#!/bin/bash

set -o pipefail

set -ex

BPFTRACE_DIR=$(dirname $(realpath "$0"))

DESTDIR="${PWD}/build-libs"

mkdir -p "$DESTDIR"

# If CC is empty (as it is in some CI environments),

# look for gcc or clang instead.

if [[ ! "$CC" ]]; then

if [[ "$(which gcc)" ]]; then

CC=gcc

elif [[ "$(which clang)" ]]; then

CC=clang

else

CC="${CXX}"

fi

fi

# Build libbpf first

make -C "${BPFTRACE_DIR}/libbpf/src" -j$(nproc) \

CC="${CC}" \

OBJDIR="${DESTDIR}" PREFIX="${DESTDIR}" \

install install_uapi_headers

# Build bcc against the libbpf we just built

mkdir -p "${DESTDIR}/bcc"

cd "${DESTDIR}/bcc"

# Generate and install in two separate steps.

# By default, the install make target will try to install

# the C examples as well. Unfortunately, those don't all

# compile against musl/alpine, and it tries to compile them

# even with INSTALL_CPP_EXAMPLES=OFF.

#

# This very precise setup saves build time and works on alpine.

# This logic conceptually matches libbpf's Makefile, so

# libbpf and libbcc end up in the same folder.

if [[ "$(uname -m)" =~ .*(64|s390x).* ]]; then

INSTALL_LIBDIR=lib64

else

INSTALL_LIBDIR=lib

fi

BCC_CMAKE_PARAMS="-DCMAKE_INSTALL_PREFIX='${DESTDIR}' \

-DCMAKE_PREFIX_PATH='${DESTDIR}' \

-DCMAKE_USE_LIBBPF_PACKAGE=ON \

-DCMAKE_INSTALL_LIBDIR=${INSTALL_LIBDIR} \

-DENABLE_MAN=0 \

-DENABLE_EXAMPLES=0 \

-DENABLE_TESTS=0 \

-DENABLE_LIBDEBUGINFOD=0 \

-DLUAJIT= \

-DENABLE_LLVM_NATIVECODEGEN=0"

cmake \

${BCC_CMAKE_PARAMS} \

"${BPFTRACE_DIR}/bcc"

make -j$(nproc) \

clang_frontend api-static bcc-loader-static bcc-shared bcc-static \

bpf-shared bpf-static bps

cmake \

${BCC_CMAKE_PARAMS} \

-P cmake_install.cmake