[source] build: allow PKG_PREPARED_DEPENDS and PKG_CONFIG_DEPENDS to be changed after including package.mk

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/905bbc96efdef696c33d8a8bc202a7a35fe7fe35

commit 905bbc96efdef696c33d8a8bc202a7a35fe7fe35
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Tue Dec 12 12:20:56 2017 +0100

    build: allow PKG_PREPARED_DEPENDS and PKG_CONFIG_DEPENDS to be changed after including package.mk
    
    Reverts commit a9c96ef0ac7ac99e4928f5312f3d0d1252c98328 and replaces it
    with a different approach
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 include/host-build.mk | 2 +-
 include/package.mk    | 7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/host-build.mk b/include/host-build.mk
index 113e269..9120570 100644
--- a/include/host-build.mk
+++ b/include/host-build.mk
@@ -24,7 +24,7 @@ include $(INCLUDE_DIR)/depends.mk
 include $(INCLUDE_DIR)/quilt.mk
 
 BUILD_TYPES += host
-HOST_STAMP_PREPARED:=$(HOST_BUILD_DIR)/.prepared$(if $(HOST_QUILT)$(DUMP),,$(shell $(call find_md5,${CURDIR} $(PKG_FILE_DEPENDS),))_$(call confvar,CONFIG_AUTOREMOVE $(HOST_PREPARED_DEPENDS)))
+HOST_STAMP_PREPARED=$(HOST_BUILD_DIR)/.prepared$(if $(HOST_QUILT)$(DUMP),,$(shell $(call find_md5,${CURDIR} $(PKG_FILE_DEPENDS),))_$(call confvar,CONFIG_AUTOREMOVE $(HOST_PREPARED_DEPENDS)))
 HOST_STAMP_CONFIGURED:=$(HOST_BUILD_DIR)/.configured
 HOST_STAMP_BUILT:=$(HOST_BUILD_DIR)/.built
 HOST_BUILD_PREFIX?=$(if $(IS_PACKAGE_BUILD),$(STAGING_DIR_HOSTPKG),$(STAGING_DIR_HOST))
diff --git a/include/package.mk b/include/package.mk
index 5dc4aec..e804b02 100644
--- a/include/package.mk
+++ b/include/package.mk
@@ -69,9 +69,9 @@ ifneq ($(PREV_STAMP_PREPARED),)
   STAMP_PREPARED:=$(PREV_STAMP_PREPARED)
   CONFIG_AUTOREBUILD:=
 else
-  STAMP_PREPARED:=$(PKG_BUILD_DIR)/.prepared$(if $(QUILT)$(DUMP),,_$(shell $(call find_md5,${CURDIR} $(PKG_FILE_DEPENDS),))_$(call confvar,CONFIG_AUTOREMOVE $(PKG_PREPARED_DEPENDS)))
+  STAMP_PREPARED=$(PKG_BUILD_DIR)/.prepared$(if $(QUILT)$(DUMP),,_$(shell $(call find_md5,${CURDIR} $(PKG_FILE_DEPENDS),))_$(call confvar,CONFIG_AUTOREMOVE $(PKG_PREPARED_DEPENDS)))
 endif
-STAMP_CONFIGURED:=$(PKG_BUILD_DIR)/.configured$(if $(DUMP),,_$(call confvar,$(PKG_CONFIG_DEPENDS)))
+STAMP_CONFIGURED=$(PKG_BUILD_DIR)/.configured$(if $(DUMP),,_$(call confvar,$(PKG_CONFIG_DEPENDS)))
 STAMP_CONFIGURED_WILDCARD=$(PKG_BUILD_DIR)/.configured_*
 STAMP_BUILT:=$(PKG_BUILD_DIR)/.built
 STAMP_INSTALLED:=$(STAGING_DIR)/stamp/.$(PKG_DIR_NAME)$(if $(BUILD_VARIANT),.$(BUILD_VARIANT),)_installed
@@ -144,6 +144,9 @@ endef
 Build/Exports=$(Build/Exports/Default)
 
 define Build/CoreTargets
+  STAMP_PREPARED:=$$(STAMP_PREPARED)
+  STAMP_CONFIGURED:=$$(STAMP_CONFIGURED)
+
   $(if $(QUILT),$(Build/Quilt))
   $(call Build/Autoclean)
   $(call DefaultTargets)