From 303dd29b501d9f27b60d1b400986f04b99df2453 Mon Sep 17 00:00:00 2001
From: Jeff Lucovsky <jeff@lucovsky.org>
Date: Thu, 17 Jun 2021 08:52:17 -0400
Subject: [PATCH] configure.ac: Support libunwind configuration

This commit adds support for enabling libunwind -- a library that can be
used to display stack information.

Libunwind is enabled and used by Suricata if present during
configuration.  A diagnostic message is displayed if libunwind
cannot be found.
---
 configure.ac | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/configure.ac b/configure.ac
index 037adda170..c5aeac4fe1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1626,6 +1626,13 @@
     ;;
     esac
 
+    AC_CHECK_LIB(unwind,unw_backtrace,,LIBUNW="no")
+    if test "$LIBUNW" = "no"; then
+        echo
+        echo "   libunwind library and development headers not found"
+        echo "   stacktrace on unexpected termination due to signal not possible"
+        echo
+    fi;
 
     AC_ARG_ENABLE(ebpf,
 	        AS_HELP_STRING([--enable-ebpf],[Enable eBPF support]),
-- 
2.47.2