On Thu, Oct 12, 2017 at 8:16 AM, Gian-Carlo Pascutto <g...@mozilla.com>
wrote:

> On 11-10-17 11:45, Emilio Cobos Álvarez wrote:
> > Hi,
> >
> > I'm adding a header to the build, and I'm wondering: Can we use pragma
> once?
> >
> > I don't see it anywhere in the build except third-party paths and:
> >
> >   dom/svg/nsISVGPoint.h
> >   xpcom/io/nsAnonymousTemporaryFile.h
> >
> > So I'm not sure if it's because it's somehow prohibited or not
> > recommended, or just because of inertia.
>
> It's covered in our Coding Style:
> https://developer.mozilla.org/en-US/docs/Mozilla/Developer_
> guide/Coding_Style#CC_practices
>
> The #pragma is non-standard (though fairly widely supported), but the
> "portable" way is recognized as equivalent for several compilers. It
> actually seems MSVC is the only one that we (still) use that doesn't
> know about the equivalence.
>

To be fair, the Coding Style doesn't mention `#pragma once`, nor does it
have the discussion provided by gcp.  Should it be added?

Nick
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