Ada: building 4.3 cross-gnattools with gcc-4.2.1

[Rolf Ebert]

I am trying to build a cross compiler based on the current 4.3 snapshot 
with a native compiler based on V4.2.1 (Host=mingw, target=avr). 
Building the cross-gnattools fails with some errors about type mismatch 
in make.adb (system.strings.string_access vs. gnat.strings.string_access).

1) Is it supposed to work? (i.e. building an Ada cross compiler 4.3 by a 
4.2 compiler)

2) does it work to build 4.3 cross-gnattools with the current 4.3 Ada 
compiler?

3) Would a patch be accepted that makes the 4.3 gnattols be compilable 
by 4.2 compiler?

    Rolf