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Restore support for ancient Mac OS

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Mac OS 10.4 and earlier lack Availability.h, causing compilation to
fail. Rearrange the macro logic to include Availability.h only if we
already think there may be support for uncaught exceptions.
This commit is contained in:
Evan Miller 2021-07-01 16:32:40 -04:00
parent 012d96a72b
commit 128d9314d6
1 changed files with 7 additions and 7 deletions
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14
include/boost/core/uncaught_exceptions.hpp
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@ -26,6 +26,7 @@
#pragma once
#endif
#if (defined(__cpp_lib_uncaught_exceptions) && __cpp_lib_uncaught_exceptions >= 201411)
#if defined(__APPLE__)
#include <Availability.h>
// Apple systems only support std::uncaught_exceptions starting with specific versions:
@ -34,16 +35,15 @@
// - tvOS >= 10.0
// - watchOS >= 3.0
// https://github.com/boostorg/core/issues/80
#if (defined(__cpp_lib_uncaught_exceptions) && __cpp_lib_uncaught_exceptions >= 201411) && \
( \
(defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 101200) || \
(defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED >= 100000) \
)
#if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 101200) || \
(defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED >= 100000)
#define BOOST_CORE_HAS_UNCAUGHT_EXCEPTIONS
#endif
#else
#define BOOST_CORE_HAS_UNCAUGHT_EXCEPTIONS
#endif // defined(__APPLE__)
// Visual Studio 14.0 supports N4152 std::uncaught_exceptions() but doesn't define __cpp_lib_uncaught_exceptions
#elif (defined(__cpp_lib_uncaught_exceptions) && __cpp_lib_uncaught_exceptions >= 201411) || \
(defined(_MSC_VER) && _MSC_VER >= 1900)
#elif (defined(_MSC_VER) && _MSC_VER >= 1900)
#define BOOST_CORE_HAS_UNCAUGHT_EXCEPTIONS
#endif