From fbaa2f0b3b73271b692e7dc47cf19df6e05a7eeb Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 18 Aug 2022 11:05:34 +0900
Subject: [PATCH] Suppress detached head warnings [ci skip]

Check out the revisions for testing as "detached" from the beginning.
---
 defs/gmake.mk | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/defs/gmake.mk b/defs/gmake.mk
index 9d055d0f1a..93b7373668 100644
--- a/defs/gmake.mk
+++ b/defs/gmake.mk
@@ -324,7 +324,10 @@ $(srcdir)/gems/src/$(1): | $(srcdir)/gems/src
 
 $(srcdir)/.bundle/gems/$(1)-$(2): | $(srcdir)/gems/src/$(1) .bundle/gems
 	$(ECHO) Copying $(1)@$(3) to $$(@F)
-	$(Q) $(CHDIR) "$(srcdir)/gems/src/$(1)" && $(GIT) fetch origin $(3) && $(GIT) checkout $(3)
+	$(Q) $(CHDIR) "$(srcdir)/gems/src/$(1)" && \
+	    $(GIT) fetch origin $(3) && \
+	    $(GIT) checkout --detach $(3) && \
+	:
 	$(Q) $(BASERUBY) -C "$(srcdir)" \
 	    -Itool/lib -rbundled_gem \
 	    -e 'BundledGem.copy("gems/src/$(1)/$(1).gemspec", ".bundle")'