What are the steps to build LLVM from source for Ubuntu Bionic Beaver? - llvm

Question

Not all Kaleidoscope examples compile. Some do.
In the build process of LLVM Cmake complains "- Failed to find LLVM FileCheck"
My interest is in developing a toy compiler using LLVM - on a Ubuntu Bionic Beaver laptop, 64 bit. Therefore I needed to compile LLVM from source. The documentation says Cmake, gcc/g++, clang and zlib are required for the build. Yes, that is true. I found out the hard way this list is incomplete.
sudo apt update
sudo apt upgrade
sudo apt install -y cmake gcc g++ python build-essential opam ocaml
sudo apt install -y checkinstall python-pygments python-yaml llvm
opam init /* and say yes to creating a profile
opam config env
opam install ctypes ctypes-foreign
opam depext conf-llvm.6.0.0 /* and said Y to install
opam depext conf-m4.1 /* and said Y to install
opam depext conf-pkg-config.1.1 /* and said Y to install
sudo apt install libxml2-dev libplist-dev
sudo apt install llvm-7-tools
/*the z3 package is outdated, need to build from source:
mkdir z3 /*somewhere
git clone https://github.com/Z3Prover/z3
python scripts/mk_make.py
cd build
make
sudo checkinstall /* y and enter
cd <to sourceroot of llvm>
git clone https://github.com/llvm/llvm-project.git
cd llvm-project
mkdir build; cd build
cmake -DLLVM_TARGETS_TO_BUILD="X86" -DCMAKE_BUILD_TYPE=Release ../llvm
make -j2
Kaleidoscope examples from Chapters 3 and 8 compile fine. The output from the toy compiler resulting from Chapter 8 even does compile and link to a working program. The examples from the Chapters 2, 4, 5, 6, 7 and 9 don't compile.

Answer 1

You also need googletest as a shared library with current source code (27-04-2019) for it to compile. It is not stated as a requirement which was very frustrating when I had errors building llvm, clang, lld and clang extra tools.
Best place for the current code is: github.com/google/googletest
The best answer for how to build googletest is here