libcurl内存GET示例.exe仅能在MinGW64/bin运行的问题求助

我是C语言新手，运行libcurl内存GET示例（仅修改URL并添加响应体打印），用命令gcc -o curl_ex curl_inMem.c -lcurl编译生成.exe后，只有放在C:\msys64\mingw64\bin目录才能正常运行。在项目目录或其他目录运行时，提示“无法在动态链接库C:\msys64\mingw64\bin\libidn2-0.dll中找到程序入口点DllMain”，放入mingw64\bin则正常。

示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include <curl/curl.h>
 
struct MemoryStruct {
  char *memory;
  size_t size;
};
 
static size_t
WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
{
  size_t realsize = size * nmemb;
  struct MemoryStruct *mem = (struct MemoryStruct *)userp;
 
  char *ptr = realloc(mem->memory, mem->size + realsize + 1);
  if(!ptr) {
    /* out of memory! */
    printf("not enough memory (realloc returned NULL)\n");
    return 0;
  }
 
  mem->memory = ptr;
  memcpy(&(mem->memory[mem->size]), contents, realsize);
  mem->size += realsize;
  mem->memory[mem->size] = 0;
 
  return realsize;
}
 
int main(void)
{
  CURL *curl_handle;
  CURLcode res;
 
  struct MemoryStruct chunk;
 
  chunk.memory = malloc(1);  /* will be grown as needed by the realloc above */
  chunk.size = 0;    /* no data at this point */
 
  curl_global_init(CURL_GLOBAL_ALL);
 
  /* init the curl session */
  curl_handle = curl_easy_init();
 
  /* specify URL to get */
  curl_easy_setopt(curl_handle, CURLOPT_URL, "https://www.aviationweather.gov/adds/dataserver_current/httpparam?dataSource=metars&requestType=retrieve&format=xml&stationString=CYYC&hoursBeforeNow=1");
 
  /* send all data to this function  */
  curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
 
  /* we pass our 'chunk' struct to the callback function */
  curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
 
  /* some servers do not like requests that are made without a user-agent
     field, so we provide one */
  curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "libcurl-agent/1.0");
 
  /* get it! */
  res = curl_easy_perform(curl_handle);
 
  /* check for errors */
  if(res != CURLE_OK) {
    fprintf(stderr, "curl_easy_perform() failed: %s\n",
            curl_easy_strerror(res));
  }
  else {
    /*
     * Now, our chunk.memory points to a memory block that is chunk.size
     * bytes big and contains the remote file.
     *
     * Do something nice with it!
     */
    printf("%s\n", chunk.memory); // Print the response body to stdout
    printf("%lu bytes retrieved\n", (unsigned long)chunk.size);
  }
 
  /* cleanup curl stuff */
  curl_easy_cleanup(curl_handle);
 
  free(chunk.memory);
 
  /* we are done with libcurl, so clean it up */
  curl_global_cleanup();
 
  return 0;
}

• 复制依赖DLL到程序目录：把C:\msys64\mingw64\bin下的libcurl相关依赖DLL（包括libidn2-0.dll、libcurl.dll、libssl-1_1-x64.dll、libcrypto-1_1-x64.dll等）全部复制到curl_ex.exe所在的项目目录，让程序优先加载同目录的匹配版本DLL。
• 静态编译libcurl：将所有依赖打包进exe，彻底消除DLL依赖问题。修改编译命令为：

  gcc -o curl_ex curl_inMem.c -lcurl -lssl -lcrypto -lidn2 -lz -static
  

  若提示缺少静态库，在MSYS2中执行pacman -S mingw-w64-x86_64-libcurl-static安装静态库包。
• 添加mingw路径到系统PATH：将C:\msys64\mingw64\bin加入系统环境变量的PATH，让系统自动在该目录查找依赖DLL。操作后需重启命令提示符或资源管理器生效。
• 排查DLL版本冲突：用Dependency Walker工具查看curl_ex.exe实际加载的DLL路径，确认是否有其他目录的旧版本libidn2-0.dll导致冲突，找到后删除或重命名冲突文件。

内容的提问来源于stack exchange，提问作者NotARealProgrammer