fe311b9cc5
The advantage of using this compiler builtin instead of our own platform checks is that the compiler will warn us (if -Wunguarded-availability is turned on for APIs introduced before 10.13 or by default for later ones) if a check is forgotten, which is not the case for the manual checks. Update the code to use WX_IS_MACOS_AVAILABLE() macro, which expands to __builtin_available() when supported, and also use API_AVAILABLE() where it makes sense to avoid having too many checks.
35 lines
1.5 KiB
C
35 lines
1.5 KiB
C
///////////////////////////////////////////////////////////////////////////////
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// Name: wx/osx/private/available.h
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// Purpose: Helper for checking API availability under macOS.
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// Author: Vadim Zeitlin
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// Created: 2019-04-17
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// Copyright: (c) 2019 Vadim Zeitlin <vadim@wxwidgets.org>
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_OSX_PRIVATE_AVAILABLE_H_
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#define _WX_OSX_PRIVATE_AVAILABLE_H_
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// Xcode 9 adds new @available keyword and the corresponding __builtin_available
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// builtin which should be used instead of manually checks for API availability
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// as using this builtin suppresses the compiler -Wunguarded-availability
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// warnings, so use it if possible for the implementation of our own macro.
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#if defined(__clang__) && __has_builtin(__builtin_available)
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#define WX_IS_MACOS_AVAILABLE(major, minor) \
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__builtin_available(macOS major ## . ## minor, *)
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// Note that we can't easily forward to API_AVAILABLE macro here, so go
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// directly to its expansion instead.
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#define WX_API_AVAILABLE_MACOS(major, minor) \
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__attribute__((availability(macos,introduced=major ## . ## minor)))
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#else // Not clang or old clang version without __builtin_available
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#include "wx/platinfo.h"
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#define WX_IS_MACOS_AVAILABLE(major, minor) \
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wxPlatformInfo::Get().CheckOSVersion(major, minor)
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#define WX_API_AVAILABLE_MACOS(major, minor)
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#endif
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#endif // _WX_OSX_PRIVATE_AVAILABLE_H_
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