Re: Example Ada calling Gnu Scientific Library (GSL)

[hreba <f_hreba@yahoo.com.br>]

On 03/29/2017 10:07 PM, Randy Brukardt wrote:
> "hreba" <f_hreba@yahoo.com.br> wrote in message
> news:ek15faF6958U1@mid.individual.net...
>> On 03/29/2017 03:29 AM, Leo Brewin wrote:
>>> Hi Folks,
>>>
>>> I've been following the discussion about the thin bindings to the GSL
>>> library (and thanks to all for the useful information).
>>>
>>
>> Thanks for the example. Nevertheless, I think it is only a first step,
>> because I would prefer an interface to the C library where the client does
>> not have to use the type Interfaces.C.double, or even import Interfaces.
>
> Surely. But the point is that you can use these steps to relatively easily
> make a working thin binding. You then write your intended interface (the
> thick binding) by directly using the thin binding in Ada. That should work
> without stressing the Ada compiler and causing weird failures. (That's how
> the best Ada bindings are built; you have a direct thin binding and then a
> thicker binding that makes the thin binding more appropriate for Ada by
> introducing exceptions, generics, default parameters, sensible Ada naming
> (no camel case!), and so on.)
>
>                                   Randy.
>


Ok, I did this and now I am struggling with the project files. The first 
one handles the thin binding:

library project GSL_Raw is
    for Source_Dirs use ("src");
    for Library_Dir use ".";
    for Library_Name use "gsl_raw";
    for Library_Kind use "static";
    for Externally_Built use "true";
end GSL_Raw;

Directory src contains the output from g++ -c -fdump-ada-spec -C...
There is another directory, obj, which holds the result from
gcc -c -gnat05 ../src/*.ads.

Then there is the project of the thick binding in another directory:

with "GSL_Raw/gsl_raw";
library project GSL is
    for Source_Dirs use ("src");
    for Library_Name use "gsl";
    for Library_Dir use ".";
    for Object_Dir use "obj";
    for Library_Interface use ("gsl");
    for Library_Kind use "static";
    for externally_built use "false";
    package Compiler is
       for Default_Switches ("Ada") use ("-g", "-gnat05");
    end Compiler;
end GSL;

Now when a 3. project, for an executable program, imports project GSL I get:
error: "gsl_gsl_integration_h.ali" not found, 
"gsl_gsl_integration_h.ads" must be compiled

The missing file is present in the directory obj mentioned above, but 
how/where do I specify this?

I included the line

    for Object_Dir use "obj";

in the GSL_Raw project, but to no avail.
-- 
Frank Hrebabetzky		+49 / 6355 / 989 5070