https://git.ruby-lang.org/ruby.git/commit/?id=229cbeba8c

From 229cbeba8c928dc6ee5eb21951e00c43a6e5225c Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@g...>
Date: Thu, 29 Apr 2021 14:29:57 +0200
Subject: Fix -Wundef warnings in coroutine/*/Context.h

* See [Feature #17752]

Co-authored-by: xtkoba (Tee KOBAYASHI) <xtkoba+ruby@g...>
---
 coroutine/copy/Context.h     | 3 +++
 coroutine/ucontext/Context.h | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/coroutine/copy/Context.h b/coroutine/copy/Context.h
index db13604..2cb2bc1 100644
--- a/coroutine/copy/Context.h
+++ b/coroutine/copy/Context.h
@@ -23,9 +23,12 @@ https://github.com/ruby/ruby/blob/trunk/coroutine/copy/Context.h#L23
 
 #define COROUTINE __attribute__((noreturn)) void
 
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
 #if INTPTR_MAX <= INT32_MAX
 #define COROUTINE_LIMITED_ADDRESS_SPACE
 #endif
+#endif
 
 // This stack copying implementation which uses a private stack for each coroutine, including the main one.
 #define COROUTINE_PRIVATE_STACK
diff --git a/coroutine/ucontext/Context.h b/coroutine/ucontext/Context.h
index 7971086..39d7ca7 100644
--- a/coroutine/ucontext/Context.h
+++ b/coroutine/ucontext/Context.h
@@ -16,9 +16,12 @@ https://github.com/ruby/ruby/blob/trunk/coroutine/ucontext/Context.h#L16
 
 #define COROUTINE __attribute__((noreturn)) void
 
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
 #if INTPTR_MAX <= INT32_MAX
 #define COROUTINE_LIMITED_ADDRESS_SPACE
 #endif
+#endif
 
 struct coroutine_context
 {
-- 
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