cvisual-studioc99

Which C99 features are available in the MS Visual Studio compiler?

It's well known that Microsoft's Visual Studio compiler does not support C99, and it looks like they have no plans to support it.

However, the compiler does include some cherry picked features such as variadic macros and long long - see the quotes in this answer:

Where we’ve received many requests for certain C99 features, we’ve tried to implement them (or analogues). A couple examples are variadic macros, long long, __pragma, __FUNCTION__, and __restrict. If there are other C99 features that you’d find useful in your work, let us know! We don’t hear much from our C users, so speak up and make yourselves heard

-- Arjun Bijanki, Microsoft’s representative on the ISO C standard committee http://blogs.msdn.com/b/vcblog/archive/2007/11/05/iso-c-standard-update.aspx

Additionally, newer versions of Visual Studio seem to ship with some of the headers required by C99.

There are lots of questions about specific features - but what I wan't to know is: Where can I find a list of the C99 features supported/provided by the current MSVC compiler?

I'm looking for a list like this one for gcc.

Solution

  • Fortunately, Microsoft's stance on this issue has changed. MSVC++ version 12.0 (part of Visual Studio 2013) added support for

    You can check the _MSC_VER macro for values greater than or equal to 1800 to see whether these features are supported.

    Standard library support has been updated and is mostly complete since MSVC 14.0 (Visual Studio 2015). This release also added the inline keyword.

    The restrict keyword, a conformant preprocessor and C11 support arrived in Visual Studio 2019 Release 16.8, but this doesn't include some mandatory C99 features made optional in C11.

    Visual Studio 2022 version 17.5 added support for C11 atomic primitives and types (stdatomic.h).

    C11 threads (threads.h) are supported since Visual Studio 2022 version 17.8.

    Things that earlier versions already supported (I think since at least MSVC 7.1 / Visual Studio 2003):

    This leaves the following features which are optional in C11: