From bd62a076c66e844768a4292ab8961fee25987b27 Mon Sep 17 00:00:00 2001
From: Donaim <3Donaim@gmail.com>
Date: Wed, 13 May 2020 22:14:09 +0200
Subject: [PATCH] Avoid undefined C macro behavior

MacOS and clang compilers complain about undefined behavior
in C macro.
Rewrite macro to solve that.

Fixes issue #638
---
 include/chibi/features.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/chibi/features.h b/include/chibi/features.h
index 2755d76b..8b486c9d 100644
--- a/include/chibi/features.h
+++ b/include/chibi/features.h
@@ -451,7 +451,11 @@
 #endif
 
 #ifndef SEXP_USE_TIME_GC
-#define SEXP_USE_TIME_GC (SEXP_USE_DEBUG_GC > 0 || defined(__linux) || SEXP_BSD)
+#if SEXP_USE_DEBUG_GC > 0 || defined(__linux) || SEXP_BSD
+#define SEXP_USE_TIME_GC 1
+#else
+#define SEXP_USE_TIME_GC 0
+#endif
 #endif
 
 #ifndef SEXP_USE_SAFE_GC_MARK