From b4b4b9436740997a807f59e0c979520ed4d20311 Mon Sep 17 00:00:00 2001
From: mame <mame@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 15 Feb 2018 01:59:17 +0000
Subject: [PATCH] gc.c: force STACK_GROW_DIRECTION for emscripten

The configure script fails to guess the direction on emscripten.
Perhaps this is because of https://github.com/kripken/emscripten/issues/2093

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62410 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 gc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gc.c b/gc.c
index a1e6bc4bc2..ad4cd55b2a 100644
--- a/gc.c
+++ b/gc.c
@@ -3996,6 +3996,11 @@ init_mark_stack(mark_stack_t *stack)
 #define STACK_END (ec->machine.stack_end)
 #define STACK_LEVEL_MAX (ec->machine.stack_maxsize/sizeof(VALUE))
 
+#ifdef __EMSCRIPTEN__
+#undef STACK_GROW_DIRECTION
+#define STACK_GROW_DIRECTION 1
+#endif
+
 #if STACK_GROW_DIRECTION < 0
 # define STACK_LENGTH  (size_t)(STACK_START - STACK_END)
 #elif STACK_GROW_DIRECTION > 0