[petsc-users] Problems about Compiling Multifile Program

[Yingjie Wu]

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/>
>
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