[Bug c++/91505] [10 Regression] ICE in DECL_FUNCTION_CODE, at tree.h:3896

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91505

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This should fix it:
diff --git a/gcc/attribs.c b/gcc/attribs.c
index b89be5834de..90055a612b9 100644
--- a/gcc/attribs.c
+++ b/gcc/attribs.c
@@ -1525,7 +1525,15 @@ duplicate_one_attribute (tree *attrs, tree attr, const
char *name)
 void
 copy_attributes_to_builtin (tree decl)
 {
-  tree b = builtin_decl_explicit (DECL_FUNCTION_CODE (decl));
+  int fcode;
+  if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
+    fcode = DECL_FUNCTION_CODE (decl);
+  else if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_MD)
+    fcode = DECL_MD_FUNCTION_CODE (decl);
+  else
+    fcode = DECL_FE_FUNCTION_CODE (decl);
+
+  tree b = builtin_decl_explicit (static_cast<enum built_in_function>(fcode));
   if (b)
     duplicate_one_attribute (&DECL_ATTRIBUTES (b),
                 DECL_ATTRIBUTES (decl), "omp declare simd");