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Subject: Re: undefined reference to LAPACKE_***
To: cygwin AT cygwin DOT com
References: <fa614009-30e2-64da-f012-7bbcc5c5d3cb AT gmail DOT com> <CAEhDDbAb-2nBvi-7t7aN=9-dFoAEm1=p21-nabyOfZXyEr+dcg AT mail DOT gmail DOT com>
From: Constantinos Zekios <cosoikez AT gmail DOT com>
Message-ID: <26ce98a9-facd-a1df-e0da-84d5d339a1eb@gmail.com>
Date: Sat, 18 Nov 2017 13:20:09 -0500
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Hi Csaba,
  so I am using a cmake and it is of the format:

set(LAPACK_LIB "/usr/lib/liblapack.so")
set(LAPACK_LIB "/usr/lib/liblapacke.so")
set(BLAS_LIB "/usr/lib/libblas.so") for my ubuntu system,

which I changed it to:

set(LAPACK_LIB "/usr/lib/liblapack.a")
set(BLAS_LIB "/usr/lib/libblas.a") for the cygwin.

If I set the set(LAPACK_LIB "/usr/lib/liblapacke.a") it complains that 
it doesn't exist, since as you also said this package doesn't exist in 
Cygwin. So in my code I am calling at some point functions like the 
LAPACKE_zlange and there is the issue. I guess I cannot use them in 
Cygwin, and I will have to change it to FORTRAN calls


On 11/18/2017 12:55 PM, Csaba Raduly wrote:
> Hi Constantinos,
>
> On Sat, Nov 18, 2017 at 5:24 PM, Constantinos Zekios wrote:
>> Hello everybody!
>>
>>   I recently installed cygwin trying to compile my cpp code (it is build
>> under linux) under windows. I am using LAPACKE (the c wrapper to run all the
>> lapack libraries) in my code, but it seems that I am not able to install the
>> packages in cygwin. I have installed lapack, as well as blas. Does anybody
>> know how to install liblapacke.a, liblapacke.dll.a?
>>
>> The errors that I am getting are of the form: undefined reference to
>> 'LAPACKE_zlange'.
> That sounds like the linker complaining about not finding a symbol,
> *not* about a missing library file. If that's the case, installing
> libraries will not help you. Just as well, because there's no Cygwin
> package containing liblapacke.a :
> https://cygwin.com/cgi-bin2/package-grep.cgi?grep=liblapacke&arch=x86_64
> (Found 0 matches for liblapacke)
>
> What was the linker invocation (command line) that generated the error message?
>
> Csaba


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