Re: Using System.Machine_Code in GPL 2017 Zfp for Arm

[ahlan@marriott.org]

On Monday, November 13, 2017 at 11:08:56 AM UTC+1, ah...@marriott.org wrote:
> We are trying to build a zfp system for an arm M3 processor that is not on the list of supported GPL processors.
> We only want the Ada intrinsics. We do not need or want any RTS and so expected that --RTS=zfp would do the trick.
> however when we place this switch on arm-eabi-gcc from GPL 2017 we get the error message
> RTS path not valid: Missing adainclude and adalib directories.
> So things are not as simple as we thought.
> It appears that --RTS takes the name of a directory so we created one and named this on the RTS switch.
> In the directory we placed two files ada_object_path and ada_source_path that both contain the single word gnat.
> In the RTS directory we then created the empty directory adalib and another  directory gnat and placed in gnat directory the file System.ads which we copied from an RTS directory of a similar processor.
> This all seems to work.
> With this we are able to create simple programs.
> However when we want to use System.Machine_Code we get the error message that
> System.Machine_Code is not a predefined library.
> I suspect that we need to add something to our RTS directory.
> But what?
> Has anyone any experience building ARM ZFP systems and can tell us how we get add System.Machine_Code to our Zfp.
> Any help or suggestions what to do next would be greatly appreciated.
> 
> Best wishes,
> Ahlan

To answer my own question:
You need to add the file s-maccod.ads
However, and this is what confused us, the filename is fixed.
If you rename the file to system-machine_code.ads it doesn't work.