使用 Catalina C++ 进行卷曲失败并获得 "Undefined symbols for architecture x86_64"

Question

我正在尝试运行 Catalina 10.15 的示例 c++ 程序：

#include </usr/local/opt/curl/include/curl/curl.h>

int main(void) {

    CURL* curl;
    CURLcode result;

    curl = curl_easy_init();
    curl_easy_setopt(curl, CURLOPT_URL, "https://www.wikipedia.org");

    result = curl_easy_perform(curl);

    curl_easy_cleanup(curl);

    return 0;
}

我安装了 curl：

brew install curl

我不明白为什么这不起作用，我得到：

Scanning dependencies of target 2700
[ 50%] Building CXX object CMakeFiles/2700.dir/main.cpp.o
[100%] Linking CXX executable 2700
Undefined symbols for architecture x86_64:
  "_curl_easy_cleanup", referenced from:
      _main in main.cpp.o
  "_curl_easy_init", referenced from:
      _main in main.cpp.o
  "_curl_easy_perform", referenced from:
      _main in main.cpp.o
  "_curl_easy_setopt", referenced from:
      _main in main.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[3]: *** [2700] Error 1
make[2]: *** [CMakeFiles/2700.dir/all] Error 2
make[1]: *** [CMakeFiles/2700.dir/rule] Error 2
make: *** [2700] Error 2

我的CMakeLists.txt如下：

cmake_minimum_required(VERSION 3.15.3)
project(2700)

include_directories(/usr/local/opt/curl/include/)

set(CMAKE_CXX_STANDARD 17)

add_executable(2700 main.cpp )

我正在使用 CLion，我对 C++ 还很陌生，尤其是在 MacOS 上。

我该怎么做才能使 curl 正常工作而不出现问题？

Answer 1

我意识到我需要在 CMakeLists.txt 中进行链接：

这个有效：

cmake_minimum_required(VERSION 3.15.3)
project(2700)

include_directories(/usr/local/opt/curl/include/)

set(CMAKE_CXX_STANDARD 17)

set(CURL_LIBRARY "-lcurl")
find_package(CURL REQUIRED)

add_executable(2700 main.cpp )

include_directories(${CURL_INCLUDE_DIR})
target_link_libraries(2700 ${CURL_LIBRARIES})

Answer 2

我在 MacOS Big Sur 上遇到了同样的错误……一模一样。为我解决的是这个答案：lib curl symbol not found

您只需link CURL: -lcurl

我也在使用 CLion，但不想为 CMakeLists.txt 文件操心。

通过编译命令添加标志对我来说要容易得多：

c++ main.cpp -o main -lcurl

使用 Catalina C++ 进行卷曲失败并获得 "Undefined symbols for architecture x86_64"

Curl with Catalina C++ failing and getting "Undefined symbols for architecture x86_64"

c++

macos

curl

libcurl