编译cpp代码包括使用Cmake的PETSc

Question

我想在cpp代码中使用PETSc。我安装了PETSc，当运行cmd echo $PETSC_DIR时，我得到了库的路径。我写了一个hello world代码然后

#include "petsc.h"
#include <iostream>

int main()
{
   std::cout << "Hello Wold" << std:endl;
}

CMakeLists.txt如下：

cmake_minimum_required(VERSION 3.20.3)
project(ddm_library)

include_directories(include)

file(GLOB SOURCES "src/*.cc")

add_executable(main ${SOURCES})

并运行以下cmds

mkdir build
cd build
cmake CMAKE_INCLUDE_PATH=/opt/petsc/linux-c-opt/include ..
make

当我运行最后一个cmd时，我得到了以下错误

/home/main.cc:5:10: fatal error: petsc.h: No such file or directory
    5 | #include "petsc.h"
      |          ^~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/main.dir/build.make:76: CMakeFiles/main.dir/src/main.cc.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/main.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

我哪里弄错了？

Answer 1

我更改了CMakeLists.txt并使用了find_package(PkgConfig)，现在它可以工作了。CMakeLists.txt的最终版本如下所示

cmake_minimum_required(VERSION 3.20.3)


project(ddm_library)

# PkgConfig 
find_package(PkgConfig)

# PETSc
if (PKG_CONFIG_FOUND)
    pkg_check_modules(PETSC PETSc)
endif()

if (PETSC_FOUND)
    list(APPEND COMPILE_OPTIONS ${PETSC_CFLAGS})

    include_directories(${PETSC_INCLUDE_DIRS})
    
    set(LINK_FLAGS "${LINK_FLAGS} ${PETSC_LDFLAGS}")   
    
    list(APPEND LIBRARIES ${PETSC_LINK_LIBRARIES})   
    
    set(CMAKE_REQUIRED_FLAGS ${PETSC_CFLAGS})   
    
    set(CMAKE_REQUIRED_INCLUDES "${PETSC_INCLUDE_DIRS}")
endif()

include_directories(include )

file(GLOB SOURCES "src/*.cc")

add_executable(main ${SOURCES})