to determine if the feature you're interested in is available. This
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* generally works well, and it should probably be the first thing you
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* try. Unfortunately, it's not possible to check for everything. In
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* particular, compiler bugs.
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*
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* This file just uses the feature checking macros to detect features
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* added in specific versions of clang to identify which version of
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* clang the compiler is based on.
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*
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* Right now it only goes back to 3.6, but I'm happy to accept patches
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* to go back further. And, of course, newer versions are welcome if
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* they're not already present, and if you find a way to detect a point
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* release that would be great, too!
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*/
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#if !defined(SIMDE_DETECT_CLANG_H)
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#define SIMDE_DETECT_CLANG_H 1
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/* Attempt to detect the upstream clang version number. I usually only
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* worry about major version numbers (at least for 4.0+), but if you
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* need more resolution I'm happy to accept patches that are able to
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* detect minor versions as well. That said, you'll probably have a
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* hard time with detection since AFAIK most minor releases don't add
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* anything we can detect. Updated based on
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* https://github.com/google/highway/blob/438c705a295176b96a50336527bb3e7ea365ffac/hwy/detect_compiler_arch.h#L73
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* - would welcome patches/updates there as well.
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*/
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#if defined(__clang__) && !defined(SIMDE_DETECT_CLANG_VERSION)
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# if __has_warning("-Wmissing-designated-field-initializers")
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# define SIMDE_DETECT_CLANG_VERSION 190000
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# elif __has_warning("-Woverriding-option")
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# define SIMDE_DETECT_CLANG_VERSION 180000
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# elif __has_attribute(unsafe_buffer_usage) // no new warnings in 17.0
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# define SIMDE_DETECT_CLANG_VERSION 170000
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# elif __has_attribute(nouwtable) // no new warnings in 16.0
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# define SIMDE_DETECT_CLANG_VERSION 160000
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# elif __has_warning("-Warray-parameter")
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# define SIMDE_DETECT_CLANG_VERSION 150000
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# elif __has_warning("-Wbitwise-instead-of-logical")
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# define SIMDE_DETECT_CLANG_VERSION 140000
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# elif __has_warning("-Waix-compat")
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# define SIMDE_DETECT_CLANG_VERSION 130000
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# elif __has_warning("-Wformat-insufficient-args")
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# define SIMDE_DETECT_CLANG_VERSION 120000
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# elif __has_warning("-Wimplicit-const-int-float-conversion")
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# define SIMDE_DETECT_CLANG_VERSION 110000
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# elif __has_warning("-Wmisleading-indentation")
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# define SIMDE_DETECT_CLANG_VERSION 100000
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# elif defined(__FILE_NAME__)
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# define SIMDE_DETECT_CLANG_VERSION 90000
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# elif __has_warning("-Wextra-semi-stmt") || __has_builtin(__builtin_rotateleft32)
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# define SIMDE_DETECT_CLANG_VERSION 80000
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// For reasons unknown, Xcode 10.3 (Apple LLVM version 10.0.1) is apparently
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// based on Clang 7, but does not support the warning we test.
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// See https://en.wikipedia.org/wiki/Xcode#Toolchain_versions and
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// https://trac.macports.org/wiki/XcodeVersionInfo.
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# elif __has_warning("-Wc++98-compat-extra-semi") || \
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(defined(__apple_build_version__) && __apple_build_version__ >= 10010000)
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# define SIMDE_DETECT_CLANG_VERSION 70000
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# elif __has_warning("-Wpragma-pack")
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# define SIMDE_DETECT_CLANG_VERSION 60000
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# elif __has_warning("-Wbitfield-enum-conversion")
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# define SIMDE_DETECT_CLANG_VERSION 50000
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# elif __has_attribute(diagnose_if)
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# define SIMDE_DETECT_CLANG_VERSION 40000
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# elif __has_warning("-Wcomma")
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# define SIMDE_DETECT_CLANG_VERSION 39000
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# elif __has_warning("-Wdouble-promotion")
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# define SIMDE_DETECT_CLANG_VERSION 38000
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# elif __has_warning("-Wshift-negative-value")
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# define SIMDE_DETECT_CLANG_VERSION 37000
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# elif __has_warning("-Wambiguous-ellipsis")
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# define SIMDE_DETECT_CLANG_VERSION 36000
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# else
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# define SIMDE_DETECT_CLANG_VERSION 1
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# endif
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#endif /* defined(__clang__) && !defined(SIMDE_DETECT_CLANG_VERSION) */
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/* The SIMDE_DETECT_CLANG_VERSION_CHECK macro is pretty
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* straightforward; it returns true if the compiler is a derivative
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* of clang >= the specified version.
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*
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* Since this file is often (primarily?) useful for working around bugs
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* it is also helpful to have a macro which returns true if only if the
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* compiler is a version of clang *older* than the specified version to
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* make it a bit easier to ifdef regions to add code for older versions,
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* such as pragmas to disable a specific warning. */
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#if defined(SIMDE_DETECT_CLANG_VERSION)
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# define SIMDE_DETECT_CLANG_VERSION_CHECK(major, minor, revision) (SIMDE_DETECT_CLANG_VERSION >= ((major * 10000) + (minor * 1000) + (revision)))
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# define SIMDE_DETECT_CLANG_VERSION_NOT(major, minor, revision) (SIMDE_DETECT_CLANG_VERSION < ((major * 10000) + (minor * 1000) + (revision)))
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#else
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# define SIMDE_DETECT_CLANG_VERSION_CHECK(major, minor, revision) (0)
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# define SIMDE_DETECT_CLANG_VERSION_NOT(major, minor, revision) (0)
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#endif
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#endif /* !defined(SIMDE_DETECT_CLANG_H) */
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