Re: Reducing the size of executables produced by GNAT

[Robert A Duff <bobduff@shell01.TheWorld.com>]

Hibou57 <yannick_duchene@yahoo.fr> writes:

> I'm trying to set up a personalized RTS,...

I don't like to dampen your enthusiasm, but I really think
you're headed in the wrong direction, here.  Writing your
own runtime is a big deal, even for a cut-down version.

And you don't even know that large executable files cause
long startup times -- you should at least measure that,
if that's your concern.

But anyway, if you go this way, first learn to build and modify both the
compiler and the runtime (the existing one).

>... but when I always get this
> message :
>
>> test.adb:2:04: construct not allowed in configurable run-time mode

To debug this, search the compiler sources to find where it prints
this message, and figure out what it's doing.

Do you know about the -gnatD and other related options?
They could come in handy to figure out what's missing.

> where test.adb is
>
>> procedure test is
>> e: exception;
>> begin
>> raise e;
>> exception
>>     when others =>
>>         null;
>> end;
>
> I'm not sure to understand, beceause this seems paradoxal : a custom
> runtime is not allowed to implements every things ? There are things
> that are not allowed with a custom runtime ?

That's not what it means.  It means something is missing.

> I get this with "gnatmake --RTS=... test"
>
> This is strange.

- Bob