[openwrt/openwrt] target.mk: add support to early scan of default package configuration

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/98703bf45833b915a0b835ae7ab7d419244a8840

commit 98703bf45833b915a0b835ae7ab7d419244a8840
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Fri May 24 12:49:15 2024 +0200

    target.mk: add support to early scan of default package configuration
    
    There is currently a problem with how some option that modify default
    package configuration are parsed.
    
    When the DEFAULT_PACKAGES list is composed, DUMP is used. Using DUMP
    disable the loading of .config to remove and modification done by the
    user to prevent any kind of conflict or strange thing one creating all
    the info for each target. Because of this, .config is never parsed and
    any check to CONFIG doesn't work (for the first creation of .config).
    
    Later image build will check what is set in .config and the default
    package list won't be parsed anymore.
    
    This is problematic for some config that are OK to parse, for example
    SELINUX or USE_APK.
    
    To better handle them add some logic when DUMP is used to selectively
    parse these option if present in a to-be-init .config so that option are
    correctly parsed and DEFAULT_PACKAGES is correctly set.
    
    Link: https://github.com/openwrt/openwrt/pull/15543
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
 include/target.mk | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/target.mk b/include/target.mk
index e2274171a9..df34f937d3 100644
--- a/include/target.mk
+++ b/include/target.mk
@@ -6,6 +6,15 @@
 ifneq ($(__target_inc),1)
 __target_inc=1
 
+ifneq ($(DUMP),)
+  # Parse generic config that might be set before a .config is generated to modify the
+  # default package configuration
+  GENERIC_CONFIG := CONFIG_USE_APK CONFIG_SELINUX CONFIG_SMALL_FLASH CONFIG_SECCOMP
+  $(foreach config, $(GENERIC_CONFIG), \
+    $(eval $(config) := $(shell grep "$(config)=y" $(TOPDIR)/.config 2>/dev/null)) \
+  )
+endif
+
 # default device type
 DEVICE_TYPE?=router
 
@@ -26,7 +35,7 @@ DEFAULT_PACKAGES:=\
 	urandom-seed \
 	urngd
 
-ifdef CONFIG_USE_APK
+ifneq ($(CONFIG_USE_APK),)
 DEFAULT_PACKAGES+=apk-mbedtls
 else
 DEFAULT_PACKAGES+=opkg