This patch should resolve issue #12.
It adds a build.rs file that auto-detects whether the system libc has `statx()`
(by compiling and linking a small C test program), and if there is no
`statx()`, the wrapper in src/passthrough/stat.rs is replaced by a stub that
returns `ENOSYS`.
Auto-detection can be skipped and overridden by enabling either the
enable-statx or the disable-statx feature. (A tri-state would be nice, but
there are no tri-state features.)
Iâm not sure whether we should add something like
```rust
println!("cargo:rerun-if-changed=build.rs");
println!("cargo:rerun-if-changed=build.rs-files");
```
I decided to rather be wary (and not include those lines), because I donât
know whether cargo would rerun build.rs when e.g. the feature selection
changes, or maybe when there is a system update and suddenly the system libc
has `statx()`. For the time being, running build.rs also takes little time, so
it isnât a real problem.
---
https://gitlab.com/virtio-fs/virtiofsd-rs/-/merge_requests/22
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