[gcc r14-8935] d: Fix internal compiler error: in make_import, at d/imports.cc:48 [PR113125]

[Iain Buclaw <ibuclaw@gcc.gnu.org>]

https://gcc.gnu.org/g:b0efb1c35724e3332ee5993976efb98200c1a154

commit r14-8935-gb0efb1c35724e3332ee5993976efb98200c1a154
Author: Iain Buclaw <ibuclaw@gdcproject.org>
Date:   Mon Feb 12 16:59:12 2024 +0100

    d: Fix internal compiler error: in make_import, at d/imports.cc:48 [PR113125]
    
    The cause of the ICE was that TYPE_DECLs were only being generated for
    structs with members, not opaque structs.
    
            PR d/113125
    
    gcc/d/ChangeLog:
    
            * types.cc (TypeVisitor::visit (TypeStruct *)): Generate TYPE_DECL and
            apply UDAs to opaque struct declarations.
    
    gcc/testsuite/ChangeLog:
    
            * gdc.dg/imports/pr113125.d: New test.
            * gdc.dg/pr113125.d: New test.

Diff:
---
 gcc/d/types.cc                          | 5 +++++
 gcc/testsuite/gdc.dg/imports/pr113125.d | 2 ++
 gcc/testsuite/gdc.dg/pr113125.d         | 4 ++++
 3 files changed, 11 insertions(+)

diff --git a/gcc/d/types.cc b/gcc/d/types.cc
index af9aad8a4123..ed97aa39cc54 100644
--- a/gcc/d/types.cc
+++ b/gcc/d/types.cc
@@ -1230,6 +1230,11 @@ public:
 	apply_user_attributes (t->sym, t->ctype);
 	finish_aggregate_type (structsize, alignsize, t->ctype);
       }
+    else
+      {
+	build_type_decl (t->ctype, t->sym);
+	apply_user_attributes (t->sym, t->ctype);
+      }
 
     /* For structs with a user defined postblit, copy constructor, or a
        destructor, also set TREE_ADDRESSABLE on the type and all variants.
diff --git a/gcc/testsuite/gdc.dg/imports/pr113125.d b/gcc/testsuite/gdc.dg/imports/pr113125.d
new file mode 100644
index 000000000000..761e613b0552
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/imports/pr113125.d
@@ -0,0 +1,2 @@
+module imports.pr113125;
+struct S113125;
diff --git a/gcc/testsuite/gdc.dg/pr113125.d b/gcc/testsuite/gdc.dg/pr113125.d
new file mode 100644
index 000000000000..cb7300baa1ad
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/pr113125.d
@@ -0,0 +1,4 @@
+// { dg-do compile }
+// { dg-options "-I $srcdir/gdc.dg" }
+module pr113125;
+import imports.pr113125: S113125;