[COMMITTED 122/146] gccrs: attributes: Add #[derive] as a built-in attribute

[arthur . cohen]

From: Arthur Cohen <arthur.co...@embecosm.com>

gcc/rust/ChangeLog:

        * util/rust-attribute-values.h: Declare new attribute value.
        * util/rust-attributes.cc: Use it.
---
 gcc/rust/util/rust-attribute-values.h | 1 +
 gcc/rust/util/rust-attributes.cc      | 1 +
 2 files changed, 2 insertions(+)

diff --git a/gcc/rust/util/rust-attribute-values.h 
b/gcc/rust/util/rust-attribute-values.h
index ef01e67dc52..9ef5cc52e81 100644
--- a/gcc/rust/util/rust-attribute-values.h
+++ b/gcc/rust/util/rust-attribute-values.h
@@ -29,6 +29,7 @@ public:
   static constexpr auto &COLD = "cold";
   static constexpr auto &CFG = "cfg";
   static constexpr auto &CFG_ATTR = "cfg_attr";
+  static constexpr auto &DERIVE_ATTR = "derive";
   static constexpr auto &DEPRECATED = "deprecated";
   static constexpr auto &ALLOW = "allow";
   static constexpr auto &ALLOW_INTERNAL_UNSTABLE = "allow_internal_unstable";
diff --git a/gcc/rust/util/rust-attributes.cc b/gcc/rust/util/rust-attributes.cc
index 9f63234112c..03452c75bd8 100644
--- a/gcc/rust/util/rust-attributes.cc
+++ b/gcc/rust/util/rust-attributes.cc
@@ -46,6 +46,7 @@ static const BuiltinAttrDefinition __definitions[]
      {Attrs::COLD, CODE_GENERATION},
      {Attrs::CFG, EXPANSION},
      {Attrs::CFG_ATTR, EXPANSION},
+     {Attrs::DERIVE_ATTR, EXPANSION},
      {Attrs::DEPRECATED, STATIC_ANALYSIS},
      {Attrs::ALLOW, STATIC_ANALYSIS},
      {Attrs::ALLOW_INTERNAL_UNSTABLE, STATIC_ANALYSIS},
-- 
2.45.2