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From: Brian Drummond <brian@shapes.demon.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: Specifying an `--RTS` option in a GPR file, for a runtime
 library
Date: Wed, 17 Apr 2013 11:43:46 +0000 (UTC)
Organization: A noiseless patient Spider
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Date: 2013-04-17T11:43:46+00:00
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On Mon, 15 Apr 2013 13:22:27 +0200, Yannick Duchêne (Hibou57) wrote:

> Le Mon, 15 Apr 2013 10:19:32 +0200, Brian Drummond
> <brian@shapes.demon.co.uk> a écrit:

>> This error is "cannot find system.ads" -
>      Write_Line ("fatal error, run-time library not installed);
>      Write_Line ("cannot locate file system.ads");
> …but this was not displayed (I checked it with two different terminal
> emulators). Is this the expected behaviour? 

Not to me ... unless GPRbuild suppresses some of the raw tool output. 
Does it have more verbose options? 
I haven't got to grips with it yet.

> I tried with GNATMake, although it seems to not understand the project
> file (it compiles files, but does not link an executable), I still
> tried.
> 
>    * say `runtime` is in <dir>. If I run GNATMake from <dir> to
>      compile a `test.adb` file in <dir> too, seems to be OK with the
>      `--RTS=runtime` option.

So Gnatmake accepts "." as a starting point for the RTS= option, and an 
absolute path.

The other valid root for RTS= options is in the compiler installation 
"lib" directory. I don't know exactly where that would be in your 
installation, but by analogy with a couple of mine :

if the path to my compiler (msp430-gnatmake) is /usr/local/msp430/bin
the root path for RTS= search is
/usr/local/msp430/lib/gcc/msp430/4.7.2/
so that "RTS=rts/msp430f2xx" translates to
/usr/local/msp430/lib/gcc/msp430/4.7.2/rts/msp430f2xx
and the compiler expects to find
/usr/local/msp430/lib/gcc/msp430/4.7.2/rts/msp430f2xx/adainclude/
system.ads

Similarly my AVR-Ada compiler installed in
/opt/avr_472_gnat/bin
expects to see the RTS root path in
/opt/avr_472_gnat/lib/gcc/avr/4.7.2/
so that "RTS=rts/avr5" looks in 
/opt/avr_472_gnat/lib/gcc/avr/4.7.2/rts/avr5

I can only guess that GPRbuild looks here for the RTS and is more 
restricted in its other possibilities.

- Brian