From 92f75e6004e415b4de1c049fc7c74a3795982b46 Mon Sep 17 00:00:00 2001
From: YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
Date: Mon, 22 Apr 2013 22:20:00 +0900
Subject: [PATCH] deal with platforms where backtrace() is in a different
 library than libc.

execinfo for NetBSD and ubacktrace for uClibc.
i don't know if the latter is relevant to Open vSwitch, though.

Signed-off-by: YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
Signed-off-by: Ben Pfaff <blp@nicira.com>
---
 m4/openvswitch.m4 | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/m4/openvswitch.m4 b/m4/openvswitch.m4
index 1236853f3..ac0c7d5d6 100644
--- a/m4/openvswitch.m4
+++ b/m4/openvswitch.m4
@@ -167,10 +167,9 @@ AC_DEFUN([OVS_CHECK_DBDIR],
      [DBDIR='${sysconfdir}/${PACKAGE}'])
    AC_SUBST([DBDIR])])
 
-dnl Defines HAVE_BACKTRACE if backtrace() is declared in <execinfo.h>
-dnl and exists in libc.
+dnl Defines HAVE_BACKTRACE if backtrace() is found.
 AC_DEFUN([OVS_CHECK_BACKTRACE],
-  [AC_CHECK_HEADER([execinfo.h], [AC_CHECK_FUNCS([backtrace])])])
+  [AC_SEARCH_LIBS([backtrace], [execinfo ubacktrace])])
 
 dnl Checks for __malloc_hook, etc., supported by glibc.
 AC_DEFUN([OVS_CHECK_MALLOC_HOOKS],
-- 
2.43.0