From 12eb0df4d55e4ce1cd0cfafab72706accf9fa5ba Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 10 Feb 2016 03:03:57 +0000
Subject: check ar D flag

* configure.in (ARFLAGS): check if deterministic mode flag is
  effective, which is on by default on Ubuntu.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53798 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog    | 5 +++++
 Makefile.in  | 2 +-
 configure.in | 6 ++++++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 8e0ccd66a3..5749af7e08 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Feb 10 12:03:41 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (ARFLAGS): check if deterministic mode flag is
+	  effective, which is on by default on Ubuntu.
+
 Tue Feb  9 16:36:23 2016  Naotoshi Seo  <sonots@gmail.com>
 
 	* lib/logger.rb: Remove block from Logger.add as it's not needed
diff --git a/Makefile.in b/Makefile.in
index 17164cb25b..4f5c58baad 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -165,7 +165,7 @@ RMDIRS        = @RMDIRS@
 RMALL         = @RMALL@
 NM            = @NM@
 AR            = @AR@
-ARFLAGS       = rcu
+ARFLAGS       = @ARFLAGS@
 RANLIB        = @RANLIB@
 AS            = @AS@
 ASFLAGS       = @ASFLAGS@ $(INCFLAGS)
diff --git a/configure.in b/configure.in
index 040484b5ab..dba9d4a097 100644
--- a/configure.in
+++ b/configure.in
@@ -567,6 +567,12 @@ AC_CHECK_TOOL(AR, ar)
 if test -z "$AR"; then
   AC_CHECK_PROGS(AR, aal, ar)
 fi
+AC_CACHE_CHECK([for $AR D option], [rb_cv_ar_D_option], [
+    AS_IF([$AR rcD conftest.a > /dev/null 2>&1 && rm conftest.a],
+	[rb_cv_ar_D_option=yes], [rb_cv_ar_D_option=no])
+])
+AS_IF([test "$rb_cv_ar_D_option" = yes], [ARFLAGS=rcD], [ARFLAGS=rcu])
+AC_SUBST(ARFLAGS)
 
 AC_CHECK_TOOL(AS, as)
 ASFLAGS=$ASFLAGS
-- 
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