Merging upstream version 1.0.85.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/build.rs b/build.rs
index 656c569..0a95c22 100644
--- 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 +47,22 @@ use std::str;
 fn main() {
     let rustc = rustc_minor_version().unwrap_or(u32::MAX);
 
+    if rustc >= 80 {
+        println!("cargo:rustc-check-cfg=cfg(fuzzing)");
+        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(randomize_layout)");
+        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 {