Clang / Windows Build

[dresch86]

I would like to build with clang (llvm-windows). I don't see the options in the CMake to do so though as it defaults to MSVC. Can corrade be built with LLVM's clang?

[mosra]

@Squareys can you comment here? I don't remember the particulars or how far we got when we tried the last time.

[Squareys]

Hey @primesoftware !

You need a special cmake command to tell cmake to use clang in the MSVC project:
cmake -G"Visual Studio 14 2015" -T"LLVM-vs2014" ..

I am unsure if this works, though. I think the cmake still thinks you are using the MSVC compiler and tries to compile with MSVC 15 specific code...

This is what I used back then, but not guarantee that works or even worked back then, it's been a while.

Let me know if you get it to work! :)

[dresch86]

I got it to work!! I added this toolset (https://github.com/WubbaLubba/LlvmForVS2017) to VS and used the command:

cmake -G"Visual Studio 15 2017" -T"LLVM-vs2017" ..

Then I followed the instructions on how to build the rest of the way. Now to see if I can get Magnum to work too...

[mosra]

Wow, this is amazing, thank you!

I think we should add this to the AppVeyor build now :)

[dresch86]

I will have to see if the downloadable SDL dll will work with LLVM code otherwise in order to use clang/llvm with Magnum folks might have to rebuild their required libraries like SDL, GLFW, etc.

[mosra]

With b87f7ab, cd9c0d2, 4491547, d0dfbfd, c0c4a06, 3fc478e, 94594b2, 3b4cade and 0280fbe Corrade compiles on clang-cl cleanly without warnings and passes all tests. It's also tested on the CI now: https://magnum.graphics/build-status/.