[petsc-users] Problems about Compiling Multifile Program

[Balay, Satish]

Please send complete logs. [i.e the complete compile output from your makefile. Also send your makefile]

If your c++ code uses .cxx - it should get compiled with a c++ compiler.

You might benefit by change CLINKER to CXXLINKER

Satish

On Wed, 24 Oct 2018, Yingjie Wu wrote:

> Thank you very much for your reply.
> 
> Because the files I added are written in c++, including definitions of
> classes and functions. I encountered a mistake when I used your method.
> myprogram: class1.o myprogram.o
>        ${CLINKER} -o myprogram class1.o myprogram.o ${PETSC_LIB}
> Error information is : unknown type name 'class'
> It seems that I did not compile using the c++ compiler.
> 
> How should I set it up so that it can compile successfully?
> 
> Thanks,
> Yingjie
> 
> Matthew Knepley <knepley at gmail.com> 于2018年10月24日周三 上午1:46写道：
> 
> > On Tue, Oct 23, 2018 at 11:37 AM Yingjie Wu <yjwu16 at gmail.com> wrote:
> >
> >> Dear Petsc developer:
> >> Hi,
> >> Thank you very much for your continuous help, I recently encountered some
> >> difficulties in developing programs on Petsc.
> >>
> >> 1. I want to use my class definition (class1. h) and class functions
> >> (class1. cpp) files in my Petsc program (myprogram. c) and compile my
> >> program. I have written other program before:
> >> g++ -c class1.cpp myprogram.c
> >> g++ -o myprogram *.o
> >> I also have some knowledge of Makefile, but I don't know how to modify it
> >> to achieve compilation. I really want your help.
> >>
> >
> > With PETSc makefiles, we have automatic rules, so you can use
> >
> > myprogram: class1.o myprogram.o
> >        ${CLINKER} -o myprogram class1.o myprogram.o ${PETSC_LIB}
> >
> >
> >> 2.  In my class definition and function implementation program, I want to
> >> use Petsc data structures, such as PetscInt, PetscReal. In order to
> >> maintain consistency of the main program. What kind of header files should
> >> I add to my code, or do I need to add any code?
> >>
> >
> > The easiest thing to do is just
> >
> > #include <petsc.h>
> >
> >   Thanks,
> >
> >     Matt
> >
> >
> >> Thanks,
> >> Yingjie
> >>
> >
> >
> > --
> > What most experimenters take for granted before they begin their
> > experiments is infinitely more interesting than any results to which their
> > experiments lead.
> > -- Norbert Wiener
> >
> > https://www.cse.buffalo.edu/~knepley/
> > <http://www.cse.buffalo.edu/~knepley/>
> >
>