Move gc_impl.c to gc/gc_impl.c

This commit creates a new directory `gc` to put different GC
implementations and moves the default GC from gc_impl.c to gc/gc_impl.c.
The default GC can be easily switched using the `BUILTIN_GC` variable
in Makefile.in.

common.mk

@@ -1915,7 +1915,7 @@ shared-gc: probes.h
 		exit 1; \
 	else \
 		echo generating $(shared_gc_dir)librubygc.$(SHARED_GC).$(SOEXT); \
-		$(LDSHARED) -I$(srcdir)/include -I$(srcdir) -I$(arch_hdrdir) -I. $(XDLDFLAGS) $(cflags) -fPIC -o $(shared_gc_dir)librubygc.$(SHARED_GC).$(SOEXT) $(srcdir)/$(SHARED_GC).c; \
+		$(LDSHARED) -I$(srcdir)/include -I$(srcdir) -I$(arch_hdrdir) -I. $(XDLDFLAGS) $(cflags) -fPIC -o $(shared_gc_dir)librubygc.$(SHARED_GC).$(SOEXT) $(srcdir)/gc/$(SHARED_GC).c; \
 	fi
 
 help: PHONY
@@ -7506,6 +7506,7 @@ gc_impl.$(OBJEXT): $(CCAN_DIR)/container_of/container_of.h
 gc_impl.$(OBJEXT): $(CCAN_DIR)/list/list.h
 gc_impl.$(OBJEXT): $(CCAN_DIR)/str/str.h
 gc_impl.$(OBJEXT): $(hdrdir)/ruby/ruby.h
+gc_impl.$(OBJEXT): $(top_srcdir)/gc/gc_impl.c
 gc_impl.$(OBJEXT): $(top_srcdir)/internal/bits.h
 gc_impl.$(OBJEXT): $(top_srcdir)/internal/compilers.h
 gc_impl.$(OBJEXT): $(top_srcdir)/internal/sanitizers.h
@@ -7527,7 +7528,7 @@ gc_impl.$(OBJEXT): {$(VPATH)}darray.h
 gc_impl.$(OBJEXT): {$(VPATH)}debug.h
 gc_impl.$(OBJEXT): {$(VPATH)}debug_counter.h
 gc_impl.$(OBJEXT): {$(VPATH)}defines.h
-gc_impl.$(OBJEXT): {$(VPATH)}gc_impl.c
+gc_impl.$(OBJEXT): {$(VPATH)}gc/gc_impl.c
 gc_impl.$(OBJEXT): {$(VPATH)}intern.h
 gc_impl.$(OBJEXT): {$(VPATH)}internal/abi.h
 gc_impl.$(OBJEXT): {$(VPATH)}internal/anyargs.h

template/Makefile.in

@@ -67,6 +67,7 @@ RUBY_VERSION_NAME = @RUBY_VERSION_NAME@
 UNIVERSAL_ARCHNAMES = @UNIVERSAL_ARCHNAMES@
 BUILTIN_BINARY = @X_BUILTIN_BINARY@
 
+BUILTIN_GC = gc_impl
 shared_gc_dir = @shared_gc_dir@
 
 TESTUI = console
@@ -444,6 +445,10 @@ $(srcdir)/enc/jis/props.h: enc/jis/props.kwd
 	  $(CP) $@ $(?:.kwd=.h.blt); \
 	fi
 
+gc_impl.$(OBJEXT): gc/$(BUILTIN_GC).c probes.h
+	@$(ECHO) compiling $<
+	$(Q) $(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) $(COUTFLAG)$@ -c $<
+
 .c.$(OBJEXT):
 	@$(ECHO) compiling $<
 	$(Q) $(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) $(COUTFLAG)$@ -c $<

win32/Makefile.sub

@@ -443,6 +443,8 @@ PREP          = miniruby$(EXEEXT)
 BUILTIN_BINARY = yes
 !endif
 
+BUILTIN_GC = default
+
 !if !defined(EXTSTATIC)
 EXTSTATIC     =
 !endif
@@ -1336,6 +1338,11 @@ $(ruby_pc): $(RBCONFIG)
 	$(ECHO) compiling $(<:\=/)
 	$(Q) $(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) $(COUTFLAG)$@ -c $(CSRCFLAG)$(<:\=/)
 
+BUILTIN_GC_PATH = $(srcdir)/gc/$(BUILTIN_GC).c
+gc_impl.obj: $(BUILTIN_GC_PATH)
+	$(ECHO) compiling $(BUILTIN_GC_PATH:\=/)
+	$(Q) $(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) $(COUTFLAG)$@ -c $(CSRCFLAG)$(BUILTIN_GC_PATH:\=/)
+
 {$(srcdir)/missing}.c.asm:
 	$(ECHO) translating $(<:\=/)
 	$(Q) $(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) -Fa$@ -c $(CSRCFLAG)$(<:\=/)