From 60d9f8475af7b4cfca379279cc7dd3fe2ed83c1c Mon Sep 17 00:00:00 2001
From: Shoaib Meenai <smeenai@fb.com>
Date: Wed, 21 Sep 2016 08:07:33 -0700
Subject: [PATCH] Fix compilation for libc++ 3.9

Summary:
libc++ 3.9 and above define the __throw* functions inside stdexcept, so
defining them ourselves leads to compilation errors when compiling
against libc++ 3.9. Add appropriate preprocessor guards to avoid this.

Reviewed By: meyering

Differential Revision: D3898284

fbshipit-source-id: 435a28c2b3a83ee4d8f5af0df0343c524469011e
---
 folly/portability/BitsFunctexcept.cpp | 2 ++
 folly/portability/BitsFunctexcept.h   | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/folly/portability/BitsFunctexcept.cpp b/folly/portability/BitsFunctexcept.cpp
index 1a72b69b..f3ff3d6c 100644
--- a/folly/portability/BitsFunctexcept.cpp
+++ b/folly/portability/BitsFunctexcept.cpp
@@ -21,6 +21,7 @@
 
 FOLLY_NAMESPACE_STD_BEGIN
 
+#if !defined(_LIBCPP_VERSION) || _LIBCPP_VERSION < 3900
 void __throw_length_error(const char* msg) {
   throw std::length_error(msg);
 }
@@ -32,6 +33,7 @@ void __throw_logic_error(const char* msg) {
 void __throw_out_of_range(const char* msg) {
   throw std::out_of_range(msg);
 }
+#endif
 
 #ifdef _MSC_VER
 void __throw_bad_alloc() {
diff --git a/folly/portability/BitsFunctexcept.h b/folly/portability/BitsFunctexcept.h
index 098d1e7b..080b0f33 100644
--- a/folly/portability/BitsFunctexcept.h
+++ b/folly/portability/BitsFunctexcept.h
@@ -25,9 +25,11 @@
 #include <folly/Portability.h>
 FOLLY_NAMESPACE_STD_BEGIN
 
+#if !defined(_LIBCPP_VERSION) || _LIBCPP_VERSION < 3900
 [[noreturn]] void __throw_length_error(const char* msg);
 [[noreturn]] void __throw_logic_error(const char* msg);
 [[noreturn]] void __throw_out_of_range(const char* msg);
+#endif
 
 #ifdef _MSC_VER
 [[noreturn]] void __throw_bad_alloc();
-- 
2.34.1