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Date: Sat, 12 Nov 2016 12:10:13 +0100
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To: Nikita Popov <nikita.ppv@gmail.com>
Cc: PHP internals <internals@lists.php.net>, Anatol Belski <anatol.php@belski.net>
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Subject: Re: [PHP-DEV] C89 vs. C99
From: kalle@php.net (Kalle Sommer Nielsen)

2016-11-12 11:57 GMT+01:00 Nikita Popov <nikita.ppv@gmail.com>:
> It's time to bring this up again. I recently noticed that nowadays only
> Kalle fixes Windows build issues due to C99 declarations-after-code, while
> Anatol doesn't. Am I correct in the assumption that Anatol is using an MSVC
> version that supports the necessary subset of C99, while Kalle uses an
> older version that doesn't support this yet? If so, is it viable for us to
> drop support for these older MSVC versions for master? I'd really like to
> be able to use certain C99 functionality (okay, I'm only really interested
> in declarations mixed with code).

I use VC11, which is the compiler used for 5.6 builds, technically its
on our list to drop support for in 7.2+ I think was the plan, while
Anatol uses VC14+ mainly, which is the compiler used for 7.0+ builds.

So technically I shouldn't really be using VC11 for 7.0+, but on my
current small setup, I have only configured VC11, but I plan on fully
upgrading to VC14 only soon, as 5.6 does not have much active
development that cannot be done on VC14.

According to Wikipedia:
Visual C++ 2012 and earlier did not support C99.
Visual C++ 2013 implements a limited subset of C99 required to compile
popular open-source projects.
Visual C++ 2015 implements the C99 standard library, with the
exception of any library features that depend on compiler features not
yet supported by the compiler (for example, <tgmath.h> is not
implemented).

And ofcourse the version mapping:
VC11 - Visual C++ 2012
VC12 - Visual C++ 2013
VC14 - Visual C++ 2015

So as long as future developments are compatible with VC14, its fine with me

-- 
regards,

Kalle Sommer Nielsen
kalle@php.net