frozen-abi: Remove proc_macro_hygiene featurization (anza-xyz#109)

Author: joncinque

frozen-abi/build.rs

@@ -17,11 +17,6 @@ fn main() {
         }
         Channel::Dev => {
             println!("cargo:rustc-cfg=RUSTC_WITH_SPECIALIZATION");
-            // See https://github.com/solana-labs/solana/issues/11055
-            // We may be running the custom `rust-bpf-builder` toolchain,
-            // which currently needs `#![feature(proc_macro_hygiene)]` to
-            // be applied.
-            println!("cargo:rustc-cfg=RUSTC_NEEDS_PROC_MACRO_HYGIENE");
         }
     }
 }

frozen-abi/src/lib.rs

@@ -1,6 +1,5 @@
 #![allow(incomplete_features)]
 #![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
-#![cfg_attr(RUSTC_NEEDS_PROC_MACRO_HYGIENE, feature(proc_macro_hygiene))]
 
 // Allows macro expansion of `use ::solana_frozen_abi::*` to work within this crate
 extern crate self as solana_frozen_abi;

perf/build.rs

@@ -27,11 +27,6 @@ fn main() {
         }
         Channel::Dev => {
             println!("cargo:rustc-cfg=RUSTC_WITH_SPECIALIZATION");
-            // See https://github.com/solana-labs/solana/issues/11055
-            // We may be running the custom `rust-bpf-builder` toolchain,
-            // which currently needs `#![feature(proc_macro_hygiene)]` to
-            // be applied.
-            println!("cargo:rustc-cfg=RUSTC_NEEDS_PROC_MACRO_HYGIENE");
         }
     }
 }

programs/address-lookup-table/src/lib.rs

@@ -1,6 +1,5 @@
 #![allow(incomplete_features)]
 #![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
-#![cfg_attr(RUSTC_NEEDS_PROC_MACRO_HYGIENE, feature(proc_macro_hygiene))]
 
 #[cfg(not(target_os = "solana"))]
 pub mod processor;

sdk/program/src/lib.rs

@@ -465,7 +465,6 @@
 
 #![allow(incomplete_features)]
 #![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
-#![cfg_attr(RUSTC_NEEDS_PROC_MACRO_HYGIENE, feature(proc_macro_hygiene))]
 
 // Allows macro expansion of `use ::solana_program::*` to work within this crate
 extern crate self as solana_program;

sdk/src/lib.rs

@@ -31,7 +31,6 @@
 
 #![allow(incomplete_features)]
 #![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
-#![cfg_attr(RUSTC_NEEDS_PROC_MACRO_HYGIENE, feature(proc_macro_hygiene))]
 
 // Allows macro expansion of `use ::solana_sdk::*` to work within this crate
 extern crate self as solana_sdk;