gccrs: Properly striping struct fields when using attrs

gcc/rust/ChangeLog:
	* expand/rust-cfg-strip.cc:
	Strip struct expr fields and strip fields in struct definition
	* expand/rust-cfg-strip.h:
	Signatures for new function maybe_strip_struct_expr_fields

gcc/testsuite/ChangeLog:
	* rust/compile/macro-issue2983_2984.rs:
	Add test to check for correct stripped fields

Signed-off-by: Antonio Gomes <antoniospg100@gmail.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/gcc/testsuite/rust/compile/macro-issue2983_2984.rs b/gcc/testsuite/rust/compile/macro-issue2983_2984.rs
new file mode 100644
index 0000000..637d572
--- /dev/null
+++ b/gcc/testsuite/rust/compile/macro-issue2983_2984.rs
@@ -0,0 +1,27 @@
+pub struct ReadDir {
+    pub inner: i32,
+    #[cfg(not(A))]
+    pub end_of_stream: bool,
+    #[cfg(A)]
+    pub end_of_stream_but_different: bool,
+}
+
+fn main() {
+    // Success
+    let _ = ReadDir {
+        inner: 14,
+        #[cfg(not(A))]
+        end_of_stream: false,
+        #[cfg(A)]
+        end_of_stream_but_different: false,
+    };
+
+    // Error
+    let _ = ReadDir {
+        inner: 14,
+        end_of_stream: false,
+        end_of_stream_but_different: false, // { dg-error "failed to resolve type for field" }
+        // { dg-error "unknown field" "" { target *-*-* } .-1 }
+        // { dg-prune-output "compilation terminated" }
+    };
+}