From b5e2058ec59577c1d3365955fbe490357958f8bc Mon Sep 17 00:00:00 2001
From: Antony Polukhin <antoshkka@gmail.com>
Date: Tue, 29 Aug 2017 20:27:18 +0300
Subject: [PATCH] Fixes for FreeBSD and other OSes that do not define
 _GNU_SOURCE but have _Unwind_Backtrace function

---
 build/has_windbg_cached.cpp                        | 2 +-
 include/boost/stacktrace/detail/collect_unwind.ipp | 4 ++++
 include/boost/stacktrace/detail/frame_msvc.ipp     | 2 +-
 src/addr2line.cpp                                  | 5 +++++
 src/backtrace.cpp                                  | 5 +++++
 src/basic.cpp                                      | 5 +++++
 6 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/build/has_windbg_cached.cpp b/build/has_windbg_cached.cpp
index e57cd87..ab0f462 100644
--- a/build/has_windbg_cached.cpp
+++ b/build/has_windbg_cached.cpp
@@ -12,7 +12,7 @@
 #include "dbgeng.h"
 
 #ifdef BOOST_NO_CXX11_THREAD_LOCAL
-#   error Your compiler does not support C++11 thread_local storage. It's impossible to build with BOOST_STACKTRACE_USE_WINDBG_CACHED.
+#   error Your compiler does not support C++11 thread_local storage. It`s impossible to build with BOOST_STACKTRACE_USE_WINDBG_CACHED.
 #endif
 
 int foo() {
diff --git a/include/boost/stacktrace/detail/collect_unwind.ipp b/include/boost/stacktrace/detail/collect_unwind.ipp
index 3ee4e8f..0324dca 100644
--- a/include/boost/stacktrace/detail/collect_unwind.ipp
+++ b/include/boost/stacktrace/detail/collect_unwind.ipp
@@ -17,6 +17,10 @@
 #include <unwind.h>
 #include <cstdio>
 
+#if !defined(_GNU_SOURCE) && !defined(BOOST_STACKTRACE_GNU_SOURCE_NOT_REQUIRED)
+#error "Boost.Stacktrace requires `_Unwind_Backtrace` function. Define `_GNU_SOURCE` macro or `BOOST_STACKTRACE_GNU_SOURCE_NOT_REQUIRED` if _Unwind_Backtrace is available without `_GNU_SOURCE`."
+#endif
+
 namespace boost { namespace stacktrace { namespace detail {
 
 struct unwind_state {
diff --git a/include/boost/stacktrace/detail/frame_msvc.ipp b/include/boost/stacktrace/detail/frame_msvc.ipp
index 6719598..6110524 100644
--- a/include/boost/stacktrace/detail/frame_msvc.ipp
+++ b/include/boost/stacktrace/detail/frame_msvc.ipp
@@ -164,7 +164,7 @@ public:
 #else
 
 #ifdef BOOST_NO_CXX11_THREAD_LOCAL
-#   error Your compiler does not support C++11 thread_local storage. It's impossible to build with BOOST_STACKTRACE_USE_WINDBG_CACHED.
+#   error Your compiler does not support C++11 thread_local storage. It`s impossible to build with BOOST_STACKTRACE_USE_WINDBG_CACHED.
 #endif
 
     static com_holder< ::IDebugSymbols>& get_thread_local_debug_inst() BOOST_NOEXCEPT {
diff --git a/src/addr2line.cpp b/src/addr2line.cpp
index 05073ae..9a64dd3 100644
--- a/src/addr2line.cpp
+++ b/src/addr2line.cpp
@@ -7,5 +7,10 @@
 #define BOOST_STACKTRACE_INTERNAL_BUILD_LIBS
 #define BOOST_STACKTRACE_USE_ADDR2LINE
 #define BOOST_STACKTRACE_LINK
+
+#ifndef _GNU_SOURCE
+#   define _GNU_SOURCE
+#endif
+
 #include <boost/stacktrace/detail/frame_unwind.ipp>
 #include <boost/stacktrace/safe_dump_to.hpp>
diff --git a/src/backtrace.cpp b/src/backtrace.cpp
index 8b45821..8ac9ec0 100644
--- a/src/backtrace.cpp
+++ b/src/backtrace.cpp
@@ -7,5 +7,10 @@
 #define BOOST_STACKTRACE_INTERNAL_BUILD_LIBS
 #define BOOST_STACKTRACE_USE_BACKTRACE
 #define BOOST_STACKTRACE_LINK
+
+#ifndef _GNU_SOURCE
+#   define _GNU_SOURCE
+#endif
+
 #include <boost/stacktrace/detail/frame_unwind.ipp>
 #include <boost/stacktrace/safe_dump_to.hpp>
diff --git a/src/basic.cpp b/src/basic.cpp
index 5487f70..5ae71ba 100644
--- a/src/basic.cpp
+++ b/src/basic.cpp
@@ -6,5 +6,10 @@
 
 #define BOOST_STACKTRACE_INTERNAL_BUILD_LIBS
 #define BOOST_STACKTRACE_LINK
+
+#ifndef _GNU_SOURCE
+#   define _GNU_SOURCE
+#endif
+
 #include <boost/stacktrace/detail/frame_unwind.ipp>
 #include <boost/stacktrace/safe_dump_to.hpp>