Currently, the esp-idf-sys library, which is used to compile this clang-sys library, fails to compile.
(esp-rs/espup#440)

When compiling esp-idf-sys, the executable files required to compile the esp microcontroller are downloaded and the directory is added to the PATH environment variable.
The dll file in this downloaded conflicts with the dll file that libclang.dll depends on, causing libclang.dll to fail to load.

This error can be resolved by prioritizing loading dll in the directory containing libclang.dll.

※ This is not a problem for non-Windows users because they do not use the PATH environment variable to search for libraries.