Dlang LLVM Wrapper Library

Features

Requirements

• Dlang https://dlang.org/
• LLVM 13 http://llvm.org/

LLVM .lib files are required (statically compiled).

Generating the LLVM .lib files (On Windows)

Required software: python 3, cmake, visual studio

1. Download the source from the LLVM website to c:\temp\llvm

2. create a 'build' directory eg. c:\temp\llvm\build

3. Use a command prompt with visual studio vars setup

4. Edit CMakeLists.txt:

   • Change LLVM_TARGETS_TO_BUILD from "all" to X86 (Unless you need other targets)

5. cd \temp\llvm\build

6. cmake -G "Visual Studio 16 2019" -A x64 c:\temp\llvm

7. Open the Visual Studio .sln file in the build directory

8. Set to Release build

9. Add code:

   • Libraries/LLVMCore/Core.cpp

   extern "C" {
       void LLVMSetFastMath(LLVMBuilderRef Builder, bool fast = true) {
         auto fmf = FastMathFlags();
         fmf.setFast(fast);
         unwrap(Builder)->setFastMathFlags(fmf);
       }
   }
   

10. Set everything to C/C++/Code Generation/Runtime Library = /MT (static multithreaded)

    Ignore these files:

    • Examples/Kaleidoscope

    • Loadable Modules/*

    • Misc/*

    • Tablegenning/*

    • Tests/check

    • Tests/check-lit

    • Tests/check-llvm

    • Tests/llvm-test-depends

    • Tests/prepare-check-lit

    • Tests/test-depends

    • Tests/TestPlugin

    • Tests/UnitTests

    • Tools/llvm-addr2line

    • Tools/llvm-bitcode-strip

    • Tools/llvm-dlltool

    • Tools/llvm-install-name-tool

    • Tools/llvm-lib

    • Tools/llvm-locstats

    • Tools/llvm-otool

    • Tools/llvm-ranlib

    • Tools/llvm-readelf

    • Tools/llvm-strip

    • Tools/llvm-windres

    • Utils/LLVMVisualizers

11. Rebuild ALL-BUILD

12. Copy the lib files from build\Release\lib to somwehere safe and point to them in the dub.sdl file (lflags).