[Bug c/116892] forward declaration of enum followed by packed on the enum type causes an ICE in verify_type

[uecker at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116892

--- Comment #6 from uecker at gcc dot gnu.org ---

Maybe something like that will do?

diff --git a/gcc/c/c-decl.cc b/gcc/c/c-decl.cc
index 8c420f22976..fb1216fe808 100644
--- a/gcc/c/c-decl.cc
+++ b/gcc/c/c-decl.cc
@@ -10303,6 +10303,7 @@ finish_enum (tree enumtype, tree values, tree
attributes)
       TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
       TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
       ENUM_UNDERLYING_TYPE (tem) = ENUM_UNDERLYING_TYPE (enumtype);
+      TYPE_PACKED (tem) = TYPE_PACKED (enumtype);
     }

   /* Finish debugging output for this type.  */
diff --git a/gcc/testsuite/gcc.dg/pr116892.c b/gcc/testsuite/gcc.dg/pr116892.c
new file mode 100644
index 00000000000..4cfa935eb72
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr116892.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+
+
+enum fmt_type;
+
+void foo(const enum fmt_type a);
+
+enum [[gnu::packed]] fmt_type {
+  A
+} const a;
+