The code to find OVERLAY_MAKEFILE_APPENDS for each package took
about 0.3 seconds which can create a big overhad during
"./scripts/feeds update" processing, where OpenWrt process each
package that exists in all feeds, not only packages targeted for
installation.
To reduce processing time we will re-use the
"$(TMP_DIR)/info/.files-packageinfo-$(SCAN_COOKIE)" file that
created on each run of "make" in OpenWrt root directory and,
after the 1ff5427954 commit,
contains list of all relevant Makefile.append files.
In cases when this file missed, the plain search implementation
would be used to get list of Makefile.append's.
References: PPW-1162
Signed-off-by: Nikolai Merinov <n.merinov@inango-systems.com>
d9a1ec74d5
