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-rw-r--r--third_party/rust/slab/build.rs24
1 files changed, 24 insertions, 0 deletions
diff --git a/third_party/rust/slab/build.rs b/third_party/rust/slab/build.rs
new file mode 100644
index 0000000000..b60351aaf2
--- /dev/null
+++ b/third_party/rust/slab/build.rs
@@ -0,0 +1,24 @@
+fn main() {
+ let cfg = match autocfg::AutoCfg::new() {
+ Ok(cfg) => cfg,
+ Err(e) => {
+ // If we couldn't detect the compiler version and features, just
+ // print a warning. This isn't a fatal error: we can still build
+ // Slab, we just can't enable cfgs automatically.
+ println!(
+ "cargo:warning=slab: failed to detect compiler features: {}",
+ e
+ );
+ return;
+ }
+ };
+ // Note that this is `no_`*, not `has_*`. This allows treating as the latest
+ // stable rustc is used when the build script doesn't run. This is useful
+ // for non-cargo build systems that don't run the build script.
+ if !cfg.probe_rustc_version(1, 39) {
+ println!("cargo:rustc-cfg=slab_no_const_vec_new");
+ }
+ if !cfg.probe_rustc_version(1, 46) {
+ println!("cargo:rustc-cfg=slab_no_track_caller");
+ }
+}