https://git.ruby-lang.org/ruby.git/commit/?id=47d6c55755

From 47d6c55755f28fa83872fd2a3943770e7f788895 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Sat, 23 Jan 2021 10:11:09 +0900
Subject: gc.c: stop overflow check on emscripten build

---
 gc.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/gc.c b/gc.c
index 9dbad18..c6bc641 100644
--- a/gc.c
+++ b/gc.c
@@ -5535,11 +5535,6 @@ init_mark_stack(mark_stack_t *stack) https://github.com/ruby/ruby/blob/trunk/gc.c#L5535
 #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
@@ -5578,7 +5573,7 @@ ruby_stack_length(VALUE **p) https://github.com/ruby/ruby/blob/trunk/gc.c#L5573
 # define PREVENT_STACK_OVERFLOW 0
 #endif
 #endif
-#if PREVENT_STACK_OVERFLOW
+#if PREVENT_STACK_OVERFLOW && !defined(__EMSCRIPTEN__)
 static int
 stack_check(rb_execution_context_t *ec, int water_mark)
 {
-- 
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