From 3276e16474515736c07c1544a7d47cba0a5c004f Mon Sep 17 00:00:00 2001
From: Jan Maria Matejka <mq@ucw.cz>
Date: Fri, 14 Dec 2018 15:50:44 +0100
Subject: [PATCH] Debug: support for -gdwarf-4 is not available everywhere

---
 configure.ac | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index ae2710f5..4dda60cb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -343,7 +343,10 @@ fi
 if test "$enable_debug" = yes ; then
   AC_DEFINE([DEBUGGING], [1], [Define to 1 if debugging is enabled])
   LDFLAGS="$LDFLAGS -rdynamic"
-  CFLAGS="$CFLAGS -O0 -ggdb -g3 -gdwarf-4"
+  CFLAGS="$CFLAGS -O0 -ggdb -g3"
+
+  BIRD_CHECK_GCC_OPTION([bird_cv_c_option_dwarf4], [-gdwarf-4], [])
+  BIRD_ADD_GCC_OPTION([bird_cv_c_option_dwarf4], [-gdwarf-4])
 
   AC_CHECK_HEADER([execinfo.h],
     [