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[libc++] Don't alias quick_exit if __ANDROID_API__ < 21 

Summary:
quick_exit() and at_quick_exit() were introduced in android NDK 21:
https://android.googlesource.com/platform/prebuilts/ndk/+/dev/platform/sysroot/usr/include/stdlib.h#55

This CL conditions `_LIBCPP_HAS_QUICK_EXIT` on `__ANDROID_API__ >= 21`.  The only place this macro is used is in some using declarations: `using ::quick_exit`, `using ::at_quick_exit`.

Also, add a missing include to sys/cdefs.h which is what defines `__BIONIC__`.

Reviewers: thakis, danalbert, EricWF

Reviewed By: danalbert

Subscribers: srhines, krytarowski

Differential Revision: https://reviews.llvm.org/D39479

llvm-svn: 317124
This commit is contained in:
Dan Albert 2017-11-01 21:17:56 +00:00
parent 0ad18f888e
commit 5a4e27dfa6
1 changed files with 5 additions and 1 deletions
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6
libcxx/include/__config
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@ -296,6 +296,10 @@
#define _LIBCPP_NO_CFI
#endif
#if __libcpp_has_include(<sys/cdefs.h>)
#include <sys/cdefs.h>
#endif
#if defined(_LIBCPP_COMPILER_CLANG)
// _LIBCPP_ALTERNATE_STRING_LAYOUT is an old name for
@ -407,7 +411,7 @@ typedef __char32_t char32_t;
#define _LIBCPP_HAS_C11_FEATURES
#elif defined(__linux__)
#if !defined(_LIBCPP_HAS_MUSL_LIBC)
#if __GLIBC_PREREQ(2, 15) || defined(__BIONIC__)
#if __GLIBC_PREREQ(2, 15) || (defined(__BIONIC__) && (__ANDROID_API__ >= 21))
#define _LIBCPP_HAS_QUICK_EXIT
#endif
#if __GLIBC_PREREQ(2, 17)