From 93cec568aec11db1caccb1e731264e7038f25c65 Mon Sep 17 00:00:00 2001
From: Trevor Gross <tmgross@umich.edu>
Date: Wed, 27 Nov 2024 17:10:52 -0500
Subject: [PATCH] Fix the build with `rustc-dep-of-std`

Since [1] we use derive macros rather than manually implementing `Clone`
and `Copy`. However, this caused the build in `std` to start failing
since the `core` prelude is not available. This provides the derive
macros as well as `derive` itself.

Resolve this by using complete paths. Additionally allow
`internal_features` to suppress the warning using `link_cfg`.

Link: https://github.com/rust-lang/libc/pull/4038 [1]
---
 src/lib.rs    |  1 +
 src/macros.rs | 25 +++++++++++++++++--------
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 35b68ded5c9e..01c092b2a6b4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -20,6 +20,7 @@
 #![cfg_attr(libc_deny_warnings, deny(warnings))]
 // Attributes needed when building as part of the standard library
 #![cfg_attr(feature = "rustc-dep-of-std", feature(link_cfg, no_core))]
+#![cfg_attr(feature = "rustc-dep-of-std", allow(internal_features))]
 // Enable extra lints:
 #![cfg_attr(feature = "extra_traits", deny(missing_debug_implementations))]
 #![deny(missing_copy_implementations, safe_packed_borrows)]
diff --git a/src/macros.rs b/src/macros.rs
index 92345928a769..74f4761aac13 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -108,8 +108,11 @@ macro_rules! s {
     (it: $(#[$attr:meta])* pub struct $i:ident { $($field:tt)* }) => (
         __item! {
             #[repr(C)]
-            #[cfg_attr(feature = "extra_traits", derive(Debug, Eq, Hash, PartialEq))]
-            #[derive(Copy, Clone)]
+            #[cfg_attr(
+                feature = "extra_traits",
+                core::prelude::v1::derive(Debug, Eq, Hash, PartialEq)
+            )]
+            #[core::prelude::v1::derive(core::clone::Clone, core::marker::Copy)]
             #[allow(deprecated)]
             $(#[$attr])*
             pub struct $i { $($field)* }
@@ -127,8 +130,11 @@ macro_rules! s_paren {
         pub struct $i:ident ( $($field:tt)* );
     )*) => ($(
         __item! {
-            #[cfg_attr(feature = "extra_traits", derive(Debug, Eq, Hash, PartialEq))]
-            #[derive(Copy, Clone)]
+            #[cfg_attr(
+                feature = "extra_traits",
+                core::prelude::v1::derive(Debug, Eq, Hash, PartialEq)
+            )]
+            #[core::prelude::v1::derive(core::clone::Clone, core::marker::Copy)]
             $(#[$attr])*
             pub struct $i ( $($field)* );
         }
@@ -149,7 +155,7 @@ macro_rules! s_no_extra_traits {
     (it: $(#[$attr:meta])* pub union $i:ident { $($field:tt)* }) => (
         __item! {
             #[repr(C)]
-            #[derive(Copy, Clone)]
+            #[core::prelude::v1::derive(core::clone::Clone, core::marker::Copy)]
             $(#[$attr])*
             pub union $i { $($field)* }
         }
@@ -158,7 +164,7 @@ macro_rules! s_no_extra_traits {
     (it: $(#[$attr:meta])* pub struct $i:ident { $($field:tt)* }) => (
         __item! {
             #[repr(C)]
-            #[derive(Copy, Clone)]
+            #[core::prelude::v1::derive(core::clone::Clone, core::marker::Copy)]
             $(#[$attr])*
             pub struct $i { $($field)* }
         }
@@ -186,8 +192,11 @@ macro_rules! e {
         pub enum $i:ident { $($field:tt)* }
     )*) => ($(
         __item! {
-            #[cfg_attr(feature = "extra_traits", derive(Debug, Eq, Hash, PartialEq))]
-            #[derive(Copy, Clone)]
+            #[cfg_attr(
+                feature = "extra_traits",
+                core::prelude::v1::derive(Debug, Eq, Hash, PartialEq)
+            )]
+            #[core::prelude::v1::derive(core::clone::Clone, core::marker::Copy)]
             $(#[$attr])*
             pub enum $i { $($field)* }
         }