[PATCH v3] rust: support raw DPDK API

[Dariusz Sosnowski]

On Tue, Mar 18, 2025 at 09:51:05AM +0100, Dariusz Sosnowski wrote:
> > +use std::process::Command;
> > +
> > +pub fn main() {
> > +    let mut pkgconfig = Command::new("pkg-config");
> > +
> > +    match pkgconfig.args(["--libs", "libdpdk"]).output() {
> > +        Ok(output) => {
> > +            let stdout = String::from_utf8_lossy(&output.stdout)
> > +                .trim_end()
> > +                .to_string();
> > +            for token in stdout.split_ascii_whitespace().filter(|s| !s.is_empty()) {
> > +                if token.starts_with("-L") {
> > +                    println!("cargo::rustc-link-search=native={}", &token[2..]);
> > +                } else if token.starts_with("-l") {
> > +                    println!("cargo::rustc-link-lib={}", &token[2..]);
> > +                }
> > +            }
> > +            println!("cargo:rerun-if-changed=build.rs");
> > +        }
> > +        Err(error) => {
> > +            panic!("failed to read libdpdk package: {:?}", error);
> > +        }
> > +    }
> > +}
> 
> 
> What do you think about using pkg_config crate in build scripts?
> (https://crates.io/crates/pkg-config)
> 
> This would allow to remove manual command execution and output parsing with the following:
> 
> 	fn main() {
> 	  pkg_config::probe_library("libdpdk").expect("Unable to find libdpdk");
> 	}
> 
> Also, what do you think about moving this logic to dpdk crate?
> This way dependency resolution would be shared by all examples/applications
> which use the dpdk crate.

I just noticed that similar proposal was raised by Harry previously.
Sorry for the duplication :)