From 411d92cbf37a2bb7149ca25efb17fd6b2ff5459b Mon Sep 17 00:00:00 2001
From: Ivan Ponomarev <ivantrue@gmail.com>
Date: Wed, 9 Jan 2019 23:07:37 +0300
Subject: [PATCH] Forced backtrace() function usage on iOS, 32-bit ARM
 architecture. Used macros from Boost predef.

---
 include/boost/stacktrace/detail/collect_unwind.ipp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/boost/stacktrace/detail/collect_unwind.ipp b/include/boost/stacktrace/detail/collect_unwind.ipp
index 5580733..46e42e7 100644
--- a/include/boost/stacktrace/detail/collect_unwind.ipp
+++ b/include/boost/stacktrace/detail/collect_unwind.ipp
@@ -14,6 +14,13 @@
 
 #include <boost/stacktrace/safe_dump_to.hpp>
 
+// On iOS 32-bit ARM architecture _Unwind_Backtrace function doesn't exist, symbol is undefined.
+// Forcing libc backtrace() function usage.
+#include <boost/predef.h>
+#if defined(BOOST_OS_IOS_AVAILABLE) && defined(BOOST_ARCH_ARM_AVAILABLE) && BOOST_VERSION_NUMBER_MAJOR(BOOST_ARCH_ARM) < 8
+#define BOOST_STACKTRACE_USE_LIBC_BACKTRACE_FUNCTION
+#endif
+
 #if defined(BOOST_STACKTRACE_USE_LIBC_BACKTRACE_FUNCTION)
 #include <execinfo.h>
 #include <algorithm>