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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: Wed, 5 Apr 2017 22:21:59 +0200
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Xref: news.eternal-september.org comp.lang.ada:46535
Date: 2017-04-05T22:21:59+02:00
List-Id: <comp.lang.ada>

On 04/05/2017 06:29 PM, Simon Wright wrote:
>
> Try
>
> library project GSL_Raw is
>    for Source_Dirs use ("src");
>    for Library_Dir use "lib"; -- keeps .ali, libgsl_raw.a out of the way
>    for Object_Dir use "obj";  -- for .ali, .o intermediate products
>    for Library_Name use "gsl_raw";
>    for Library_Kind use "static";
>    for Externally_Built use "false"; -- you need to build it
> end GSL_Raw;
>
> and build with "gprbuild -p -P gsl_raw" - "-p" creates necessary
> directories. Result is .ali, libgsl_raw.a in lib/. Don't use
> "externally_built" at this early stage.
>
>> 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 ".";
>
> again, I'd use "lib"
>
Did as you suggested. gprbuild on gsl_raw worked fine. But when I tried 
to build the test program with:

with "../../gsl.gpr";
with "../../../Gen/gen.gpr";

project Test_Integration is
    for Source_Dirs use (".");
    for Object_Dir use "../obj";
    for Exec_Dir use ".";
    for Main use ("test_integration.adb");
    package Compiler is
       for Default_Switches ("ada") use ("-g", "-gnat05");
    end Compiler;
end Test_Integration;

the output was:

gprlib gsl.lexch
gnatbind -n -o b__gsl.adb -Lgsl -a /home/frank/Lib/Ada/Num/obj/gsl.ali
gcc -c -x ada -gnatA -gnatws b__gsl.adb -o b__gsl.o ...
gcc -nostdlib -Wl,-r -o p__gsl_0.o ...
ar cr /home/frank/Lib/Ada/Num/lib/libgsl.a p__gsl_0.o
ranlib libgsl.a
gprbind test_integration.bexch
gnatbind test_integration.ali
gcc -c b__test_integration.adb
gcc test_integration.o -o test_integration
/home/frank/Lib/Ada/Num/Tests/obj/integ_aux.o: In function 
`integ_aux__gsl_test__integration_qng':
/home/frank/Lib/Ada/Num/src/gsl.adb:54: undefined reference to 
`gsl_integration_qng'
collect2: error: ld returned 1 exit status
gprbuild: link of test_integration.adb failed

But in GSL_Raw/src/gsl_gsl_integration_h.ads the procedure 
gsl_integration_qng _is_ declared.

Where might it have gone lost?
-- 
Frank Hrebabetzky		+49 / 6355 / 989 5070