From 34e1079aef81d108890fb167d7df69960e994ff5 Mon Sep 17 00:00:00 2001
From: "Urabe, Shyouhei" <shyouhei@ruby-lang.org>
Date: Fri, 26 Apr 2019 18:37:21 +0900
Subject: [PATCH] glibc says memcpy cannot take NULL

At least since 2004, glibc's <string.h> annotates memcpy as
__attribute__((__nonnull__)).  This basedir is passed to it.  When
LOAD_RELATIVE is not defined and MJIT_SEARCH_BUILD_DIR is not set,
this variable is never updated.  Should initialize with meaningful
default value.
---
 mjit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mjit.c b/mjit.c
index 4d0819153d..a4550e922c 100644
--- a/mjit.c
+++ b/mjit.c
@@ -469,7 +469,7 @@ init_header_filename(void)
     // Root path of the running ruby process. Equal to RbConfig::TOPDIR.
     VALUE basedir_val;
 #endif
-    const char *basedir = NULL;
+    const char *basedir = "";
     size_t baselen = 0;
     char *p;
 #ifdef _WIN32