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I installed LLVM for Windows, which includes Clang and a few other tools. It integrates with Visual Studio, and even lets me choose a "Platform Toolset" in the project properties. However, when I choose any of the toolsets that came with LLVM, __clang__ isn't defined, and _MSC_VER is defined instead. How do I make __clang__ defined when using LLVM and Clang in Visual Studio?

My Visual Studio version is the 2015 Preview (however I have also tested on 2013 with no success either), and my LLVM version is based off of SVN release 225473. I've tried LLVM-vs2012, LLVM-vs2013, and LLVM-vs2014 as the Platform Toolset without success.

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    If you want to detect LLVM, check __llvm__. Clang is a GCC replacement, which an MSVC toolset isn't. Commented Jan 19, 2015 at 6:01
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    I am quite sure __clang__ is also defined, at least it was last time I have tested it. Make sure you are checking __clang__ before _MSC_VER. Commented Jan 19, 2015 at 20:09
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    Neither __clang__ nor __llvm__ are defined when using the Platform Toolset in Visual Studio. I got the toolset from llvm.org/builds Commented Jan 19, 2015 at 21:08
  • Have you ever found a solution to this, other than defining clang your own? I have a similar problem but it seems I can not add a custom definition in my environment. Commented Dec 21, 2018 at 13:59
  • @Silicomancer even I'm facing the same issue as your's can u tell me how u solved it i.e without defining clang Commented Mar 17, 2020 at 12:09

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Under Project Properties -> C/C++ -> Preprocessor -> Preprocessor Definitions, add __clang__. Yes, this is just a workaround.

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I guess I can use this for now, as at this point I'm wondering if it's just an oversight on Microsoft's part.

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