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No need to define BOOST_NO_CXX11_THREAD_LOCAL for recent libc++ versions on Linux.

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Fixes https://github.com/boostorg/config/issues/231.
This commit is contained in:
jzmaddock
2018-08-04 08:25:09 +01:00
parent d265f48d7b
commit ffd6682a8b
1 changed files with 7 additions and 1 deletions
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8
include/boost/config/stdlib/libcpp.hpp
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@ -111,10 +111,16 @@
# define BOOST_NO_CXX11_THREAD_LOCAL
#endif
#if defined(__linux__) && !defined(BOOST_NO_CXX11_THREAD_LOCAL)
#if defined(__linux__) && (_LIBCPP_VERSION < 4000) && !defined(BOOST_NO_CXX11_THREAD_LOCAL)
// After libc++-dev is installed on Trusty, clang++-libc++ almost works,
// except uses of `thread_local` fail with undefined reference to
// `__cxa_thread_atexit`.
//
// clang's libc++abi provides an implementation by deferring to the glibc
// implementation, which may or may not be available (it is not on Trusty).
// clang 4's libc++abi will provide an implementation if one is not in glibc
// though, so thread local support should work with clang 4 and above as long
// as libc++abi is linked in.
# define BOOST_NO_CXX11_THREAD_LOCAL
#endif