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# Copyright (C) 2019 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# This is an implementation detail of build.sh and friends. Do not source
# directly as it will spoil your shell and make build.sh unusable. You have
# been warned! If you have a good reason to source the result of this file into
# a shell, please let kernel-team@android.com know and we are happy to help
# with your use case.
[ -n "$_SETUP_ENV_SH_INCLUDED" ] && return || export _SETUP_ENV_SH_INCLUDED=1
# TODO: Use a $(gettop) style method.
export ROOT_DIR=$(readlink -f $PWD)
export BUILD_CONFIG=${BUILD_CONFIG:-build.config}
# Helper function to let build.config files add command to PRE_DEFCONFIG_CMDS, EXTRA_CMDS, etc.
# Usage: append_cmd PRE_DEFCONFIG_CMDS 'the_cmd'
function append_cmd() {
if [ ! -z "${!1}" ]; then
eval "$1=\"${!1} && \$2\""
else
eval "$1=\"\$2\""
fi
}
export KERNEL_DIR
# for case that KERNEL_DIR is not specified in environment
if [ -z "${KERNEL_DIR}" ]; then
# for the case that KERNEL_DIR is not specified in the BUILD_CONFIG file
# use the directory of the build config file as KERNEL_DIR
# for the case that KERNEL_DIR is specified in the BUILD_CONFIG file,
# or via the config files sourced, the value of KERNEL_DIR
# set here would be overwritten, and the specified value would be used.
build_config_path=$(realpath ${ROOT_DIR}/${BUILD_CONFIG})
real_root_dir=${build_config_path%%${BUILD_CONFIG}}
build_config_dir=$(dirname ${build_config_path})
build_config_dir=${build_config_dir##${ROOT_DIR}/}
build_config_dir=${build_config_dir##${real_root_dir}}
KERNEL_DIR="${build_config_dir}"
fi
set -a
. ${ROOT_DIR}/${BUILD_CONFIG}
for fragment in ${BUILD_CONFIG_FRAGMENTS}; do
. ${ROOT_DIR}/${fragment}
done
set +a
export COMMON_OUT_DIR=$(readlink -m ${OUT_DIR:-${ROOT_DIR}/out${OUT_DIR_SUFFIX}/${BRANCH}})
export OUT_DIR=$(readlink -m ${COMMON_OUT_DIR}/${KERNEL_DIR})
export DIST_DIR=$(readlink -m ${DIST_DIR:-${COMMON_OUT_DIR}/dist})
export UNSTRIPPED_DIR=${DIST_DIR}/unstripped
export UNSTRIPPED_MODULES_ARCHIVE=unstripped_modules.tar.gz
export TZ=UTC
export LC_ALL=C
if [ -z "${SOURCE_DATE_EPOCH}" ]; then
export SOURCE_DATE_EPOCH=$(git -C ${ROOT_DIR}/${KERNEL_DIR} log -1 --pretty=%ct)
fi
export KBUILD_BUILD_TIMESTAMP="$(date -d @${SOURCE_DATE_EPOCH})"
export KBUILD_BUILD_HOST=build-host
export KBUILD_BUILD_USER=build-user
export KBUILD_BUILD_VERSION=1
# List of prebuilt directories shell variables to incorporate into PATH
PREBUILTS_PATHS=(
LINUX_GCC_CROSS_COMPILE_PREBUILTS_BIN
LINUX_GCC_CROSS_COMPILE_ARM32_PREBUILTS_BIN
LINUX_GCC_CROSS_COMPILE_COMPAT_PREBUILTS_BIN
CLANG_PREBUILT_BIN
LZ4_PREBUILTS_BIN
DTC_PREBUILTS_BIN
LIBUFDT_PREBUILTS_BIN
BUILDTOOLS_PREBUILT_BIN
)
if [ "${HERMETIC_TOOLCHAIN:-0}" -eq 1 ]; then
HOST_TOOLS=${OUT_DIR}/host_tools
rm -rf ${HOST_TOOLS}
mkdir -p ${HOST_TOOLS}
for tool in \
bash \
git \
perl \
rsync \
sh \
tar \
${ADDITIONAL_HOST_TOOLS}
do
ln -sf $(which $tool) ${HOST_TOOLS}
done
PATH=${HOST_TOOLS}
# use relative paths for file name references in the binaries
# (e.g. debug info)
export KCPPFLAGS="-ffile-prefix-map=${ROOT_DIR}/${KERNEL_DIR}/= -ffile-prefix-map=${ROOT_DIR}/="
# set the common sysroot
sysroot_flags+="--sysroot=${ROOT_DIR}/build/build-tools/sysroot "
# add openssl (via boringssl) and other prebuilts into the lookup path
cflags+="-I${ROOT_DIR}/prebuilts/kernel-build-tools/linux-x86/include "
# add openssl and further prebuilt libraries into the lookup path
ldflags+="-Wl,-rpath,${ROOT_DIR}/prebuilts/kernel-build-tools/linux-x86/lib64 "
ldflags+="-L ${ROOT_DIR}/prebuilts/kernel-build-tools/linux-x86/lib64 "
# Have host compiler use LLD and compiler-rt.
ldflags+="-fuse-ld=lld --rtlib=compiler-rt"
export HOSTCFLAGS="$sysroot_flags $cflags"
export HOSTLDFLAGS="$sysroot_flags $ldflags"
fi
for PREBUILT_BIN in "${PREBUILTS_PATHS[@]}"; do
PREBUILT_BIN=\${${PREBUILT_BIN}}
eval PREBUILT_BIN="${PREBUILT_BIN}"
if [ -n "${PREBUILT_BIN}" ]; then
# Mitigate dup paths
PATH=${PATH//"${ROOT_DIR}\/${PREBUILT_BIN}:"}
PATH=${ROOT_DIR}/${PREBUILT_BIN}:${PATH}
fi
done
export PATH
# verifies that defconfig matches the DEFCONFIG
function check_defconfig() {
(cd ${OUT_DIR} && \
make "${TOOL_ARGS[@]}" O=${OUT_DIR} savedefconfig)
[ "$ARCH" = "x86_64" -o "$ARCH" = "i386" ] && local ARCH=x86
RES=0
diff -u ${KERNEL_DIR}/arch/${ARCH}/configs/${DEFCONFIG} ${OUT_DIR}/defconfig >&2 ||
RES=$?
if [ ${RES} -ne 0 ]; then
echo ERROR: savedefconfig does not match ${KERNEL_DIR}/arch/${ARCH}/configs/${DEFCONFIG} >&2
fi
return ${RES}
}
export -f check_defconfig
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