From e6520de3442659def3463d3bfdca3432f41b2d6a Mon Sep 17 00:00:00 2001
From: Mike Dalessio <mike@37signals.com>
Date: Wed, 17 Dec 2025 17:28:47 -0500
Subject: [PATCH] [Bug #21792] Build rubyspec-capiext only when excuting
 `test-spec`

rubyspec-capiext is only needed for running specs, not for building or
installing Ruby.
---
 common.mk          | 3 ++-
 defs/gmake.mk      | 6 +-----
 win32/Makefile.sub | 2 --
 3 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/common.mk b/common.mk
index c0d663f68e..08fee9119a 100644
--- a/common.mk
+++ b/common.mk
@@ -804,6 +804,7 @@ clean-platform distclean-platform realclean-platform:
 RUBYSPEC_CAPIEXT = spec/ruby/optional/capi/ext
 RUBYSPEC_CAPIEXT_SRCDIR = $(srcdir)/$(RUBYSPEC_CAPIEXT)
 RUBYSPEC_CAPIEXT_DEPS = $(RUBYSPEC_CAPIEXT_SRCDIR)/rubyspec.h $(RUBY_H_INCLUDES) $(LIBRUBY)
+RUBYSPEC_CAPIEXT_BUILD = $(enable_shared:yes=rubyspec-capiext)
 
 rubyspec-capiext: build-ext $(DOT_WAIT)
 # make-dependent rules should be included after this and built after build-ext.
@@ -905,7 +906,7 @@ test: test-short
 
 # Separate to skip updating encs and exts by `make -o test-precheck`
 # for GNU make.
-test-precheck: $(ENCSTATIC:static=lib)encs exts PHONY $(DOT_WAIT)
+test-precheck: $(ENCSTATIC:static=lib)encs $(RUBYSPEC_CAPIEXT_BUILD) exts PHONY $(DOT_WAIT)
 yes-test-all-precheck: programs $(DOT_WAIT) test-precheck
 
 PRECHECK_TEST_ALL = yes-test-all-precheck
diff --git a/defs/gmake.mk b/defs/gmake.mk
index 2422151009..e6f553fa8c 100644
--- a/defs/gmake.mk
+++ b/defs/gmake.mk
@@ -529,11 +529,7 @@ RUBYSPEC_CAPIEXT_SO := $(patsubst %.c,$(RUBYSPEC_CAPIEXT)/%.$(DLEXT),$(notdir $(
 rubyspec-capiext: $(RUBYSPEC_CAPIEXT_SO)
 	@ $(NULLCMD)
 
-ifeq ($(ENABLE_SHARED),yes)
-exts: rubyspec-capiext
-endif
-
-spec/%/ spec/%_spec.rb: programs exts PHONY
+spec/%/ spec/%_spec.rb: programs exts $(RUBYSPEC_CAPIEXT_BUILD) PHONY
 	+$(RUNRUBY) -r./$(arch)-fake $(srcdir)/spec/mspec/bin/mspec-run -B $(srcdir)/spec/default.mspec $(SPECOPTS) $(patsubst %,$(srcdir)/%,$@)
 
 ruby.pc: $(filter-out ruby.pc,$(ruby_pc))
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index c3db450abc..80f8f5c2bf 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -1425,8 +1425,6 @@ rubyspec-capiext: $(RUBYSPEC_CAPIEXT_EXTS)
 	$(Q)$(LDSHARED) -Fe$(@) -Fo$(*).obj $(INCFLAGS) $(CFLAGS) $(CPPFLAGS) $< $(LIBRUBYARG) -link $(DLDFLAGS) $(XLDFLAGS) $(LIBS) $(LOCAL_LIBS) -implib:$*.lib -pdb:$*.pdb -def:$*.def
 	$(Q)$(RM) $*.def $*.exp $*.lib $*.obj $*.pdb
 
-exts: rubyspec-capiext
-
 yesterday:
 	(set TZ=UTC-9) && \
 	for /f "usebackq" %H in \