How to use Zero Footprint runtime with GNAT GPL 2017

[joakimds@kth.se]

Hi!

On the AdaCore blog one can read that there is a ZFP-runtime included with the release of GNAT GPL 2017 a month ago:
http://blog.adacore.com/gnat-gpl-2017-is-out

In the description it says "The native runtime comes with a Zero Foot Print runtime". How does one invoke it? I thought it is enough to add "--RTS=zfp" when invoking gprbuild. What I've done is creating a "Hello World!" application and attempted to buid it with the "--RTS=zfp" switch. I expected the compiler to tell me that "Ada.Text_IO" can't be used with the ZFP runtime. However, gprbuild complains "no language defined for project" instead.

If I could get compilation to work with ZFP runtime, I've been planning to try using GNAT.IO for printing to "standard out". And if that doesn't work, importing OS specific subprograms...

Is there anyone else in the Ada Community that has attempted to use the ZFP runtime? Any hints will be greatly appreciated.

Best regards,
Joakim