From 33910f9d86cf8c283c51800085c3e863261ec5ae Mon Sep 17 00:00:00 2001
From: wangxiangqing <wangxiangqing@bytedance.com>
Date: Tue, 22 Oct 2019 00:08:14 +0800
Subject: [PATCH 1/3] Deprecated proc_macro doesn't trigger warning on build
 library

Change-Id: Ib3a396e7334d209fe6c6ef425bbfc7b2ae471378
---
 src/libsyntax_ext/proc_macro_harness.rs           | 10 ++++++++++
 .../ui/proc-macro/proc-macro-deprecated-attr.rs   | 15 +++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 src/test/ui/proc-macro/proc-macro-deprecated-attr.rs

diff --git a/src/libsyntax_ext/proc_macro_harness.rs b/src/libsyntax_ext/proc_macro_harness.rs
index 96d0c3fcab1c5..bbf5b1255510f 100644
--- a/src/libsyntax_ext/proc_macro_harness.rs
+++ b/src/libsyntax_ext/proc_macro_harness.rs
@@ -416,6 +416,16 @@ fn mk_decls(
     ).map(|mut i| {
         let attr = cx.meta_word(span, sym::rustc_proc_macro_decls);
         i.attrs.push(cx.attribute(attr));
+
+        let deprecated_attr = attr::mk_nested_word_item(
+            Ident::new(sym::deprecated, span)
+        );
+        let allow_deprecated_attr = attr::mk_list_item(
+            Ident::new(sym::allow, span),
+            vec![deprecated_attr]
+        );
+        i.attrs.push(cx.attribute(allow_deprecated_attr));
+
         i
     });
 
diff --git a/src/test/ui/proc-macro/proc-macro-deprecated-attr.rs b/src/test/ui/proc-macro/proc-macro-deprecated-attr.rs
new file mode 100644
index 0000000000000..32ccc24904283
--- /dev/null
+++ b/src/test/ui/proc-macro/proc-macro-deprecated-attr.rs
@@ -0,0 +1,15 @@
+// build-pass
+
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+use proc_macro::*;
+
+#[proc_macro]
+#[deprecated(since = "1.0.0", note = "test")]
+pub fn test_compile_without_warning_with_deprecated(_: TokenStream) -> TokenStream {
+    "
+    extern crate proc_macro;
+    fn foo() { }
+    ".parse().unwrap()
+}

From c027be0dd09a440927071dea69378d01322373cd Mon Sep 17 00:00:00 2001
From: wangxiangqing <wangxiangqing@bytedance.com>
Date: Tue, 22 Oct 2019 00:08:14 +0800
Subject: [PATCH 2/3] Deprecated proc_macro doesn't trigger warning on build
 library

Change-Id: Ib3a396e7334d209fe6c6ef425bbfc7b2ae471378
---
 src/libsyntax_ext/proc_macro_harness.rs              | 1 +
 src/test/ui/proc-macro/proc-macro-deprecated-attr.rs | 9 ++++-----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/libsyntax_ext/proc_macro_harness.rs b/src/libsyntax_ext/proc_macro_harness.rs
index bbf5b1255510f..c874f1ffb1175 100644
--- a/src/libsyntax_ext/proc_macro_harness.rs
+++ b/src/libsyntax_ext/proc_macro_harness.rs
@@ -337,6 +337,7 @@ impl<'a> Visitor<'a> for CollectProcMacros<'a> {
 //          use proc_macro::bridge::client::ProcMacro;
 //
 //          #[rustc_proc_macro_decls]
+//          #[allow(deprecated)]
 //          static DECLS: &[ProcMacro] = &[
 //              ProcMacro::custom_derive($name_trait1, &[], ::$name1);
 //              ProcMacro::custom_derive($name_trait2, &["attribute_name"], ::$name2);
diff --git a/src/test/ui/proc-macro/proc-macro-deprecated-attr.rs b/src/test/ui/proc-macro/proc-macro-deprecated-attr.rs
index 32ccc24904283..25ce53b70a5bd 100644
--- a/src/test/ui/proc-macro/proc-macro-deprecated-attr.rs
+++ b/src/test/ui/proc-macro/proc-macro-deprecated-attr.rs
@@ -1,4 +1,6 @@
-// build-pass
+// check-pass
+
+#![deny(deprecated)]
 
 #![crate_type = "proc-macro"]
 
@@ -8,8 +10,5 @@ use proc_macro::*;
 #[proc_macro]
 #[deprecated(since = "1.0.0", note = "test")]
 pub fn test_compile_without_warning_with_deprecated(_: TokenStream) -> TokenStream {
-    "
-    extern crate proc_macro;
-    fn foo() { }
-    ".parse().unwrap()
+    TokenStream::new()
 }

From b1331563baa43819b2717a24d2cdc94e3b3a2eb5 Mon Sep 17 00:00:00 2001
From: wangxiangqing <wangxiangqing@bytedance.com>
Date: Tue, 22 Oct 2019 00:08:14 +0800
Subject: [PATCH 3/3] Deprecated proc_macro doesn't trigger warning on build
 library

Change-Id: Ib3a396e7334d209fe6c6ef425bbfc7b2ae471378
---
 src/test/ui/proc-macro/proc-macro-deprecated-attr.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/test/ui/proc-macro/proc-macro-deprecated-attr.rs b/src/test/ui/proc-macro/proc-macro-deprecated-attr.rs
index 25ce53b70a5bd..f1144a4a55b16 100644
--- a/src/test/ui/proc-macro/proc-macro-deprecated-attr.rs
+++ b/src/test/ui/proc-macro/proc-macro-deprecated-attr.rs
@@ -1,4 +1,6 @@
 // check-pass
+// force-host
+// no-prefer-dynamic
 
 #![deny(deprecated)]