gccrs: Fix NR2 ICE in visit_attributes

Undefined attribute macros have no proc macro definition, which results
in a failing `rust_assert`. This changes that assert to an if statement,
that returns early if there is no proc macro definition. Fixes #3661.

gcc/rust/ChangeLog:

	* resolve/rust-early-name-resolver-2.0.cc (Early::visit_attributes): rust_assert to if

gcc/testsuite/ChangeLog:

	* rust/compile/issue-3661.rs: Test NR2 has expected behavior

Signed-off-by: Tom Schollenberger <tss2344@g.rit.edu>

diff --git a/gcc/rust/resolve/rust-early-name-resolver-2.0.cc b/gcc/rust/resolve/rust-early-name-resolver-2.0.cc
index 1e29c7967b82a1c418f12b3e80ffca373b731374..b00bd1ee7f8ec7d761f9f287152ef22ebb546367 100644 (file)
--- a/gcc/rust/resolve/rust-early-name-resolver-2.0.cc
+++ b/gcc/rust/resolve/rust-early-name-resolver-2.0.cc
@@ -350,7 +350,8 @@ Early::visit_attributes (std::vector<AST::Attribute> &attrs)
          auto pm_def = mappings.lookup_attribute_proc_macro_def (
            definition->get_node_id ());
 
-         rust_assert (pm_def.has_value ());
+         if (!pm_def.has_value ())
+           return;
 
          mappings.insert_attribute_proc_macro_invocation (attr.get_path (),
                                                           pm_def.value ());

diff --git a/gcc/testsuite/rust/compile/issue-3661.rs b/gcc/testsuite/rust/compile/issue-3661.rs
new file mode 100644 (file)
index 0000000..8d03c36
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-3661.rs
@@ -0,0 +1,10 @@
+pub macro m($inner_str:expr) {
+    #[m = $inner_str] 
+    // { dg-error "macro not found" "" { target *-*-* } .-1 }
+
+    struct S;
+}
+
+fn main() {
+    m!(stringify!(foo));
+}