undefined reference to LAPACKE_***

undefined reference to LAPACKE_***

[Constantinos Zekios]

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'.

Regards,

  Constantine


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Re: undefined reference to LAPACKE_***

[Csaba Raduly]

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
-- 
GCS a+ e++ d- C++ ULS$ L+$ !E- W++ P+++$ w++$ tv+ b++ DI D++ 5++
The Tao of math: The numbers you can count are not the real numbers.
Life is complex, with real and imaginary parts.
"Ok, it boots. Which means it must be bug-free and perfect. " -- Linus Torvalds
"People disagree with me. I just ignore them." -- Linus Torvalds

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Re: undefined reference to LAPACKE_***

[Constantinos Zekios]

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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Re: undefined reference to LAPACKE_***

[Csaba Raduly]

Hi Zekios,

On Sat, Nov 18, 2017 at 7:20 PM, Constantinos Zekios  wrote:
> 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


Please don't top-post on this mailing list. (
https://cygwin.com/acronyms/#TOFU )

I was asking for the linker command line, not the content of the cmake files.
You can get this by running

make VERBOSE=1

or

ninja -v

depending on the generator you chose.


Csaba
-- 
GCS a+ e++ d- C++ ULS$ L+$ !E- W++ P+++$ w++$ tv+ b++ DI D++ 5++
The Tao of math: The numbers you can count are not the real numbers.
Life is complex, with real and imaginary parts.
"Ok, it boots. Which means it must be bug-free and perfect. " -- Linus Torvalds
"People disagree with me. I just ignore them." -- Linus Torvalds

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Re: undefined reference to LAPACKE_***

[René Berber]

On 11/18/2017 10:24 AM, Constantinos Zekios wrote:

>  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'.

Try installing liblapack-devel.
-- 
R. Berber


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Re: undefined reference to LAPACKE_***

[Marco Atzeri]

On 18/11/2017 17:24, 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'.
> 
> Regards,
> 
>   Constantine
> 

lapacke interface is not provided in the cygwin package,
only lapack one.

Regards
Marco


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