Visual Studio 2019 - ClangCl Toolset - LTCG flag

[Xav83]

Hi @McMartin ,

In our project, we have been experimenting with clangCl as a toolset of Visual Studio 2019 to compile our project with clang on Windows. Everything seems to work well, except for the flag /LTCG which triggers an error since it doesn't exist for clang. 😢

Since, we have only been experimenting with clangCl, disabling the flag manually in Visual Studio was good for us. Regardless, I want to report this to you, because it may come from the cmake code below:

https://github.com/McMartin/FRUT/blob/37dc1a713d5ebe0e03219483f81e4aa128b410c0/cmake/Reprojucer.cmake#L5565-L5569

https://github.com/McMartin/FRUT/blob/37dc1a713d5ebe0e03219483f81e4aa128b410c0/cmake/Reprojucer.cmake#L5587-L5592

https://github.com/McMartin/FRUT/blob/37dc1a713d5ebe0e03219483f81e4aa128b410c0/cmake/Reprojucer.cmake#L5601-L5606

To be sure, before submitting this issue, I have set the variable ltcg_link_flag to an empty string, and remove the others /LTCG, and then everything compiled fine with the toolset clangCl 🙂

I hope this help you enhance FRUT support on Visual Studio 2019 🙂

Have a great day 😄

[McMartin]

Hi @Xav83,

I'm currently installing the Clang for Windows component of Visual Studio 2019. I'll give this a try and report back!

[McMartin]

@Xav83 I can't reproduce the error 😅 Which version of CMake are you using and what arguments are you passing to it exactly? Could you please also share the output of calling cmake in a new binary directory, when it detects the C/CXX compiler and its features? Thanks!