msys2l进入ucrt

MSYS2 is a popular Windows development environment that provides a Unix-like environment, including the command-line tools and package management system, on top of Windows. When you want to use it to enter the UCRT (Universal C Run-Time) environment, you typically need to perform a few steps:

1. **Update MSYS2**: Make sure your MSYS2 installation is up-to-date by running `pacman -Syu` in the msys2 terminal.

2. **Install UCRT packages**: UCRT is included with some recent versions of MinGW (Minimalist GNU for Windows), which comes bundled with MSYS2. You can check if UCRT is already installed by running `mingw32-make --version`. If not, install it using `pacman -S mingw-w64-x86_64-ucrt`.

3. **Set up environment variables**: After installing UCRT, you may need to set the path to the UCRT executables in your system's PATH environment variable. This will allow you to run UCRT programs from any directory.

4. **Switch shells**: If you want to work specifically in the UCRT shell, you can launch it using `usr/bin/bash` or `usr/bin/sh`. It might be called `bash.exe` or `sh.exe` under MSYS2.

5. **Test your setup**: To ensure everything is working as expected, try compiling a C++ program that uses UCRT libraries and see if the compiler and runtime are recognized.

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