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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
set -eu
destdir=${1}
is_enabled() {
grep -q "^$1=y" include/config/auto.conf
}
find_in_scripts() {
find scripts \
\( -name atomic -o -name dtc -o -name kconfig -o -name package \) -prune -o \
! -name unifdef -a ! -name mk_elfconfig -a \( -type f -o -type l \) -print
}
mkdir -p "${destdir}"
(
cd "${srctree}"
echo Makefile
find "arch/${SRCARCH}" -maxdepth 1 -name 'Makefile*'
find "arch/${SRCARCH}" -name generated -prune -o -name include -type d -print
find "arch/${SRCARCH}" -name Kbuild.platforms -o -name Platform
find include \( -name config -o -name generated \) -prune -o \( -type f -o -type l \) -print
find_in_scripts
) | tar -c -f - -C "${srctree}" -T - | tar -xf - -C "${destdir}"
{
if is_enabled CONFIG_OBJTOOL; then
echo tools/objtool/objtool
fi
echo Module.symvers
echo "arch/${SRCARCH}/include/generated"
echo include/config/auto.conf
echo include/config/kernel.release
echo include/generated
find_in_scripts
if is_enabled CONFIG_GCC_PLUGINS; then
find scripts/gcc-plugins -name '*.so'
fi
} | tar -c -f - -T - | tar -xf - -C "${destdir}"
# When ${CC} and ${HOSTCC} differ, we are likely cross-compiling. Rebuild host
# programs using ${CC}. This assumes CC=${CROSS_COMPILE}gcc, which is usually
# the case for package building. It does not cross-compile when CC=clang.
#
# This caters to host programs that participate in Kbuild. objtool and
# resolve_btfids are out of scope.
if [ "${CC}" != "${HOSTCC}" ] && is_enabled CONFIG_CC_CAN_LINK; then
echo "Rebuilding host programs with ${CC}..."
cat <<-'EOF' > "${destdir}/Kbuild"
subdir-y := scripts
EOF
# HOSTCXX is not overridden. The C++ compiler is used to build:
# - scripts/kconfig/qconf, which is unneeded for external module builds
# - GCC plugins, which will not work on the installed system even after
# being rebuilt.
#
# Use the single-target build to avoid the modpost invocation, which
# would overwrite Module.symvers.
"${MAKE}" HOSTCC="${CC}" KBUILD_EXTMOD="${destdir}" scripts/
cat <<-'EOF' > "${destdir}/scripts/Kbuild"
subdir-y := basic
hostprogs-always-y := mod/modpost
mod/modpost-objs := $(addprefix mod/, modpost.o file2alias.o sumversion.o symsearch.o)
EOF
# Run once again to rebuild scripts/basic/ and scripts/mod/modpost.
"${MAKE}" HOSTCC="${CC}" KBUILD_EXTMOD="${destdir}" scripts/
rm -f "${destdir}/Kbuild" "${destdir}/scripts/Kbuild"
fi
find "${destdir}" \( -name '.*.cmd' -o -name '*.o' \) -delete
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