From 8d054a5530defa35ad9a337c23968f8bdef9a6c7 Mon Sep 17 00:00:00 2001
From: Richard Levitte <levitte@openssl.org>
Date: Thu, 2 Jun 2016 12:14:52 +0200
Subject: [PATCH] Add a warning about using enable-crypto-mdebug-backtrace

Reviewed-by: Matt Caswell <matt@openssl.org>
---
 INSTALL | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/INSTALL b/INSTALL
index ab35353bdd..901a5c094b 100644
--- a/INSTALL
+++ b/INSTALL
@@ -147,6 +147,13 @@
   enable-crypto-mdebug-backtrace
                    As for crypto-mdebug, but additionally provide backtrace
                    information for allocated memory.
+                   TO BE USED WITH CARE: this uses GNU C functionality, and
+                   is therefore not usable for non-GNU config targets.  If
+                   your build complains about the use of '-rdynamic' or the
+                   lack of header file execinfo.h, this option is not for you.
+                   ALSO NOTE that even though execinfo.h is available on your
+                   system (through Gnulib), the functions might just be stubs
+                   that do nothing.
 
   no-ct
                    Don't build support for Certificate Transparency.