[PATCH] D42987: [libc++abi] fix compilation in C++17 mode

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith created this revision.
rsmith added reviewers: EricWF, mclow.lists.
Herald added a subscriber: sanjoy.

C++17 removes `std::unexpected_handler`, but libc++abi needs it to define `__cxa_exception`. When building against libc++, this is easily rectified by telling libc++ we're building the library. We already do this in the other places where we need these symbols.


Repository:
  rCXXA libc++abi

https://reviews.llvm.org/D42987

Files:
  src/cxa_exception.cpp


Index: src/cxa_exception.cpp
===================================================================
--- src/cxa_exception.cpp
+++ src/cxa_exception.cpp
@@ -11,6 +11,8 @@
 //  
 //===----------------------------------------------------------------------===//
 
+#define _LIBCPP_BUILDING_LIBRARY
+
 #include "cxxabi.h"
 
 #include <exception>        // for std::terminate


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