Add experimental BTF support

Signed-off-by: Dave Tucker <dave@dtucker.co.uk>

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
             components: rust-src
 
       - name: Install bpf-linker
-        run: cargo +nightly install bpf-linker
+        run: cargo +nightly install --git https://github.com/dave-tucker/bpf-linker --branch btf bpf-linker
 
       - name: Install Cargo Generate
         run: cargo install --git https://github.com/cargo-generate/cargo-generate cargo-generate

{{project-name}}-ebpf/.cargo/config.toml

@@ -1,6 +1,8 @@
 [build]
 target-dir = "../target"
 target = "bpfel-unknown-none"
+# Experimental: Enable BTF Support. Requires btf-linker 0.9.3+
+# rustflags = ["-C", "link-args=--btf"]
 
 [unstable]
 build-std = ["core"]

{{project-name}}-ebpf/Cargo.toml

@@ -13,12 +13,13 @@ path = "src/main.rs"
 
 [profile.dev]
 panic = "abort"
-debug = 1
 opt-level = 2
 overflow-checks = false
 
 [profile.release]
 panic = "abort"
+# Experimental: Enable BTF Support. Requires btf-linker 0.9.3+
+# debug = 2
 
 [workspace]
 members = []