build: make <subdir>/install opt-in, use it for target/ only

Fixes buildbot errors on running make target/install or
toolchain/install

Signed-off-by: Felix Fietkau <nbd@nbd.name>

include/subdir.mk

@@ -61,7 +61,7 @@ define subdir
   $(call warn,$(1),d,D $(1))
   $(foreach bd,$($(1)/builddirs),
     $(call warn,$(1),d,BD $(1)/$(bd))
-    $(foreach target,$(SUBTARGETS),
+    $(foreach target,$(SUBTARGETS) $($(1)/subtargets),
       $(foreach btype,$(buildtypes-$(bd)),
         $(call warn_eval,$(1)/$(bd),t,T,$(1)/$(bd)/$(btype)/$(target): $(if $(QUILT),,$($(1)/$(bd)/$(btype)/$(target)) $(call $(1)//$(btype)/$(target),$(1)/$(bd)/$(btype))))
 		  $(call log_make,$(1)/$(bd),$(target),$(btype),$(filter-out __default,$(variant))) \
@@ -81,7 +81,7 @@ define subdir
 	  )
 	)
   )
-  $(foreach target,$(SUBTARGETS),$(call subtarget,$(1),$(target)))
+  $(foreach target,$(SUBTARGETS) $($(1)/subtargets),$(call subtarget,$(1),$(target)))
 endef
 
 ifndef DUMP_TARGET_DB

package/Makefile

@@ -12,7 +12,6 @@ include $(INCLUDE_DIR)/rootfs.mk
 -include $(TMP_DIR)/.packagedeps
 $(curdir)/autoremove:=1
 $(curdir)/builddirs:=$(sort $(package-) $(package-y) $(package-m))
-$(curdir)/builddirs-install:=.
 $(curdir)/builddirs-default:=. $(sort $(package-y) $(package-m))
 $(curdir)/builddirs-prereq:=. $(sort $(prereq-y) $(prereq-m))
 ifdef CHECK_ALL

rules.mk

@@ -101,7 +101,7 @@ ifdef CONFIG_MIPS64_ABI
   endif
 endif
 
-DEFAULT_SUBDIR_TARGETS:=clean download prepare compile install update refresh prereq dist distcheck configure check check-depends
+DEFAULT_SUBDIR_TARGETS:=clean download prepare compile update refresh prereq dist distcheck configure check check-depends
 
 define DefaultTargets
 $(foreach t,$(DEFAULT_SUBDIR_TARGETS) $(1),

target/Makefile

@@ -6,6 +6,7 @@
 #
 curdir:=target
 
+$(curdir)/subtargets:=install
 $(curdir)/builddirs:=linux sdk imagebuilder toolchain
 $(curdir)/builddirs-default:=linux
 $(curdir)/builddirs-install:=linux $(if $(CONFIG_SDK),sdk) $(if $(CONFIG_IB),imagebuilder) $(if $(CONFIG_MAKE_TOOLCHAIN),toolchain)