From c70b1a9a29a0edd25fe17ef0374635da71310076 Mon Sep 17 00:00:00 2001
From: Michael Davidsaver <mdavidsaver@gmail.com>
Date: Sat, 6 Jul 2019 13:43:58 -0700
Subject: [PATCH] libcom: detect uclibc support for backtrace()

---
 .../src/osi/os/posix/osdExecinfoBackTrace.cpp  | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/modules/libcom/src/osi/os/posix/osdExecinfoBackTrace.cpp b/modules/libcom/src/osi/os/posix/osdExecinfoBackTrace.cpp
index ae13d28fc..8ed1bb283 100644
--- a/modules/libcom/src/osi/os/posix/osdExecinfoBackTrace.cpp
+++ b/modules/libcom/src/osi/os/posix/osdExecinfoBackTrace.cpp
@@ -7,12 +7,30 @@
  * Author: Till Straumann <strauman@slac.stanford.edu>, 2011, 2014
  */ 
 
+// pull in libc feature test macros
+#include <stdlib.h>
+
+// execinfo.h may not be present if uclibc is configured to omit backtrace()
+#if !defined(__UCLIBC_MAJOR__) || defined(__UCLIBC_HAS_EXECINFO__)
+#  define HAS_EXECINFO 1
+#else
+#  define HAS_EXECINFO 0
+#endif
+
+#if HAS_EXECINFO
+
 #include <execinfo.h>
 
+#endif
+
 #define epicsExportSharedSymbols
 #include "epicsStackTracePvt.h"
 
 int epicsBackTrace(void **buf, int buf_sz)
 {
+#if HAS_EXECINFO
 	return backtrace(buf, buf_sz);
+#else
+	return -1;
+#endif
 }