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