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From: hreba <f_hreba@yahoo.com.br>
Newsgroups: comp.lang.ada
Subject: Re: Example Ada calling Gnu Scientific Library (GSL)
Date: Sun, 9 Apr 2017 12:57:25 +0200
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Xref: news.eternal-september.org comp.lang.ada:46550
Date: 2017-04-09T12:57:25+02:00
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On 04/08/2017 10:28 AM, Simon Wright wrote:
> hreba <f_hreba@yahoo.com.br> writes:
>
>> The missing function is declared in src/gsl_gsl_integration_h.ads as
>>
>>    function gsl_integration_qng
>>      (f : access constant gsl_gsl_math_h.gsl_function;
>>       a : double;
>>       b : double;
>>       epsabs : double;
>>       epsrel : double;
>>       result : access double;
>>       abserr : access double;
>>       neval : access stddef_h.size_t) return int;
>>    pragma Import (C, gsl_integration_qng, "gsl_integration_qng");
>
> What the pragma Import says is that gsl_integration_qng is imported from
> some place else, presumably the C library you've asked gcc to generate a
> skinny binding to.
>
> Here, gsl 2.3, the symbol is in libgsl.
>
>   nm -Aa libgl.a | grep gsl_integration_qng
>
> says
>
>   libgsl.a:qng.o: 00000000000000c0 T _gsl_integration_qng
>
> I don't think the leading underscore is your problem, GNAT knows when
> the platform (macOS here) needs the leading underscore.
>

My directory structure is

└── Num                                    <-- thick bindings
     ├── gsl.gpr
     ├── GSL_Raw                            <-- thin bindings
     │   ├── gsl_raw.gpr
     │   ├── lib
     │   │   ├── alloca_h.ali
     │   │   ├── gsl_gsl_integration_h.ali
             ...
     │   ├── obj
     │   │   ├── alloca_h.ali
     │   │   ├── alloca_h.o
             ...
     │   ├── readme.txt
     │   └── src
     │       ├── alloca_h.ads
     │       ├── gsl_gsl_integration_h.ads
             ...
     ├── lib
     │   ├── gsl.ali
     │   └── libgsl.a
     ├── num.gpr
     ├── obj
     │   ├── auto.cgpr
     │   ├── b__gsl.adb
         ...
     ├── src
     │   ├── gsl.adb
     │   ├── gsl.ads
     │   ├── numfunc.adb
     │   └── numfunc.ads
     ...

So, sitting in directory Num:

nm -Aa GSL_Raw/lib/libgsl_raw.a | grep gsl_integration_qng
says nothing.
nm -Aa lib/libgsl.a | grep gsl_integration_qng
says nothing
nm -Aa /usr/lib/libgsl.a | grep gsl_integration_qng
says /usr/lib/libgsl.a:qng.o:0000000000000000 T gsl_integration_qng

> I hate to ask this, but have you actually linked with -lgsl?
>
Where, how? I have 3 project files now:
1. in Num/GSL_Raw for the thin binding
2. in Num for the thick binding
3. in the directory of my test program
To the first one using your suggestion on 04/05/2017, I added:

    package Builder is
       for Default_Switches ("C") use ("-lgsl");
    end Builder;

but it didn't help. (Sigh)
-- 
Frank Hrebabetzky		+49 / 6355 / 989 5070