Bug 20405 – pipelink.exe ignores LLVMInstallDir property when lld-link.exe is used.

Visual Studio allows the location of lld-link.exe to be overridden with the "LLVMInstallDir" property. Although pipelink.exe now delegates to the correct linker, it ignores this property. This is particularly problematic as in some cases the 32-bit linker that visual studio provides cannot allocate enough memory. Related to https://issues.dlang.org/show_bug.cgi?id=20387.

I don't find LLVMInstallDir anywhere being used in the VS 2019 installation folders (it is defined in Microsoft.Cpp.Default.props, though). Does it need some special components to be installed? Where do you change/apply this setting?

Thanks for looking into this! It needs the Microsoft.VisualStudio.Component.VC.Llvm.ClangToolset component (C++ Clang-cl for v142 build tools). There's no GUI setting for it, you just have to set it in a property group in a project file or a props file. It needs to be set after Microsoft.Cpp.Default.props is loaded. It's mentioned here: https://devblogs.microsoft.com/cppblog/clang-llvm-support-for-msbuild-projects/

Works as expected here: - installed the clang components - renamed the VC\Tools\LLVM - switched test project to use clang toolchain (has both cpp and d sources) - added property to set LLVMInstallDir (before importing Microsoft.Cpp.props) - build project -> runs lld-link.exe through pipelink.exe successfully (can be seen in pipelink.read.1.tlog) What's different in your setup?

You're absolutely right, I'm not sure why I didn't manage to get that working before. Sorry to waste your time!