From b4b3ecd65b04a6f653b51739b9dd25e5600c4f64 Mon Sep 17 00:00:00 2001
From: Julian Brost <julian.brost@icinga.com>
Date: Wed, 28 Oct 2020 10:26:39 +0100
Subject: [PATCH] Compile with -D_GNU_SOURCE

Needed by `boost::stacktrace` for `_Unwind_Backtrace()`.
---
 CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 41e63a215..0b39e0097 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -361,9 +361,13 @@ if(HAVE_LIBEXECINFO)
   list(APPEND base_DEPS execinfo)
 endif()
 
+if(NOT WIN32)
+  # boost::stacktrace uses _Unwind_Backtrace which is only exposed if _GNU_SOURCE is defined on most systems
+  add_definitions(-D_GNU_SOURCE)
+endif()
+
 if(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
   set(ICINGA2_STACKTRACE_USE_BACKTRACE_SYMBOLS TRUE)
-  add_definitions(-D_GNU_SOURCE)
 endif()
 
 if(ICINGA2_STACKTRACE_USE_BACKTRACE_SYMBOLS AND NOT HAVE_BACKTRACE_SYMBOLS)