Merge pull request #456 from dtolnay/checkcfg

dtolnay · web-flow · commit 37c5d18ec0e7 · 2024-05-06T21:18:33.000-07:00
Resolve unexpected_cfgs warning
diff --git a/build.rs b/build.rs
@@ -34,6 +34,9 @@
 //     macro API and catching a panic if it isn't available. Enabled on Rust
 //     1.57+.
 
+#![allow(unknown_lints)]
+#![allow(unexpected_cfgs)]
+
 use std::env;
 use std::ffi::OsString;
 use std::iter;
@@ -44,6 +47,23 @@ use std::str;
 fn main() {
     let rustc = rustc_minor_version().unwrap_or(u32::MAX);
 
+    if rustc >= 80 {
+        println!("cargo:rustc-check-cfg=cfg(doc_cfg)");
+        println!("cargo:rustc-check-cfg=cfg(fuzzing)");
+        println!("cargo:rustc-check-cfg=cfg(nightly)");
+        println!("cargo:rustc-check-cfg=cfg(no_is_available)");
+        println!("cargo:rustc-check-cfg=cfg(no_literal_byte_character)");
+        println!("cargo:rustc-check-cfg=cfg(no_literal_c_string)");
+        println!("cargo:rustc-check-cfg=cfg(no_source_text)");
+        println!("cargo:rustc-check-cfg=cfg(proc_macro_span)");
+        println!("cargo:rustc-check-cfg=cfg(procmacro2_backtrace)");
+        println!("cargo:rustc-check-cfg=cfg(procmacro2_nightly_testing)");
+        println!("cargo:rustc-check-cfg=cfg(procmacro2_semver_exempt)");
+        println!("cargo:rustc-check-cfg=cfg(span_locations)");
+        println!("cargo:rustc-check-cfg=cfg(super_unstable)");
+        println!("cargo:rustc-check-cfg=cfg(wrap_proc_macro)");
+    }
+
     let docs_rs = env::var_os("DOCS_RS").is_some();
     let semver_exempt = cfg!(procmacro2_semver_exempt) || docs_rs;
     if semver_exempt {
