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Switch from `rustc_version` to `autocfg` 

This switches the `openssl-sys` crate from using `rustc_version` as a
crate to check the version of rustc to using `autocfg`. While
functionally the same this has a few advantages:

* The `autocfg` crate has fewer dependencies and compiles faster
* If the `semver` crate has the `serde` feature activated, turns out
  `openssl-sys` gets compiled quite late in the dependency graph which
  can push back further C compilations. This is due to the slower
  compilation time of `serde` itself.
* The `autocfg` crate I believe is a bit more robust in terms of being
  flexible with the output of rustc itself.
This commit is contained in:
Alex Crichton 2019-05-01 08:09:40 -07:00
parent 3331908a1d
commit 06577cbf9c
2 changed files with 4 additions and 4 deletions
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2
openssl-sys/Cargo.toml
View File

@ -21,7 +21,7 @@ libc = "0.2"
cc = "1.0"
openssl-src = { version = "111.0.1", optional = true }
pkg-config = "0.3.9"
rustc_version = "0.2"
autocfg = "0.1.2"
[target.'cfg(target_env = "msvc")'.build-dependencies]
vcpkg = "0.2"

6
openssl-sys/build/main.rs
View File

@ -2,7 +2,7 @@ extern crate cc;
#[cfg(feature = "vendored")]
extern crate openssl_src;
extern crate pkg_config;
extern crate rustc_version;
extern crate autocfg;
#[cfg(target_env = "msvc")]
extern crate vcpkg;
@ -94,9 +94,9 @@ fn main() {
}
fn check_rustc_versions() {
let version = rustc_version::version().unwrap();
let cfg = autocfg::new();
if version >= rustc_version::Version::new(1, 31, 0) {
if cfg.probe_rustc_version(1, 31) {
println!("cargo:rustc-cfg=const_fn");
}
}