On Wed, 26 Jun 2019, Jakub Kruzik via petsc-dev wrote: > Hello, > > as I mentioned in PR #1819, I would like to use SLEPc in PETSc. > > Currently when PETSc is configured with --download-slepc, it defines > PETSC_HAVE_SLEPC and each compilation of PETSc recompiles SLEPc.
yes - slepc uses petsc, so when petsc is updated - its best to rebuild slepc You can ignore PETSC_HAVE_SLEPC flag [its just a build tool thingy] PETSc code does not use this flag - and there is no circular dependency. > The first way to use SLEPc is from an example. That should be easy, all we > need is to add -lslepc when compiling an example. Its best to use slepc examples as templates - and slepc makefiles [as examples]. --download-slepc is a convinence feature to install petsc and slepc in a single go. It does not change how you would use slepc. Satish > > The other option is to use SLEPc inside PETSc code. I do not know how to > achieve this. One way could be to define PETSC_HAVE_SLEPC after the > compilation of SLEPc and again compile PETSc but this time linking with SLEPc. > Although, even if it works, it is ugly. > > Any ideas on how to achieve the second option? > > Cheers, > > Jakub > >
