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#!/bin/bash
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
ERROR=0
TMPDIR=
# If one build fails, continue but return non-0 on exit.
return_value() {
if [ -d "$TMPDIR" ] ; then
rm -rf -- $TMPDIR
fi
exit $ERROR
}
trap return_value EXIT
case $1 in
-h|--help)
echo -e "$0 [-j <n>]"
echo -e "\tTest the different ways of building bpftool."
echo -e ""
echo -e "\tOptions:"
echo -e "\t\t-j <n>:\tPass -j flag to 'make'."
exit
;;
esac
J=$*
# Assume script is located under tools/testing/selftests/bpf/. We want to start
# build attempts from the top of kernel repository.
SCRIPT_REL_PATH=$(realpath --relative-to=$PWD $0)
SCRIPT_REL_DIR=$(dirname $SCRIPT_REL_PATH)
KDIR_ROOT_DIR=$(realpath $PWD/$SCRIPT_REL_DIR/../../../../)
cd $KDIR_ROOT_DIR
check() {
local dir=$(realpath $1)
echo -n "binary: "
# Returns non-null if file is found (and "false" is run)
find $dir -type f -executable -name bpftool -print -exec false {} + && \
ERROR=1 && printf "FAILURE: Did not find bpftool\n"
}
make_and_clean() {
echo -e "\$PWD: $PWD"
echo -e "command: make -s $* >/dev/null"
make $J -s $* >/dev/null
if [ $? -ne 0 ] ; then
ERROR=1
fi
if [ $# -ge 1 ] ; then
check ${@: -1}
else
check .
fi
(
if [ $# -ge 1 ] ; then
cd ${@: -1}
fi
make -s clean
)
echo
}
make_with_tmpdir() {
local ARGS
TMPDIR=$(mktemp -d)
if [ $# -ge 2 ] ; then
ARGS=${@:1:(($# - 1))}
fi
echo -e "\$PWD: $PWD"
echo -e "command: make -s $ARGS ${@: -1}=$TMPDIR/ >/dev/null"
make $J -s $ARGS ${@: -1}=$TMPDIR/ >/dev/null
if [ $? -ne 0 ] ; then
ERROR=1
fi
check $TMPDIR
rm -rf -- $TMPDIR
echo
}
echo "Trying to build bpftool"
echo -e "... through kbuild\n"
if [ -f ".config" ] ; then
make_and_clean tools/bpf
## $OUTPUT is overwritten in kbuild Makefile, and thus cannot be passed
## down from toplevel Makefile to bpftool's Makefile.
# make_with_tmpdir tools/bpf OUTPUT
echo -e "skip: make tools/bpf OUTPUT=<dir> (not supported)\n"
make_with_tmpdir tools/bpf O
else
echo -e "skip: make tools/bpf (no .config found)\n"
echo -e "skip: make tools/bpf OUTPUT=<dir> (not supported)\n"
echo -e "skip: make tools/bpf O=<dir> (no .config found)\n"
fi
echo -e "... from kernel source tree\n"
make_and_clean -C tools/bpf/bpftool
make_with_tmpdir -C tools/bpf/bpftool OUTPUT
make_with_tmpdir -C tools/bpf/bpftool O
echo -e "... from tools/\n"
cd tools/
make_and_clean bpf
## In tools/bpf/Makefile, function "descend" is called and passes $(O) and
## $(OUTPUT). We would like $(OUTPUT) to have "bpf/bpftool/" appended before
## calling bpftool's Makefile, but this is not the case as the "descend"
## function focuses on $(O)/$(subdir). However, in the present case, updating
## $(O) to have $(OUTPUT) recomputed from it in bpftool's Makefile does not
## work, because $(O) is not defined from command line and $(OUTPUT) is not
## updated in tools/scripts/Makefile.include.
##
## Workarounds would require to a) edit "descend" or use an alternative way to
## call bpftool's Makefile, b) modify the conditions to update $(OUTPUT) and
## other variables in tools/scripts/Makefile.include (at the risk of breaking
## the build of other tools), or c) append manually the "bpf/bpftool" suffix to
## $(OUTPUT) in bpf's Makefile, which may break if targets for other directories
## use "descend" in the future.
# make_with_tmpdir bpf OUTPUT
echo -e "skip: make bpf OUTPUT=<dir> (not supported)\n"
make_with_tmpdir bpf O
echo -e "... from bpftool's dir\n"
cd bpf/bpftool
make_and_clean
make_with_tmpdir OUTPUT
make_with_tmpdir O
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