examples/rust: Include proper vmlinux.h

The example need to include the correct vmlinux.h header for the current
architecture if they aim to build on arches other than x86. Adjust the
logic accordingly.

Fixes: #247

Author: d-e-s-o

examples/rust/profile/build.rs

@@ -1,4 +1,6 @@
 use std::env;
+use std::env::consts::ARCH;
+use std::path::Path;
 use std::path::PathBuf;
 
 use libbpf_cargo::SkeletonBuilder;
@@ -12,6 +14,19 @@ fn main() {
 
     SkeletonBuilder::new()
         .source(SRC)
+        .clang_args(format!(
+            "-I{}",
+            Path::new("../../../vmlinux")
+                .join(match ARCH {
+                    "aarch64" => "arm64",
+                    "loongarch64" => "loongarch",
+                    "powerpc64" => "powerpc",
+                    "riscv64" => "riscv",
+                    "x86_64" => "x86",
+                    _ => ARCH,
+                })
+                .display()
+        ))
         .build_and_generate(out)
         .expect("bpf compilation failed");
     println!("cargo:rerun-if-changed={}", SRC);

examples/rust/profile/src/bpf/vmlinux.h

@@ -1,4 +1,6 @@
 use std::env;
+use std::env::consts::ARCH;
+use std::path::Path;
 use std::path::PathBuf;
 
 use libbpf_cargo::SkeletonBuilder;
@@ -12,6 +14,19 @@ fn main() {
 
     SkeletonBuilder::new()
         .source(SRC)
+        .clang_args(format!(
+            "-I{}",
+            Path::new("../../../vmlinux")
+                .join(match ARCH {
+                    "aarch64" => "arm64",
+                    "loongarch64" => "loongarch",
+                    "powerpc64" => "powerpc",
+                    "riscv64" => "riscv",
+                    "x86_64" => "x86",
+                    _ => ARCH,
+                })
+                .display()
+        ))
         .build_and_generate(&out)
         .expect("bpf compilation failed");
     println!("cargo:rerun-if-changed={}", SRC);

examples/rust/tracecon/build.rs

@@ -1,4 +1,6 @@
 use std::env;
+use std::env::consts::ARCH;
+use std::path::Path;
 use std::path::PathBuf;
 
 use libbpf_cargo::SkeletonBuilder;
@@ -12,6 +14,19 @@ fn main() {
 
     SkeletonBuilder::new()
         .source(SRC)
+        .clang_args(format!(
+            "-I{}",
+            Path::new("../../../vmlinux")
+                .join(match ARCH {
+                    "aarch64" => "arm64",
+                    "loongarch64" => "loongarch",
+                    "powerpc64" => "powerpc",
+                    "riscv64" => "riscv",
+                    "x86_64" => "x86",
+                    _ => ARCH,
+                })
+                .display()
+        ))
         .build_and_generate(out)
         .unwrap();
     println!("cargo:rerun-if-changed={}", SRC);