windows报错undefined reference to `__imp_gets_s' collect2.exe: error: ld returned 1 exit status

The error message "undefined reference to `__imp_gets_s'" typically occurs when linking a program on Windows and indicates that the linker cannot find the specified function, specifically `gets_s`, which is part of the Secure CRT library (`_mingw CRT`) for improved security compared to the older `gets` function.

Here's what you can do to address this issue:

1. **Include header**: Ensure that your source code includes the correct header for `gets_s`. You should include `<stdio.h>` for basic input/output functions or `<windows.h>` if using the Secure CRT functions.

#include <windows.h> // If you're using Secure CRT functions

2. **Linking with CRT**: Make sure you link your project with the appropriate libraries for the Secure CRT. In Visual Studio, add `_mingw32.lib` to your Linker settings under Input > Additional Dependencies.

3. **Correctly use the function**: If you are trying to call `gets_s`, ensure you're passing the right parameters, as it has additional requirements for secure buffer management:

char buffer[100];
if (_sgetts_s(&buffer, sizeof(buffer), stdin, NULL) == 0)
{
    // Process the input
}

Alternatively, consider using safer alternatives like `fgets` or `std::getline`.

4. **Rebuild the project**: After making changes, rebuild your project for the updated settings to take effect.

**相关问题--:**
1. What is the purpose of `gets_s` compared to the regular `gets` function?
2. How does including `<windows.h>` affect the behavior of my C++ program on Windows?
3. Are there any compatibility issues with older versions of Visual Studio when using `gets_s`?