[petsc-dev] petsc shared libraries on cygwin?

[Brad Aagaard]

Lisandro-

I am not using petsc4py but trying to build PyLith which builds python 
modules that depend on PETSc (like petsc4py), so I assume the linking 
issues are similar to those in petsc4py.

When building the python modules I get warnings like the following and I 
am unable to import the resulting python module (I get errors reporting 
the module doesn't exist because it ends up as a static module).

*** Warning: This system can not link to static lib archive 
../../libsrc/libpylith.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.
*** But as you try to build a module library, libtool will still create
*** a static module, that should work as long as the dlopening application
*** is linked with the -dlopen flag to resolve symbols at runtime.

Brad

On 05/12/2011 02:42 AM, Lisandro Dalcin wrote:
> On 12 May 2011 05:30, Brad Aagaard<baagaard at usgs.gov>  wrote:
>> Under what conditions (configure args), if any, will petsc-dev build a
>> shared library on cygwin? I am getting static libraries which are causing
>> linking problems when trying to build python modules that use petsc.
>>
>> Lisandro- Do you build petsc4py on cywgin? If so, how do you configure petsc
>> and mpi?
>>
>
> I do not build petsc4py on Cygwin, nor Windows. A necessary first step
> is that PETSc can build itself as DLL's. Note that you should be able
> to build petsc4py without DLL's, however you will not be able to use
> any other code that uses PETSc (like SLEPc and slepc4py). I do not
> have this issue with mpi4py, as I can download a binary installer with
> pre-built DLL's. Unfortunately, I do not have the
> expertise+time+interest to get PETSc working on Windows. Once you have
> PETSc DLL's, getting petsc4py is just a matter of 15 minutes of
> hacking and testing.
>
> BTW, what errors do you get when trying to link petsc4py on Cygwin?
>