libffi fails to build on powerpc64-linux

[Peter Bergner]

On Mon, 2012-03-05 at 18:05 -0500, Dennis Clarke wrote:
> > After the latest libffi merge into GCC, GCC no longer builds on
> > powerpc64-linux due to the following errors:
> 
> I ran into a bucket of issues with libffi also :
> 
>   http://sourceware.org/ml/libffi-discuss/2012/msg00048.html
> 
> May or may not be related.

Not related, since I'm not even getting past the build, let alone
firing off the testsuite.  I'll let you know what happens when
I get that far. :)

That said, adding your --enable-debug configure option, I see a few
other changes that should be made to silence some warnings about
casting a pointer to an integer of a different size (ie, smaller):


@@ -155,9 +156,9 @@ ffi_prep_args_SYSV (extended_cif *ecif, unsigned
*const stack)
   next_arg.u = stack + 2;
 
   /* Check that everything starts aligned properly.  */
-  FFI_ASSERT (((unsigned) (char *) stack & 0xF) == 0);
-  FFI_ASSERT (((unsigned) copy_space.c & 0xF) == 0);
-  FFI_ASSERT (((unsigned) stacktop.c & 0xF) == 0);
+  FFI_ASSERT (((unsigned long) (char *) stack & 0xF) == 0);
+  FFI_ASSERT (((unsigned long) copy_space.c & 0xF) == 0);
+  FFI_ASSERT (((unsigned long) stacktop.c & 0xF) == 0);
   FFI_ASSERT ((bytes & 0xF) == 0);
   FFI_ASSERT (copy_space.c >= next_arg.c);


Peter