1 //===----------------------------- config.h -------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 // 9 // Defines macros used within the libc++abi project. 10 // 11 //===----------------------------------------------------------------------===// 12 13 14 #ifndef LIBCXXABI_CONFIG_H 15 #define LIBCXXABI_CONFIG_H 16 17 #include <unistd.h> 18 19 #if defined(_POSIX_THREADS) && _POSIX_THREADS > 0 20 # define LIBCXXABI_SINGLE_THREADED 0 21 #else 22 # define LIBCXXABI_SINGLE_THREADED 1 23 #endif 24 25 // Set this in the CXXFLAGS when you need it, because otherwise we'd have to 26 // #if !defined(__linux__) && !defined(__APPLE__) && ... 27 // and so-on for *every* platform. 28 #ifndef LIBCXXABI_BARE_METAL 29 # define LIBCXXABI_BARE_METAL 0 30 #endif 31 32 // -- BEGIN Taken from gabixx_config.h for gcc compat 33 // Clang provides __sync_swap(), but GCC does not. 34 // IMPORTANT: For GCC, __sync_lock_test_and_set has acquire semantics only 35 // so an explicit __sync_synchronize is needed to ensure a full barrier. 36 // TODO(digit): Use __atomic_swap_acq_rel when available. 37 #if !defined(__clang__) 38 # define __sync_swap(address, value) \ 39 __extension__ ({ \ 40 __typeof__(*(address)) __ret = __sync_lock_test_and_set((address),(value)); \ 41 __sync_synchronize(); \ 42 __ret; \ 43 }) 44 #endif 45 // -- END Taken from gabixx_config.h for gcc compat 46 47 48 #endif // LIBCXXABI_CONFIG_H 49
