kbuild: deb-pkg: squash scripts/package/deb-build-option to debian/rules

The binary-arch target needs to use the same CROSS_COMPILE as used in
build-arch; otherwise, 'make run-command' may attempt to resync the
.config file.

Squash scripts/package/deb-build-option into debian/rules, as it is a
small amount of code.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <n.schier@avm.de>

scripts/package/deb-build-option

-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0-only
-
-# Set up CROSS_COMPILE if not defined yet
-if [ "${CROSS_COMPILE+set}" != "set" -a "${DEB_HOST_ARCH}" != "${DEB_BUILD_ARCH}" ]; then
-	echo CROSS_COMPILE=${DEB_HOST_GNU_TYPE}-
-fi
-
-version=$(dpkg-parsechangelog -S Version)
-debian_revision="${version##*-}"
-
-if [ "${version}" != "${debian_revision}" ]; then
-	echo KBUILD_BUILD_VERSION=${debian_revision}
-fi

scripts/package/debian/rules

@@ -10,7 +10,9 @@ ifneq (,$(filter-out parallel=1,$(filter parallel=%,$(DEB_BUILD_OPTIONS))))
     MAKEFLAGS += -j$(NUMJOBS)
 endif
 
-make-opts = ARCH=$(ARCH) KERNELRELEASE=$(KERNELRELEASE)
+revision = $(lastword $(subst -, ,$(shell dpkg-parsechangelog -S Version)))
+CROSS_COMPILE ?= $(filter-out $(DEB_BUILD_GNU_TYPE)-, $(DEB_HOST_GNU_TYPE)-)
+make-opts = ARCH=$(ARCH) KERNELRELEASE=$(KERNELRELEASE) KBUILD_BUILD_VERSION=$(revision) $(addprefix CROSS_COMPILE=,$(CROSS_COMPILE))
 
 .PHONY: binary binary-indep binary-arch
 binary: binary-arch binary-indep
@@ -24,7 +26,6 @@ build: build-arch build-indep
 build-indep:
 build-arch:
 	$(MAKE) -f $(srctree)/Makefile $(make-opts) \
-	$(shell $(srctree)/scripts/package/deb-build-option) \
 	olddefconfig all
 
 .PHONY: clean