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Fix PR38160 - init_priority attribute not supported by GCC on Apple.

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This patch guards the use of __attribute__((init_priority(101)))
within memory_resource.cpp when building with compilers that don't
support it. Specifically GCC on Apple platforms, and MSVC.

llvm-svn: 337205
This commit is contained in:
Eric Fiselier 2018-07-16 20:01:59 +00:00
parent c7f8ac7896
commit 241d4ad761
1 changed files with 12 additions and 1 deletions
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13
libcxx/src/experimental/memory_resource.cpp
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@ -68,12 +68,23 @@ union ResourceInitHelper {
_LIBCPP_CONSTEXPR_AFTER_CXX11 ResourceInitHelper() : resources() {}
~ResourceInitHelper() {}
};
// Detect if the init_priority attribute is supported.
#if (defined(_LIBCPP_COMPILER_GCC) && defined(__APPLE__)) \
|| defined(_LIBCPP_COMPILER_MSVC)
// GCC on Apple doesn't support the init priority attribute,
// and MSVC doesn't support any GCC attributes.
# define _LIBCPP_INIT_PRIORITY_MAX
#else
# define _LIBCPP_INIT_PRIORITY_MAX __attribute__((init_priority(101)))
#endif
// When compiled in C++14 this initialization should be a constant expression.
// Only in C++11 is "init_priority" needed to ensure initialization order.
#if _LIBCPP_STD_VER > 11
_LIBCPP_SAFE_STATIC
#endif
ResourceInitHelper res_init __attribute__((init_priority (101)));
ResourceInitHelper res_init _LIBCPP_INIT_PRIORITY_MAX;
} // end namespace