Use xmake to port libbpf-bootstrap and support android bpf program

[waruqi]

libbpf-bootstrap is a great project that allows beginners to quickly get started with bpf program development.

Now I used xmake to port the libbpf-bootstrap program and compiled it to the android platform.

xmake.lua

add_rules("mode.release", "mode.debug")
add_rules("platform.linux.bpf")

add_requires("linux-tools", {configs = {bpftool = true}})
add_requires("libbpf")
if is_plat("android") then
    add_requires("ndk >=22.x")
    set_toolchains("@ndk", {sdkver = "23"})
else
    add_requires("llvm >=10.x")
    set_toolchains("@llvm")
    add_requires("linux-headers")
end

target("minimal")
    set_kind("binary")
    add_files("src/*.c")
    add_packages("linux-tools", "linux-headers", "libbpf")
    set_license("GPL-2.0")

In addition, I ported the libbpf library and other dependent libraries to the android platform. All dependent packages and tool chains can be automatically downloaded and integrated by xmake.

We only need to execute xmake to compile linux bpf program, or use xmake f -p android; xmake to compile android bpf program.

If the user has installed the new version of llvm/clang and ndk r22, then xmake will also give priority to using them and will not download them automatically.

build on linux

It will download llvm toolchain and use it automatically if not found.

we can also install llvm manually. sudo apt install llvm and xmake will also use it.

$ xmake

build android on linux

It will download ndk toolchain and use it automatically

$ xmake f -p android
$ xmake

We can also set ndk toolchain manually (need ndk >= r22)

$ xmake f -p android --ndk=~/file/android-ndk-r22
$ xmake

Here is a libbpf-bootstrap project that I use xmake to ported. The project directory is very clean. We only need to keep the src source file and the xmake.lua project configuration file.

https://github.com/hack0z/libbpf-bootstrap

And I added libbpf package into our official repository, https://github.com/xmake-io/xmake-repo/blob/master/packages/l/libbpf/xmake.lua

If you are interested, I can open a pr and just add xmake.lua to your project, but I will not delete any other files, otherwise please ignore this issue.

Related issue: xmake-io/xmake#1274

Thanks!

[anakryiko]

Let me take a look and get back to you next week. We plan to expand libbpf-bootstrap to have more examples across various platforms and languages (e.g., Rust-based examples), so this might be a good addition. But I need to see what and how all things are put together to make a decision.

[danobi]

My opinion (feel free to ignore me): xmake looks promising and easy to use. I'll probably try it out later for a personal project. But I'm not so sure about introducing non-standard tools to a "teaching" project. The purpose of this repo is to teach people about BPF -- any new tool / technology that isn't directly related to the goal of teaching about BPF is a distraction.

[anakryiko]

@waruqi so after discussing with @danobi some more, I think this might be a good addition to existing Makefile, as well as CMake that we are going to add. Please see #19 for discussion around re-organizing libbpf-bootstrap to allow multiple languages (C and Rust for starters) and having multiple build system integrations. So let's wait for that reorg to be completed, and then work towards merging xmake stuff in. Does this sound good to you?

[waruqi]

ok, thanks!

[anakryiko]

@waruqi now that we have both C and Rust examples, as well as Makefile and CMake-based build scripts, can you take another look if you can adopt your xmake stuff to integrate nicely into this setup?

[waruqi]

@waruqi now that we have both C and Rust examples, as well as Makefile and CMake-based build scripts, can you take another look if you can adopt your xmake stuff to integrate nicely into this setup?

ok, I will look at it later. thanks.

[waruqi]

I have opened a pr to add xmake.lua for building linux/android program. #27