From 2fc56c986a17222993880320902efea5ed397ff3 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 29 Nov 2018 07:45:54 +0000
Subject: [PATCH] Create empty revision.h when srcdir is write-only [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66090 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 common.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/common.mk b/common.mk
index a4559a7087..97b567cecc 100644
--- a/common.mk
+++ b/common.mk
@@ -1083,7 +1083,8 @@ preludes: {$(VPATH)}miniprelude.c
 preludes: {$(srcdir)}golf_prelude.c
 
 $(srcdir)/revision.h:
-	$(Q)$(gnumake:yes=#) exit > $@
+	$(Q)$(gnumake:yes=#) $(RM) $(@F)
+	$(Q)$(gnumake:yes=#) exit > $@ || exit > $(@F)
 
 $(REVISION_H): $(srcdir)/version.h $(srcdir)/tool/file2lastrev.rb $(REVISION_FORCE)
 	-$(Q) $(BASERUBY) $(srcdir)/tool/file2lastrev.rb -q --revision.h "$(srcdir)" > revision.tmp