2008-04-24  Olivier Hainque  <hainque@adacore.com>

        ada/
        * trans.c (Attribute_to_gnu) <case Attr_Length>: Length
        * computation
        doesn't require signed arithmetic anymore.

        testsuite/
        * gnat.dg/concat_length.adb: New test.

From-SVN: r134627