"-u {vimrc}" not working as expected

Question

I am trying to set up vim so I can get different functions in with different files (i.e. x.lisp and x.scm) and in the manual it says starting with the option "-u ufile" uses "ufile" as the vimrc

My problem is that the "-u ufile" option does not work as expected. The shortcut for <C-X><C-O> , instead of executing the commands it literally prints out <C-X><C-O>

here is the exact code

 :inoremap <C-h> <C-X><C-O> 

"this works in the .vimrc file but does nothing on the -u ufile.

 :inoremap ^^ <C-X><C-O>   

"this works in the .vimrc file but literally prints out <C-X><C-O> on the -u ufile.

Is there something wrong with the -u option or am I not understanding the manual correctly?

Note: I have managed to do what I want using the "-s sfile" option, (even though it messes up my history somewhat) but to comment i need to use '| # "comment ' otherwise it is read as well for some reason. I am still curious as to why the -u option does not work.

Answer 1

if you start vim with -u {vimrc} then vim will not automatically switch off compatibility mode.

You need to have set nocp in your ufile (best as the first line)