vscodeでc++でcurlのソースがコンパイルエラー

Question

windows10(64bit)でvscodeのc++で下記のソースをコンパイルすると下記のエラーが発生します。
どのように修正したらよいでしょうか？
なお、curlは"C:\Program Files (x86)\curl-7.75.0-win64-mingw"に配置してます。

Executing task in folder vscode_cpp_sample: C:\Program Files (x86)\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin\g++.exe -g -IC:/Program Files (x86)/curl-7.75.0-win64-mingw/include -DCURL_STATICLIB -LC:/Program Files (x86)/curl-7.75.0-win64-mingw/lib -lcurl.dll -oa.exe main.cpp <
C:\Users\N-MASH~1\AppData\Local\Temp\ccFzYcEX.o: In function main': C:\source\repos\vscode_cpp_sample/main.cpp:42: undefined reference to curl_easy_init'
C:\source\repos\vscode_cpp_sample/main.cpp:44: undefined reference to curl_easy_setopt' C:\source\repos\vscode_cpp_sample/main.cpp:45: undefined reference to curl_easy_setopt'
C:\source\repos\vscode_cpp_sample/main.cpp:48: undefined reference to curl_slist_append' C:\source\repos\vscode_cpp_sample/main.cpp:49: undefined reference to curl_easy_setopt'
C:\source\repos\vscode_cpp_sample/main.cpp:51: undefined reference to `curl_easy_perform'
collect2.exe: error: ld returned 1 exit status
ターミナル プロセス "C:\Program Files (x86)\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin\g++.exe '-g', '-IC:/Program Files (x86)/curl-7.75.0-win64-mingw/include', '-DCURL_STATICLIB', '-LC:/Program Files (x86)/curl-7.75.0-win64-mingw/lib', '-lcurl.dll', '-oa.exe', 'main.cpp'" が終了コード 1 で終了しました。

c_cpp_properties.json

{
    "configurations": [
        {
            "name": "Win32",
            "includePath": [
                "${workspaceFolder}/**",
                "C:\Program Files (x86)\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\include",
                "C:\Program Files (x86)\curl-7.75.0-win64-mingw\include"
            ],
            "defines": [
                "_DEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "compilerPath": "C:\Program Files (x86)\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin\g++.exe",
            "cStandard": "c11",
            "cppStandard": "c++17",
            "intelliSenseMode": "clang-x64"
        }
    ],
    "version": 4
}

tasks.json

{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "tasks": [
        {
            "label": "echo",
            "type": "process",
            "command": "g++",
            "args": [
                "-g",
                "main.cpp",
                "-oa.exe",
                "-DCURL_STATICLIB",
                "-IC:/Program Files (x86)/curl-7.75.0-win64-mingw/include",
                "-LC:/Program Files (x86)/curl-7.75.0-win64-mingw/lib",
                "-lcurl"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            }
        }
    ]
}

main.cpp

#include <iostream>
#include <winsock2.h>
#include <windows.h>
#include <curl\curl.h>
#include <curl\easy.h>

int main(int argc, char **argv)
{
    CURL *hnd = curl_easy_init();

    curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "GET");
    curl_easy_setopt(hnd, CURLOPT_URL, "https://www.yahoo.co.jp/");

    struct curl_slist *headers = NULL;
    headers = curl_slist_append(headers, "user-agent: vscode-restclient");
    curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);

    CURLcode ret = curl_easy_perform(hnd);

    return 0;
}

Answer 1

いずれも関数が見つからない、というエラーなので、ライブラリ設定など見直してみては