On 16/04/2018 01:34, James McCoy wrote:
On Sun, Apr 15, 2018 at 02:32:14PM +0200, Dominique Pellé wrote:
Bram Moolenaar <b...@moolenaar.net> wrote:

Hello Vimmers,

For a long time Vim code was made to be compiled with ANSI C (also known
as C89 and ISO C90).  This means it can also be compiled on very old
systems.  And since it wasn't too much work to support it, that was the

Now that we are adding checks for C89 compliance, it turns out that we
already are using some C99 features, such as the "long long" type.
Also, many libraries produce warnings when enforcing C89.  That means
using C89 is starting to become a hassle.  So, the question comes up: is
it still worth it?

If you CANNOT build Vim with a C99 compiler, please speak up!
If I don't hear about such cases, I think we are better off using C99 as
the standard.

Note that if we go with C99, we still need to decide what features we
will actually use, since C99 compliance was lacking for quite a while
(esp. in MS-Visual C).  That's not going to make this easier.

I would welcome C99.

gcc-4.5 has full support of C99, but many C99 features
were supported much earlier than that, see [1].

It's less clear to me when C99 features were introduced
in Visual studio. C99 support was lagging in Visual Studio.

Visual Studio doesn't fully support C99.  It supports the subset of C99
that overlaps with C++, as well as changes that could be implemented in
the standard library (i.e., didn't require compiler changes).
https://stackoverflow.com/q/9610747/198244 is a useful reference.

That will probably be enough for what Vim (and its dependencies) need.

My experience with a transition period moving to Visual Studio 2015 from earlier versions is that the biggest issue is allowing variable declarations to be declared anywhere within a block - it is very easy to do. If anyone is still using older versions this could become a regular bump in the development road like not casting the result of STRLEN() to an int where needed.

Designated initializers and very large arrays are concious changes in developer habits so will be less likely if they are to be precluded for backward MSVC support.

Perhaps the release of 8.2/9.0 could be a red flag event to only support VS2015 and later.

My 2ps worth to the debate.

I just thought about C99 a few days ago, when I saw a colleague
having a crash with vim, because he did not compile it with
-D_FORTIFY_SOURCE=1. The ugly compilation option won't
be needed with C99,

That would certainly be welcome.



Reality's the only obstacle to happiness.

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