[petsc-users] Makefile problems: environmental variables, includes paths and libraries.

[Smith, Barry F.]

  Looks like you are missing a 

      use petsc

or 

      use petscsys

It is often best to start with a PETSc example that builds as a Skelton for your code and then add and remove from it to get the code you want.

   Barry


> On Oct 17, 2019, at 1:28 PM, Matthew Agius via petsc-users <petsc-users at mcs.anl.gov> wrote:
> 
> Thanks for your help
> Now I have this error:
> 
> Error: Symbol 'petsc_null_character' at (1) has no IMPLICIT type
> 
> Any idea on this one?
> 
> 
> petscinv.F90:147.56:
>             call PetscOptionsGetInt(PETSC_NULL_CHARACTER,&
>                                                         1
> Error: Symbol 'petsc_null_character' at (1) has no IMPLICIT type
> petscinv.F90:227.12:
>         use module_options
>             1
> Fatal Error: Can't open module file 'module_options.mod' for reading at (1): No such file or directory
> make: [petscinv] Error 1 (ignored)
> 
> 
> Many many thanks dear PETSc users !
> Matthew 
> 
> 
> On Tue, 15 Oct 2019 at 18:42, Balay, Satish <balay at mcs.anl.gov> wrote:
> On Tue, 15 Oct 2019, Matthew Agius via petsc-users wrote:
> 
> > Dear PETSC users,
> > 
> > This is my first attempt at PETSC package.
> > 
> > First step, I think I have installed PETSC, well at least no errors.
> > Now I am trying to run a simple makefile as suggested in the manual
> > I am confused about undeclared variables in the example makefiles that I am
> > coming across; variables such as:
> > 
> > > ${CLINKER}   ${PETSC_LIB}   ${PETSC_SYS_LIB}   ${PETSC_VEC_LI B}
> > > ${PETSC_MAT_LIB}   ${PETSC_DM_LIB}   ${PETSC_KSP_LIB}   ${PETSC_SNES_LIB}
> > > or ${PETSC_TS_LIB}.
> > 
> > Are these environmental variables?
> 
> nope - they are declared in other makefiles - and picked up with:
> 
> include ${PETSC_DIR}/lib/petsc/conf/variables
> include ${PETSC_DIR}/lib/petsc/conf/rules
> 
> 
> > So far I only have PETSC_DIR declared in my environment.
> > Do I have to declare each one? What are they?
> > 
> > The error I am actually getting is
> > 
> > > error #6404: This name does not have a type, and must have an explicit
> > > type.   [PETSC_NULL_CHARACTER]
> > 
> > This is probably due to a missing Include library file in the compilation.
> > Any hint which one it is?
> 
> Presumably this is not a petsc example with petsc makefile.
> 
> Please compare the output of compiling your code/makefile - with a petsc example/makefile and check for differences.
> 
> i.e
> cd src/ksp/ksp/examples/tutorials
> make ex2
> 
> Satish
>