From ae51f304d28ca8ff3e0680448371c936f10490d0 Mon Sep 17 00:00:00 2001
From: Yuta Saito <kateinoigakukun@gmail.com>
Date: Fri, 7 Jan 2022 00:07:14 +0900
Subject: io_buffer.c: use mremap based resizing only when mremap available

some libc implementations (e.g. wasi-libc) define MREMAP_MAYMOVE, but
don't have mremap itself, so guard the use of mremap by HAVE_MREMAP
---
 io_buffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'io_buffer.c')

diff --git a/io_buffer.c b/io_buffer.c
index 71136d4eb6..fb18e729a6 100644
--- a/io_buffer.c
+++ b/io_buffer.c
@@ -1239,7 +1239,7 @@ rb_io_buffer_resize(VALUE self, size_t size)
         rb_raise(rb_eIOBufferAccessError, "Cannot resize external buffer!");
     }
 
-#ifdef MREMAP_MAYMOVE
+#if defined(HAVE_MREMAP) && defined(MREMAP_MAYMOVE)
     if (data->flags & RB_IO_BUFFER_MAPPED) {
         void *base = mremap(data->base, data->size, size, MREMAP_MAYMOVE);
 
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