Compiling LevelDB as LLVM binary on Linux

Some time ago I wrote a guide on how to compile and install LevelDB on Linux.

Recently I’m desperately trying to get into LLVM and a tutorial series on how to use LLVM with C/C++ is coming shortly.

As I’m using LevelDB in many of my projects I’d like a way of generating a LLVM IR (intermediate representation) of the LevelDB C++ source – I could link a LLVM program to the native binary, but in order to profit from LLVMs features I suppose using IRs for as many dependencies as possible is the way to go.

Generally there are two ways to go:

  1. Use the g++ LLVM backend
  2. Use clang++

I usually tend to use clang++ for LLVM tasks because even with colorgcc and some recent improvements in gcc error message generation I prefer the clang++ error messages, even if I have way more experience with gcc error messages. Additionally the g++ with LLVM backend does seem to have some bugs, including interpreting -emit-llvm as -e -m -i …, plus recent distribution versions don’t work too well with the LLVM gold plugin and it has proved difficult to tell GCC reliably that it shall use llvm-ld as linker.

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