[petsc-users] 捕获

[Matthew Knepley]

On Thu, Dec 14, 2023 at 1:27 AM 2111191--- via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Dear SLEPc Developers,
>
> I a am student from Tongji University. Recently I am trying to write a c++
> program for matrix solving, which requires importing the PETSc library that
> you have developed. However a lot of errors occur in the cpp file when I
> use #include <petscts.h> directly. I also try to use extern "C" but it
> gives me the error in the picture below. Is there a good way to use the
> PETSc library in a c++ program? (I compiled using cmake and my compiler is
> g++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44)).
>
> My cmakelists.txt is:
>
> cmake_minimum_required(VERSION 3.1.0)
>
> set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
>
> set(PETSC $ENV{PETSC_DIR}/$ENV{PETSC_ARCH})
> set(SLEPC $ENV{SLEPC_DIR}/$ENV{PETSC_ARCH})
> set(ENV{PKG_CONFIG_PATH} ${PETSC}/lib/pkgconfig:${SLEPC}/lib/pkgconfig)
>
> set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
> set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
>
> project(test)
>
> add_executable(${PROJECT_NAME} eigen_test2.cpp)
> find_package(PkgConfig REQUIRED)
>
> pkg_search_module(PETSc REQUIRED IMPORTED_TARGET PETSc)
> target_link_libraries(${PROJECT_NAME} PkgConfig::PETSc)
>
> The testing code is:eigen_test2.cpp
>

First, get rid of the "extern C" in front of the headers.

  Thanks,

     Matt


> extern "C"{
>    //#include <petsc.h>
>    #include <petscts.h>
>    #include <petscdm.h>
>    #include <petscdmda.h>
>    #include <petscdraw.h>
> }
>
> int main(int argc,char **argv)
> {
>    return 0;
> }
>
>
>
> Best regards
>
> Weijie Xu
>
>

-- 
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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