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Date:	Thu, 17 Oct 2013 23:19:04 +0200
From:	marco atzeri <marco DOT atzeri AT gmail DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Linking to static libraries, e.g. gsl and hdf5
References:	<20131018000238 DOT Horde DOT UZElabVgHsspuAWl7bQU_w7 DOT jzlehtol AT webmail DOT helsinki DOT fi>
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Il 10/17/2013 11:02 PM, Susi Lehtola ha scritto:
> Hi,
>
>
> it seems that linking to some static libraries has broken down since the
> last time I tried to recompile my project (in April). Now the linking
> commands fail, e.g.
>
> /usr/bin/g++.exe  -Wall -O2 -funroll-loops -mtune=generic -msse2 -static
> -fopenmp program.cpp -lgsl -lgslcblas -llapack -lblas -lgfortran
>
> results in
>
> /usr/lib/gcc/i686-pc-cygwin/4.7.3/../../../../i686-pc-cygwin/bin/ld:
> cannot find -lgsl
> /usr/lib/gcc/i686-pc-cygwin/4.7.3/../../../../i686-pc-cygwin/bin/ld:
> cannot find -lgslcblas
>
> I also get the same error when linking to -lhdf5.
>
> Having had a look at /usr/lib, I noticed that a lot of the libraries
> follow the *nix convention
> of the static libraries being named libfoo.a, while others have names of
> the type libfoo.dll.a.
> Indeed, the latter was true for the GSL and the HDF5 libraries, and
> symlinking
>
> /usr/lib/libgsl.a -> /usr/lib/libgsl.dll.a
> /usr/lib/libgslcblas.a -> /usr/lib/libgslcblas.dll.a
> /usr/lib/libhdf5.a -> /usr/lib/libhdf5.dll.a
>
> solved the problem.
>
> Why is this not done in the gsl and hdf5 packages? Other packages might
> also be affected.

/usr/lib/libhdf5.dll.a is the dynamic library
so the workaround is a contradiction of your target
" Linking to static libraries"





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