From 6dad94c5e5f7e7ab396396892cbe26c15c480694 Mon Sep 17 00:00:00 2001
From: Mark Pizzolato <mark@infocomm.com>
Date: Tue, 7 Aug 2018 23:24:49 -0700
Subject: [PATCH] makefile: Disable optimization on OS X compiling with clang

The VAX simulator is counting on undefined C language behaviors
which allow the optimizer to correctly produce unexpected results.
Hopefully this will be sufficient until the VAX architecture verifier
(AXE) can be found to validate a rewritten simulator.

As reported in #598
---
 makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/makefile b/makefile
index 465c46d4..a79f2b04 100644
--- a/makefile
+++ b/makefile
@@ -1042,7 +1042,7 @@ ifneq ($(DEBUG),)
   BUILD_FEATURES = - debugging support
 else
   ifneq (clang,$(findstring clang,$(COMPILER_NAME)))
-    CFLAGS_O = -O2
+    CFLAGS_O = -O0
     ifeq (Darwin,$(OSTYPE))
       NO_LTO = 1
     endif