Re: [ublas] lapack bindings - linker errors in windows but not linux

Subject: Re: [ublas] lapack bindings - linker errors in windows but not linux
From: Peter Man (plwm2_at_[hidden])
Date: 2010-04-21 14:32:37

Thanks! It works! The liblapack.a contains dormqr, dgeqrf symbols etc.

However, when compiling my C++ program using g++ on cygwin, it still 
comes up with the linker errors:
/cygdrive/c/cygwin/usr/local/atlas/lib/liblapack.a(ilaenv.o):ilaenv.f:(.text+0x213): 
undefined reference to `__gfortran_compare_string'
/cygdrive/c/cygwin/usr/local/atlas/lib/liblapack.a(ilaenv.o):ilaenv.f:(.text+0x23f): 
undefined reference to `__gfortran_compare_string'
/cygdrive/c/cygwin/usr/local/atlas/lib/liblapack.a(ilaenv.o):ilaenv.f:(.text+0x26b): 
undefined reference to `__gfortran_compare_string'
/cygdrive/c/cygwin/usr/local/atlas/lib/liblapack.a(ilaenv.o):ilaenv.f:(.text+0x297): 
undefined reference to `__gfortran_compare_string'
/cygdrive/c/cygwin/usr/local/atlas/lib/liblapack.a(ilaenv.o):ilaenv.f:(.text+0x2c3): 
undefined reference to `__gfortran_compare_string'
/cygdrive/c/cygwin/usr/local/atlas/lib/liblapack.a(ilaenv.o):ilaenv.f:(.text+0x2eb): 
more undefined references to `__gfortran_compare_string' follow
/cygdrive/c/cygwin/usr/local/atlas/lib/liblapack.a(dlamch.o):dlamch.f:(.text+0xf47): 
undefined reference to `__gfortran_st_write'
/cygdrive/c/cygwin/usr/local/atlas/lib/liblapack.a(dlamch.o):dlamch.f:(.text+0xf63): 
undefined reference to `__gfortran_transfer_integer'
/cygdrive/c/cygwin/usr/local/atlas/lib/liblapack.a(dlamch.o):dlamch.f:(.text+0xf6f): 
undefined reference to `__gfortran_st_write_done'
/cygdrive/c/cygwin/usr/local/atlas/lib/libf77blas.a(xerbla.o):xerbla.f:(.text+0x3f): 
undefined reference to `__gfortran_st_write'
/cygdrive/c/cygwin/usr/local/atlas/lib/libf77blas.a(xerbla.o):xerbla.f:(.text+0x5a): 
undefined reference to `__gfortran_transfer_character'
/cygdrive/c/cygwin/usr/local/atlas/lib/libf77blas.a(xerbla.o):xerbla.f:(.text+0x75): 
undefined reference to `__gfortran_transfer_integer'
/cygdrive/c/cygwin/usr/local/atlas/lib/libf77blas.a(xerbla.o):xerbla.f:(.text+0x7d): 
undefined reference to `__gfortran_st_write_done'
/cygdrive/c/cygwin/usr/local/atlas/lib/libf77blas.a(xerbla.o):xerbla.f:(.text+0x89): 
undefined reference to `__gfortran_stop_numeric'

But I got round that by doing a quick google search and added 
"-lgfortran" flag when compiling. Unfortunately the linker errors are 
still there with VS9.0,
but that's not a real loss, given that I can now compile using g++ cygwin.

Thanks for all your help!!!!

Peter

On 21/04/2010 18:57, Thomas Klimpel wrote:
> Peter Man wrote:
>    
>> I did install atlas, but followed the instructions religiously,
>> including the bit where I do a fake configure
>> of atlas, then install full lapack, and then afterwards do a real
>> configure and install of atlas, which is supposed to link to the full
>> lapack installation if i tell it to.
>>      
> It's not a fake configure. You have to first install "lapack", then do a configure with the "--with-netlib-lapack=NLAPACKdir/<your lapack library name>" flag, and then simply build by typing "make". If you type configure again without the "--with-netlib-lapack=NLAPACKdir/<your lapack library name>" flag, you will override your previous configuration and build without full lapack support.
>
> But as you have already built lapack and atlas, just follow the instructions from<http://math-atlas.sourceforge.net/atlas_install/atlas_install.html#sec-lapack-post>  to get your fully functional liblapack.a:
>
> mkdir tmp
>     cd tmp
>     ar x ../liblapack.a
>     cp<your LAPACK path&  lib>  ../liblapack.a
>     ar r ../liblapack.a *.o
>     cd ..
>     rm -rf tmp
>
>
> Have fun,
> Thomas
> _______________________________________________
> ublas mailing list
> ublas_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/ublas
> Sent to: plwm2_at_[hidden]
>    

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Peter Man                 University of Cambridge,
                           Department of Chemical Engineering
                           and Biotechnology,
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email: mailto:plwm2_at_[hidden]
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