[gcc/devel/rust/master] attributes: Add #[macro_use] as builtin

[Thomas Schwinge]

https://gcc.gnu.org/g:c71b174a29cbd85a4961686eacd02d1fe2a36ea3

commit c71b174a29cbd85a4961686eacd02d1fe2a36ea3
Author: Arthur Cohen <arthur.cohen@embecosm.com>
Date:   Tue Sep 13 16:30:28 2022 +0200

    attributes: Add #[macro_use] as builtin

Diff:
---
 gcc/rust/util/rust-attributes.cc             | 1 +
 gcc/testsuite/rust/compile/macro_export_1.rs | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/gcc/rust/util/rust-attributes.cc b/gcc/rust/util/rust-attributes.cc
index 766697a4600..509f70fe4db 100644
--- a/gcc/rust/util/rust-attributes.cc
+++ b/gcc/rust/util/rust-attributes.cc
@@ -40,6 +40,7 @@ static const BuiltinAttrDefinition __definitions[]
      {"no_mangle", CODE_GENERATION},
      {"repr", CODE_GENERATION},
      {"path", EXPANSION},
+     {"macro_use", NAME_RESOLUTION},
      // From now on, these are reserved by the compiler and gated through
      // #![feature(rustc_attrs)]
      {"rustc_inherit_overflow_checks", CODE_GENERATION}};
diff --git a/gcc/testsuite/rust/compile/macro_export_1.rs b/gcc/testsuite/rust/compile/macro_export_1.rs
new file mode 100644
index 00000000000..f87df083624
--- /dev/null
+++ b/gcc/testsuite/rust/compile/macro_export_1.rs
@@ -0,0 +1,2 @@
+#[macro_use]
+mod foo {}