[source] build: keep recursive dependency check stampfiles up to date

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/d86802acd8ebe0aaf855dc75ad6276856032bfef

commit d86802acd8ebe0aaf855dc75ad6276856032bfef
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Wed Feb 1 14:44:22 2017 +0100

    build: keep recursive dependency check stampfiles up to date
    
    Since the main stamp file depends on the _check stampfile, the _check
    stampfile needs to be created on the first run as well.
    
    Fixes spurious rebuilds with CONFIG_AUTOREBUILD=y
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 include/package.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/package.mk b/include/package.mk
index 91871f0..ce1aa25 100644
--- a/include/package.mk
+++ b/include/package.mk
@@ -156,6 +156,7 @@ define Build/CoreTargets
   $(STAMP_PREPARED): $(STAMP_PREPARED_DEPENDS)
 	@-rm -rf $(PKG_BUILD_DIR)
 	@mkdir -p $(PKG_BUILD_DIR)
+	touch $$@_check
 	$(foreach hook,$(Hooks/Prepare/Pre),$(call $(hook))$(sep))
 	$(Build/Prepare)
 	$(foreach hook,$(Hooks/Prepare/Post),$(call $(hook))$(sep))
@@ -172,6 +173,8 @@ define Build/CoreTargets
 
   $(call Build/Exports,$(STAMP_BUILT))
   $(STAMP_BUILT): $(STAMP_CONFIGURED) $(STAMP_BUILT_DEPENDS)
+	rm -f $$@
+	touch $$@_check
 	$(foreach hook,$(Hooks/Compile/Pre),$(call $(hook))$(sep))
 	$(Build/Compile)
 	$(foreach hook,$(Hooks/Compile/Post),$(call $(hook))$(sep))