[PATCH 105/125] gccrs: Recognize unstable as a builtin attribute

[Arthur Cohen]

From: Owen Avery <powerboat9.ga...@gmail.com>

gcc/rust/ChangeLog:

        * util/rust-attribute-values.h
        (Attributes::UNSTABLE): New.
        * util/rust-attributes.cc
        (__definitions): Add Attributes::UNSTABLE.

gcc/testsuite/ChangeLog:

        * rust/compile/unstable-fn.rs: New test.

Signed-off-by: Owen Avery <powerboat9.ga...@gmail.com>
---
 gcc/rust/util/rust-attribute-values.h     | 1 +
 gcc/rust/util/rust-attributes.cc          | 3 ++-
 gcc/testsuite/rust/compile/unstable-fn.rs | 2 ++
 3 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/rust/compile/unstable-fn.rs

diff --git a/gcc/rust/util/rust-attribute-values.h 
b/gcc/rust/util/rust-attribute-values.h
index 04aef99be68..a8551c07dba 100644
--- a/gcc/rust/util/rust-attribute-values.h
+++ b/gcc/rust/util/rust-attribute-values.h
@@ -52,6 +52,7 @@ public:
   static constexpr auto &RUSTC_INHERIT_OVERFLOW_CHECKS
     = "rustc_inherit_overflow_checks";
   static constexpr auto &STABLE = "stable";
+  static constexpr auto &UNSTABLE = "unstable";
 };
 } // namespace Values
 } // namespace Rust
diff --git a/gcc/rust/util/rust-attributes.cc b/gcc/rust/util/rust-attributes.cc
index e10918b2f8d..84d1781d0b3 100644
--- a/gcc/rust/util/rust-attributes.cc
+++ b/gcc/rust/util/rust-attributes.cc
@@ -60,7 +60,8 @@ static const BuiltinAttrDefinition __definitions[]
      // #![feature(rustc_attrs)]
      {Attrs::RUSTC_DEPRECATED, STATIC_ANALYSIS},
      {Attrs::RUSTC_INHERIT_OVERFLOW_CHECKS, CODE_GENERATION},
-     {Attrs::STABLE, STATIC_ANALYSIS}};
+     {Attrs::STABLE, STATIC_ANALYSIS},
+     {Attrs::UNSTABLE, STATIC_ANALYSIS}};
 
 BuiltinAttributeMappings *
 BuiltinAttributeMappings::get ()
diff --git a/gcc/testsuite/rust/compile/unstable-fn.rs 
b/gcc/testsuite/rust/compile/unstable-fn.rs
new file mode 100644
index 00000000000..4cbbebdb50e
--- /dev/null
+++ b/gcc/testsuite/rust/compile/unstable-fn.rs
@@ -0,0 +1,2 @@
+#[unstable(feature = "some_feature", issue = "12345")]
+pub fn foo() {}
-- 
2.45.2