On Tue, Jun 25, 2024 at 12:05 PM Julien BRUCHON via petsc-users <
petsc-users@mcs.anl.gov> wrote:
> Hi, Based on 'cg. c', I'm trying to develop my own Krylov solver (a
> projected conjugate gradient). I want to integrate this into my C++ code,
> where I already have an interface for PETSC which works well. However, I
> have the following questions
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> Hi,
>
> Based on 'cg.c', I'm trying to develop my own Krylov solver (a projected
> conjugate gradient). I want to integrate this into my C++ code, where I
> already have an interface for PETSC which works well. However, I have the
> following questions :
>
> - Where am I sensed to put my 'cg_projected.c' and 'pcgimpl.h' files?
> Should they go in a directory petsc/src/ksp/ksp/impls/pcg/? If so, how do I
> compile that? Is it simply by adding this directory to the Makefile in
> petsc/src/ksp/ksp/impls/?
>
Yes.
Thanks,
Matt
> - I have also tried the basic approach of putting these two files in
> directories of my own C++ code and compiling. However, I have this error
> at the link edition:
> [100%] Linking CXX shared library libcoeur.so
> /usr/bin/ld: src/solvers/libsolvers.a(cg_projected.c.o): warning:
> relocation against `petscstack' in read-only section `.text'
> /usr/bin/ld: src/solvers/libsolvers.a(cg_projected.c.o): relocation
> R_X86_64_PC32 against symbol `petscstack' can not be used when making a
> shared object; recompilé avec -fPIC
> /usr/bin/ld : échec de l'édition de liens finale : bad value
> collect2: error: ld returned 1 exit status
> make[2]: *** [CMakeFiles/coeur.dir/build.make:121 : libcoeur.so] Erreur 1
> make[1]: *** [CMakeFiles/Makefile2:286 : CMakeFiles/coeur.dir/all] Erreur 2
> make: *** [Makefile:91 : all] Erreur 2
>
> Could you please tell me what is the right way to proceed?
>
> Thank you,
>
> Julien
> --
> Julien Bruchon
> Professeur IMT - Responsable du département MPE
> LGF - UMR CNRS 5307 -
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