https://git.ruby-lang.org/ruby.git/commit/?id=8a677a6e80

From 8a677a6e80b3b7e1f52073b362083a78eb87397f Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Sun, 1 Dec 2019 01:35:30 -0800
Subject: Workaround missing strndup on Windows

https://ci.appveyor.com/project/ruby/ruby/builds/29230976/job/c910t37313edb97k

diff --git a/mjit.c b/mjit.c
index 5749f21..f062b4b 100644
--- a/mjit.c
+++ b/mjit.c
@@ -700,6 +700,16 @@ start_worker(void) https://github.com/ruby/ruby/blob/trunk/mjit.c#L700
     return true;
 }
 
+// There's no strndup on Windows
+static char*
+ruby_strndup(char *str, size_t n)
+{
+    char *ret = xmalloc(n + 1);
+    memcpy(ret, str, n);
+    ret[n] = '\0';
+    return ret;
+}
+
 // Convert "foo bar" to {"foo", "bar", NULL} array. Caller is responsible for
 // freeing a returned buffer and its elements.
 static char **
@@ -716,7 +726,7 @@ split_flags(char *flags) https://github.com/ruby/ruby/blob/trunk/mjit.c#L726
         }
         else {
             if (next > flags)
-                buf[i++] = strndup(flags, next - flags);
+                buf[i++] = ruby_strndup(flags, next - flags);
             next++; // skip space
         }
     }
-- 
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