bug#6084: Flymake should check if buffer-file-name is nil

[Lars Magne Ingebrigtsen]

Lennart Borgman <lennart.borgman@gmail.com> writes:

> Should not flymake check if there is a buffer-file-name when it is
> turned on? The whole structure of it assumes there is a buffer file
> name.
>
> Please add a check at the beginning of flymake-mode, but just give a
> message and turn of flymake-mode. Giving an error would be rather bad
> since flymake-mode is often turned on in a major mode hook.

I've now added this check to Emacs 24.

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