CMAKE tips(link error of --major-image-version) on Windows

1. One issue I got is link flag was not know by linker ld.exe:

The solution is set CMAKE_SYSTEM_NAME to Generic on the top of CMakelist.txt as:

If you put line 3 after your project(xxx), it doesn't help you to fix this issue.

2. Use cross compiler on Windows

First attention point: In the environment variables, remove other toolchains, or put your cross-compiler toolchains on the top of variable 'PATH'.

Second attention point: Add cross-compiler gcc to environment variable 'CC'.

If the code folders like:

top
|----CMakeList.txt
|----main.c
|--