bcmkernel: Put libs in separate directory

Install libraries into separate directory (/usr)/lib/broadcom. This is
to enable a clean separation between BCM-SDK-built libraries and
OpenWrt-built built libraries. More importantly, it avoids binary
compatibility issues between the two worlds.

As a side-effect is will also enable future enhancements such as
hardfloat or 64-bit user space on the IOWRT side, which is not supported
in the BCM SDK.

Set the RUNPATH of all the binaries in the OpenWrt Makefile after
stripping, because OpenWrt will remove the RUNPATH during stripping,
otherwise..

Signed-off-by: Andreas Gnau <andreas.gnau@iopsys.eu>

bcmkernel/Makefile

@@ -2,7 +2,7 @@
 # Primary/common bcmkernel makefile for all versions of Broadcom SDKs
 #
 
-PKG_SOURCE_VERSION := c14e656a03c2d3ff5f58b51ba0ffa2244138fcbc
+PKG_SOURCE_VERSION := bd547ddcecdf8b560ae355598200bfe9c14760cd
 BCM_KERNEL_VERSION := 4.19.235
 BRCM_SDK_VERSION   := 504041
 
@@ -112,6 +112,8 @@ define CheckDependencies
 endef
 
 # OpenWRT variables
+# Override OpenWrt stripping: Run OpenWrt stripping but right after set DT_RUNPATH to account load libs from (/usr)/lib/broadcom
+RSTRIP:=$(subst $(SCRIPT_DIR)/rstrip.sh,RSTRIP_SH=$(SCRIPT_DIR)/rstrip.sh $(TOPDIR)/package/feeds/broadcom/bcmkernel/scripts/rstrip_and_set_rpath.sh,$(RSTRIP))
 MAKE_FLAGS += KDIR="$(KDIR)"
 
 # bcmkernel variables

bcmkernel/scripts/rstrip_and_set_rpath.sh

+#!/bin/sh -eux
+"$RSTRIP_SH" "$@"
+# TODO: find out why broadcom wl utility does not run after patching the RUNPATH. Maybe patchelf bug?
+find -D exec \
+	"$@" \
+	-type f \
+	-not -name 'ld-linux*.so*' \
+	-not -name '*.sh' \
+	-not -name wl.brcm \
+	'(' \
+		-name '*.so' \
+		-or \
+		-executable \
+	')' \
+	-execdir "$PATCHELF" --no-default-lib --add-rpath '/${LIB}/broadcom:/usr/${LIB}/broadcom' '{}' ';' || true