[PATCH] PR21482: long paths on Windows

[Reid Kleckner]

There are many other instances where we pass paths to win32 APIs in
lib/Support/Windows, but this seems like a good start.

On Mon, Nov 10, 2014 at 1:01 PM, Robinson, Paul <
Paul_Robinson at playstation.sony.com> wrote:

> Support directory names longer than 248 characters on Windows.
>
> The normal Windows path limit is 260 characters; the limit for directory
> names is 248, to leave room for an 8.3 filename at the end.  Adding the
> '\\?\' prefix greatly expands these limits.  Intercept path names that
> we are about to pass to the Windows APIs and add the prefix if necessary.
>
> Also correct the comment about the state of the temporary directory used
> by the Support unittests.
> --paulr
>
>
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