Question

我想在linux上的Clion项目中使用pcap。我安装了libpcap-dev：

sudo apt-get install libpcap-dev

然后我尝试编译包含pcap函数的任何文件，如：

#include <stdio.h>
#include <pcap.h>

int main(int argc, char *argv[])
{
    char *dev, errbuf[PCAP_ERRBUF_SIZE];

    dev = pcap_lookupdev(errbuf);
    if (dev == NULL) {
        fprintf(stderr, "Couldn't find default device: %s\n", errbuf);
        return(2);
    }
    printf("Device: %s\n", dev);
    return(0);
}

我有cmake错误：

CMakeFiles/main.cpp.o: In function `main':
/main.cpp:8: undefined reference to `pcap_lookupdev'

之前我没有使用过cmake。 Cmake文件：

cmake_minimum_required(VERSION 3.7)
project(mypr)

set(CMAKE_CXX_STANDARD 11)

set(SOURCE_FILES main.cpp)
add_executable(mypr ${SOURCE_FILES})

Answer 1

您应该在您的CMakeLists.txt中包含并使用FindPCAP.cmake文件。这是一个：https://github.com/bro/cmake/blob/master/FindPCAP.cmake

将FindPCAP.cmake放入项目的源目录并尝试将CMakeLists.txt更改为：

cmake_minimum_required(VERSION 3.7)
project(mypr)

set(CMAKE_CXX_STANDARD 11)

include(FindPCAP.cmake)

set(SOURCE_FILES main.cpp)
add_executable(mypr ${SOURCE_FILES})
target_link_libraries(mypr ${PCAP_LIBRARY})

Answer 2

我认为您也可以使用CMAKE_MODULE_PATH（假设FindPCAP.cmake在项目的源目录中）：

cmake_minimum_required(VERSION 3.7)
project(mypr)

set(CMAKE_CXX_STANDARD 11)

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/")

find_package(PCAP REQUIRED)

set(SOURCE_FILES main.cpp)
add_executable(mypr ${SOURCE_FILES})
target_link_libraries(mypr ${PCAP_LIBRARY})

cmake：对任何pcap函数的未定义引用

2 个答案: