From 4bc16691279e98ecdb3e19ff23902be671d46307 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 18 Jul 2018 10:30:41 +0000
Subject: reduce tzset

* time.c (rb_localtime_r): call tzset() only after TZ environment
  variable is changed.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63994 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 hash.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'hash.c')

diff --git a/hash.c b/hash.c
index c9d60c7a56..1b3fde2de2 100644
--- a/hash.c
+++ b/hash.c
@@ -3315,6 +3315,9 @@ env_str_new2(const char *ptr)
 
 static int env_path_tainted(const char *);
 
+static const char TZ_ENV[] = "TZ";
+extern int ruby_tz_update;
+
 static rb_encoding *
 env_encoding_for(const char *name, const char *ptr)
 {
@@ -3396,6 +3399,9 @@ env_delete(VALUE obj, VALUE name)
 	    RB_GC_GUARD(name);
 	    path_tainted = 0;
 	}
+	else if (ENVMATCH(nam, TZ_ENV)) {
+	    ruby_tz_update = 0;
+	}
 	return value;
     }
     return Qnil;
@@ -3755,6 +3761,9 @@ env_aset(VALUE obj, VALUE nm, VALUE val)
 	    path_tainted_p(value);
 	}
     }
+    else if (ENVMATCH(name, TZ_ENV)) {
+	ruby_tz_update = 0;
+    }
     return val;
 }
 
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