[pling]

That's not a proper C compiler though, as Microsoft like to point out regularly as a lame excuse...

[fdej]

Yet enough people think it's a C compiler that if you try to use avant garde C99 features in your C project, someone will invariably complain that MSVC doesn't build it.

[ibisum]

.. thus giving up C and moving on to C# instead. (Students, I'm looking at you..)

[pjmlp]

MSVC is actually called MSVC++.

Microsoft is committed to C++, as a means to improve systems programming safety with more modern languages.

Besides, the code makes use of GCC extensions.