[Bug go/61204] gccgo: ICE in in fold_convert_loc [GoSmith]

[cmang at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61204

Chris Manghane <cmang at google dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2014-12-10
                 CC|                            |cmang at google dot com
     Ever confirmed|0                           |1

--- Comment #1 from Chris Manghane <cmang at google dot com> ---
This smaller version of this program is:

package main
func main() {
        type t [0]int
        var v t
        v, _ = [0]int{}, 0
        _ = v
}

which fails because [0]int is a zero-sized type and the temporary variable for
that holds [0]int{} cannot be initialized. This patch avoids initializing
zero-sized temporaries:



Index: gcc/go/go-gcc.cc
======================================================================
--- a/gcc/go/go-gcc.cc
+++ b/gcc/go/go-gcc.cc
@@ -2505,7 +2505,7 @@ Gcc_backend::temporary_variable(Bfunction* function,
Bblock* bblock,
       BIND_EXPR_VARS(bind_tree) = BLOCK_VARS(block_tree);
     }

-  if (init_tree != NULL_TREE)
+  if (this->type_size(btype) != 0 && init_tree != NULL_TREE)
     DECL_INITIAL(var) = fold_convert_loc(location.gcc_location(), type_tree,
                                          init_tree);