From f63697432e6214e4be3c38648d71ccffaa0c7545 Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 1 Sep 2018 02:03:24 +0000
Subject: merge revision(s) 63994: [Backport #14920]

	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/branches/ruby_2_5@64602 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 time.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'time.c')

diff --git a/time.c b/time.c
index e0a95097bd..672a794efe 100644
--- a/time.c
+++ b/time.c
@@ -646,12 +646,18 @@ static struct vtm *localtimew(wideval_t timew, struct vtm *result);
 static int leap_year_p(long y);
 #define leap_year_v_p(y) leap_year_p(NUM2LONG(modv((y), INT2FIX(400))))
 
+int ruby_tz_update;
+
 static struct tm *
 rb_localtime_r(const time_t *t, struct tm *result)
 {
 #if defined __APPLE__ && defined __LP64__
     if (*t != (time_t)(int)*t) return NULL;
 #endif
+    if (!ruby_tz_update) {
+	ruby_tz_update = 1;
+	tzset();
+    }
 #ifdef HAVE_GMTIME_R
     result = localtime_r(t, result);
 #else
@@ -677,7 +683,7 @@ rb_localtime_r(const time_t *t, struct tm *result)
 #endif
     return result;
 }
-#define LOCALTIME(tm, result) (tzset(),rb_localtime_r((tm), &(result)))
+#define LOCALTIME(tm, result) rb_localtime_r((tm), &(result))
 
 #ifndef HAVE_STRUCT_TM_TM_GMTOFF
 static struct tm *
-- 
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