[Bug c++/125487] [13/14/15/16/17 Regression] ICE in DECL_FUNCTION_CODE, at tree.h:4484 on sizeof ternary involving __builtin_is_constant_evaluated()

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125487

Drea Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot 
gnu.org

--- Comment #2 from Drea Pinski <pinskia at gcc dot gnu.org> ---
This fixes the issue, I think. The problem is this builtin is a front-end one
and fold not checking to make sure it was normal builtin when it is called:
```
diff --git a/gcc/builtins.cc b/gcc/builtins.cc
index 05d5fb13bfc..b860f425c37 100644
--- a/gcc/builtins.cc
+++ b/gcc/builtins.cc
@@ -11086,7 +11086,7 @@ fold_call_expr (location_t loc, tree exp, bool ignore)
       if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
         return targetm.fold_builtin (fndecl, call_expr_nargs (exp),
                                     CALL_EXPR_ARGP (exp), ignore);
-      else
+      else if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_NORMAL)
        {
          tree *args = CALL_EXPR_ARGP (exp);
          ret = fold_builtin_n (loc, exp, fndecl, args, nargs, ignore);
```

If I get some time I will test this change.