55eacf43c3
This makes it easier for tooling to find the Rust stuff. Rust/non-rust is not a useful distinction in this repo anymore anyway.
39 lines
1.3 KiB
Rust
39 lines
1.3 KiB
Rust
fn main() {
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// Get nix version
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let nix_version = pkg_config::probe_library("nix-store-c").unwrap().version;
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// Generate version flags
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// Unfortunately, Rust doesn't give us a "greater than" operator in conditional
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// compilation, so we pre-evaluate the version comparisons here, making use
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// of the multi-valued nature of Rust cfgs.
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let relevant_versions = vec!["2.26", "2.33"];
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let versions = relevant_versions
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.iter()
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.map(|v| format!("\"{}\"", v))
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.collect::<Vec<_>>()
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.join(",");
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// Declare the known versions, so that Rust can warn about unknown versions
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// that aren't part of `relevant_versions` yet - feel free to add entries.
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println!(
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"cargo:rustc-check-cfg=cfg(nix_at_least,values({}))",
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versions
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);
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let nix_version = nix_version.split('.').collect::<Vec<&str>>();
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let nix_version = (
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nix_version[0].parse::<u32>().unwrap(),
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nix_version[1].parse::<u32>().unwrap(),
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);
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for version_str in relevant_versions {
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let version = version_str.split('.').collect::<Vec<&str>>();
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let version = (
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version[0].parse::<u32>().unwrap(),
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version[1].parse::<u32>().unwrap(),
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);
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if nix_version >= version {
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println!("cargo:rustc-cfg=nix_at_least=\"{}\"", version_str);
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}
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}
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}
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