Add libc++ and libc++abi to third-party.

third_party/libc++abi/src/Unwind/config.h

+//===----------------------------- config.h -------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//
+//  Defines macros used within libuwind project.
+//
+//===----------------------------------------------------------------------===//
+
+
+#ifndef LIBUNWIND_CONFIG_H
+#define LIBUNWIND_CONFIG_H
+
+#include <assert.h>
+
+// Define static_assert() unless already defined by compiler.
+#ifndef __has_feature
+  #define __has_feature(__x) 0
+#endif
+#if !(__has_feature(cxx_static_assert))
+  #define static_assert(__b, __m) \
+      extern int compile_time_assert_failed[ ( __b ) ? 1 : -1 ]  \
+                                                  __attribute__( ( unused ) );
+#endif
+
+// Platform specific configuration defines.
+#if __APPLE__
+  #include <Availability.h>
+  #ifdef __cplusplus
+    extern "C" {
+  #endif
+    void __assert_rtn(const char *, const char *, int, const char *)
+                                                      __attribute__((noreturn));
+  #ifdef __cplusplus
+    }
+  #endif
+
+  #define _LIBUNWIND_BUILD_ZERO_COST_APIS (__i386__ || __x86_64__ || __arm64__)
+  #define _LIBUNWIND_BUILD_SJLJ_APIS      (__arm__)
+  #define _LIBUNWIND_SUPPORT_FRAME_APIS   (__i386__ || __x86_64__)
+  #define _LIBUNWIND_EXPORT               __attribute__((visibility("default")))
+  #define _LIBUNWIND_HIDDEN               __attribute__((visibility("hidden")))
+  #define _LIBUNWIND_LOG(msg, ...) fprintf(stderr, "libuwind: " msg, __VA_ARGS__)
+  #define _LIBUNWIND_ABORT(msg) __assert_rtn(__func__, __FILE__, __LINE__, msg)
+
+  #if FOR_DYLD
+    #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND 1
+    #define _LIBUNWIND_SUPPORT_DWARF_UNWIND   0
+    #define _LIBUNWIND_SUPPORT_DWARF_INDEX    0
+  #else
+    #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND 1
+    #define _LIBUNWIND_SUPPORT_DWARF_UNWIND   1
+    #define _LIBUNWIND_SUPPORT_DWARF_INDEX    0
+  #endif
+
+#else
+  // #define _LIBUNWIND_BUILD_ZERO_COST_APIS
+  // #define _LIBUNWIND_BUILD_SJLJ_APIS
+  // #define _LIBUNWIND_SUPPORT_FRAME_APIS
+  // #define _LIBUNWIND_EXPORT
+  // #define _LIBUNWIND_HIDDEN
+  // #define _LIBUNWIND_LOG()
+  // #define _LIBUNWIND_ABORT()
+  // #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND
+  // #define _LIBUNWIND_SUPPORT_DWARF_UNWIND
+  // #define _LIBUNWIND_SUPPORT_DWARF_INDEX
+#endif
+
+
+// Macros that define away in non-Debug builds
+#ifdef NDEBUG
+  #define _LIBUNWIND_DEBUG_LOG(msg, ...)
+  #define _LIBUNWIND_TRACE_API(msg, ...)
+  #define _LIBUNWIND_TRACING_UNWINDING 0
+  #define _LIBUNWIND_TRACE_UNWINDING(msg, ...)
+  #define _LIBUNWIND_LOG_NON_ZERO(x) x
+#else
+  #ifdef __cplusplus
+    extern "C" {
+  #endif
+    extern  bool logAPIs();
+    extern  bool logUnwinding();
+  #ifdef __cplusplus
+    }
+  #endif
+  #define _LIBUNWIND_DEBUG_LOG(msg, ...)  _LIBUNWIND_LOG(msg, __VA_ARGS__)
+  #define _LIBUNWIND_LOG_NON_ZERO(x) \
+            do { \
+              int _err = x; \
+              if ( _err != 0 ) \
+                _LIBUNWIND_LOG("" #x "=%d in %s", _err, __FUNCTION__); \
+             } while (0)
+  #define _LIBUNWIND_TRACE_API(msg, ...) \
+            do { \
+              if ( logAPIs() ) _LIBUNWIND_LOG(msg, __VA_ARGS__); \
+            } while(0)
+  #define _LIBUNWIND_TRACE_UNWINDING(msg, ...) \
+            do { \
+              if ( logUnwinding() ) _LIBUNWIND_LOG(msg, __VA_ARGS__); \
+            } while(0)
+  #define _LIBUNWIND_TRACING_UNWINDING logUnwinding()
+#endif
+
+
+#endif // LIBUNWIND_CONFIG_H