Re: [Qemu-devel] Headers without multiple inclusion guards

["Daniel P. Berrangé" <berrange@redhat.com>]

On Tue, May 28, 2019 at 08:12:24PM +0200, Markus Armbruster wrote:
> We have a bunch of headers without multiple inclusion guards.  Some are
> clearly intentional, some look accidental.  Too many for me to find out
> by examining each of them, so I'm asking their maintainers.
> 
> Why do I ask?  I'd like to mark the intentional ones and fix the
> accidental ones, so they don't flunk "make check-headers" from "[RFC v4
> 0/7] Baby steps towards saner headers" just because they lack multiple
> inclusion guards.
> 
> Just in case: what's a multiple inclusion guard?  It's
> 
>     #ifndef UNIQUE_GUARD_SYMBOL_H
>     #define UNIQUE_GUARD_SYMBOL_H
>     ...
>     #endif
> 
> with nothing but comments outside the conditional, so that the header
> can safely be included more than once.

Any opinions on using the less verbose syntax instead:

  #pragma once

It is not portable C, but we explicitly only care about GCC or CLang,
so portability isn't an issue for us.


> Cryptography
> M: Daniel P. Berrange <berrange@redhat.com>
> crypto/ivgen-essiv.h
> crypto/ivgen-plain.h
> crypto/ivgen-plain64.h

These have header guards present

> tests/crypto-tls-psk-helpers.h
> tests/crypto-tls-x509-helpers.h

These should be fixed.

Regards,
Daniel
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