[openwrt/openwrt] build: permit overwrite PACKAGE_DIR and PACKAGE_DIR_ALL

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/5667b380cd30eeaeb39f0445bcb62b704f2c3223

commit 5667b380cd30eeaeb39f0445bcb62b704f2c3223
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Thu Oct 24 20:13:07 2024 +0200

    build: permit overwrite PACKAGE_DIR and PACKAGE_DIR_ALL
    
    Permit to overwrite PACKAGE_DIR and PACKAGE_DIR_ALL variables in
    rules.mk.
    
    This is to handle a special case with the ImageBuilder where these
    variable are overwrite.
    
    The main problem is that any include calling rules.mk again (example
    image.mk) will set these variables again dropping the modified value.
    
    To keep the modified value, set the PACKAGE_DIR and PACKAGE_DIR_ALL only
    if not already set. This permits the ImageBuilder to use custom
    directory instead of the default one defined in rules.mk.
    
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
 rules.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rules.mk b/rules.mk
index ae20742bd7..973fd1cbb9 100644
--- a/rules.mk
+++ b/rules.mk
@@ -141,8 +141,8 @@ ifeq ($(or $(CONFIG_EXTERNAL_TOOLCHAIN),$(CONFIG_TARGET_uml)),)
   iremap = -f$(if $(CONFIG_REPRODUCIBLE_DEBUG_INFO),file,macro)-prefix-map=$(1)=$(2)
 endif
 
-PACKAGE_DIR:=$(BIN_DIR)/packages
-PACKAGE_DIR_ALL:=$(TOPDIR)/staging_dir/packages/$(BOARD)
+PACKAGE_DIR?=$(BIN_DIR)/packages
+PACKAGE_DIR_ALL?=$(TOPDIR)/staging_dir/packages/$(BOARD)
 BUILD_DIR:=$(BUILD_DIR_BASE)/$(TARGET_DIR_NAME)
 STAGING_DIR:=$(TOPDIR)/staging_dir/$(TARGET_DIR_NAME)
 BUILD_DIR_TOOLCHAIN:=$(BUILD_DIR_BASE)/$(TOOLCHAIN_DIR_NAME)