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Date: Thu, 11 Dec 2014 19:04:20 +0100
From: Marco Atzeri <marco DOT atzeri AT gmail DOT com>
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Subject: Re: Building cdo
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On 12/11/2014 6:31 PM, DeTracey, Brendan wrote:
> Hi,
>
> I am trying to build cdo (https://code.zmaw.de/projects/cdo) from source and have a common problem:
> *** Warning: This system can not link to static lib archive /usr/local/lib/libsz.la.
> *** I have the capability to make that library automatically link in when
> *** you link to this library.  But I can only do this if you have a
> *** shared version of the library, which you do not appear to have.
>
> I looked at my build of libsz (from hdf's szip http://www.hdfgroup.org/HDF5/release/obtain5.html#extlibs ) and even though I specified --enable-shared it did not build the shared libraries. Why is this?
>
> I looked at libsz.la and manually built a dll from the object files:
> gcc -shared -o libsz.dll rice.o sz_api.o encoding.o
> but copying the resulting libsz.dll to /use/local/lib is not enough for the cdo build to recognize it as the shared library. It still tries to link to libsz.la
> Do I need  *.dll.a for libsz?

yes


> How do I do this and where do I put the final libsz.dll and corresponding libsz.dll.a?

gcc -shared -Wl,--enable-auto-import -Wl,--enable-auto-image-base \
    -o cygsz.dll -Wl,--out-implib=libsz.dll.a  \
     rice.o sz_api.o encoding.o

cygsz.dll     in /usr/local/bin
libsz.dll.a   in /usr/local/lib


> Pointing me to any documentation would be appreciated. All I have found is Building and Using DLL's in the Cygwin users manual.

same as reported
https://cygwin.com/cygwin-ug-net/dll.html#dll-build

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