Build failure on Kali Rolling (kernel 6.19) due to -Werror in BPF compilation

[MisterHk]

Hello,

First of all, thank you for creating GhostScan.
I spent quite some time testing and building the project on a modern Kali Linux rolling environment and wanted to report a compatibility issue that may affect other users as well.

Environment:

• Distribution: Kali Linux Rolling

• Kernel: 6.19.14+kali-amd64

• Rust/Cargo: current rolling versions

• Clang tested:

  • clang 21.1.8
  • clang 19.1.7

• bpftool installed

• libbpf-dev installed

• all required autotools/build dependencies installed

The project initially failed due to missing build dependencies such as:

• autoreconf
• autopoint
• bison
• bpftool
• libbpf headers

After resolving all dependencies, the remaining issue happens during eBPF compilation.

Current error:
clang fails compiling:
bpf/task_snapshot.bpf.c

Main errors:
vmlinux.h produces several forward declaration warnings/errors such as:

• struct ns_tree;
• struct freelist_tid;
• union pipe_index;
• struct freelist_counters;

The build currently treats these warnings as fatal because build.rs uses:
-Werror

File:
build.rs

Current flags:
.args(["-target", "bpf", "-O2", "-g", "-Wall", "-Werror"])

After removing "-Werror", the build progresses further.

This appears to be related to newer kernels/BTF generation and newer clang behavior on rolling distributions.

Suggestion:

• consider removing -Werror for BPF compilation
  OR
• conditionally disable specific warnings
  OR
• document supported kernel/clang versions

This issue may affect:

• Kali Rolling
• bleeding-edge Debian
• Arch Linux
• newer LLVM/clang environments

I hope this report helps improve compatibility for modern Linux environments.

Thank you again for the project and for your work.