/usr/share/vim/vimrc taking precedence over ~/.vimrc for textwidth

Question

Here is my ${HOME}/.vimrc :

set textwidth=0
set history=100

(FWIW, inverting their order has no effect, as one would expect.)

It is read by vim (:echo $MYVIMRC returns the correct path), and indeed set history (actually included to check if it was a .vimrc inclusion issue) is taken into account, but not set textwidth :

:verbose set textwidth
  textwidth=78
    Last set from /usr/share/vim/vimrc

:verbose set history
  history=100
    Last set from ~/.vimrc

Yet if I source my .vimrc it does set textwidth :

:so ~/.vimrc
:verbose set textwidth
  textwidth=0
    Last set from ~/.vimrc

What's wrong, and what can I do to force textwidth to be set by my user .vimrc ?

Answer 1

From /usr/share/vim/vimrc :

" Only do this part when compiled with support for autocommands.
if has("autocmd")

  […]

  " For all text files set 'textwidth' to 78 characters.
  autocmd FileType text setlocal textwidth=78

Apparently these settings override basic custom .vimrc settings. I replaced set textwidth=0 in my .vimrc with

  autocmd VimEnter * set textwidth=0

and now vim behaves as I expected.