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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Free AMD Core Math Library (BLAS/LAPACK) + Ada
Date: Wed, 11 Jul 2012 18:37:19 +0100
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Date: 2012-07-11T18:37:19+01:00
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Ada novice <shai.lesh@gmx.com> writes:

> On Wednesday, July 11, 2012 4:48:36 PM UTC+1, Georg Bauhaus wrote:
>  
>> http://people.ischool.berkeley.edu/~kevin/unix-tutorial/section3.html
>
> Thanks for the link. That helped and I fixed that part.
>
> In step 5 from Nasser:
>
> http://12000.org/my_notes/ada/index.htm
>
> On issuing gnatmake *.adb, I get:
>
> gcc-4.6 -c ada_blas-complex.adb
> gcc-4.6 -c ada_blas.ads
> gcc-4.6 -c ada_blas-real.adb
> gcc-4.6 -c example1.adb
> gcc-4.6 -c example_support.ads
> gnatbind -x example1.ali
> gnatlink exmaple1.ali
>
> ./exmaple_support_o: In function `example_support_real__blas_amax`
> example_suport.ads(.text+0xeb): undefined reference to `isamax_`
>
> lots of "similar" lines follow
>
> collect2: ld returned 1 exit status
> gnatlink: error when calling (usr/bin gcc-4.6
> gnatmake: *** link failed
>
> Any clue what is going wrong?

You aren't telling the linker that your software needs libblas. 

Try

   gnatmake example1.adb -largs -lblas