Clang/LLVM compilation on W10 x64

Windows
1

Hi there,

I am trying to compile on VS2019 using Clang/LLVM (W10 x64) but I get three errors:

  1. expected a ‘)’
    ( juce_VST3_Wrapper.cpp, line 3159 )

  2. pragma comment requires parenthesized identifier and optional string
    ( juce_VST3_Wrapper.cpp, line 3159 )

  3. use of undeclared identifier ‘__cpuid’
    ( juce_win32_SystemStats.cpp, line 66)

I have no problems with other compilers, nor with Clang/LLVM when compiling other stuff.

Thanks,
Esteban

2

Hi @estefield,

Which version/commit of JUCE are you using?

3

Hi McMartin,

My version is 5.4.5.

Thanks,
Esteban

4

Clang support on Windows is quite a recent change in JUCE, but it should work with the current develop or juce6 branches.

5

Thanks Reuk,

Is juce6 a stable branch?

6

No, we’re still getting it ready for the proper release, but that should be happening quite soon now. I don’t expect there to be large changes between now and the release.

7

OK. I will wait, then.
In off-JUCE tests of my code, LLVM gives me over 50% improvement in efficiency as compared to other compilers, so this will be great!
Thanks for the prompt response,

8

AFAICS, several issues with Clang on Windows were fixed in this commit:


which is part of JUCE 5.4.7. So you could consider upgrading.
9

Thanks!

10

Hey there, did you manage to make it work? Was it using CMake or by changing the toolchain in Visual Studio ? Can you explain the process? I wanted to set llvm as the compiler in a project generated by the Projucer but didn’t find how to do that in VS :confused:
Thanks!

1 Like
11

First install the LLVM tools for VS with the VS installer. Then in Configuration properties, General set Platform Toolset to LLVM (clang-cl). In the Librarian / Linker options disable Link Time Code Generation (LLVM doesn’t support it and it makes clang stop). You may need to enable extensions if you use them -I added -mavx -mfma to the compiler command line (in C/C++ options).