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How to Build LLVM

Recommended setting:

Prerequisites

  • python3: required for running scripts
  • git: required for cloning repos
  • cmake3, ninja, g++: required for building repos
# Ubuntu:
apt update
apt install git cmake ninja-build g++

We'll use https://github.com/aqjune/llvmscript. Please clone the repo first.

git clone git@github.com:aqjune/llvmscript.git
# If it raises permission denied error, try 'git clone https://github.com/aqjune/llvmscript.git' instead
cd llvmscript

Clone LLVM:

# Please edit "src" attribute at examples/llvm.json to specify where to clone LLVM project
python3 run.py clone --cfg examples/llvm.json

Build LLVM:

python3 run.py build --cfg examples/llvm.json --type release --core <# of cores to use>
# --type:
#   release: fast build, has no debug info
#   debug: slow build, large binaries; can debug llvm with gdb/lldb
#   relassert: fast build, enables assertion checks
# NOTE: if it aborts due to insufficient memory space, please re-try with
#       smaller number of cores (it will restart compiling from the last status)

Troubleshootings

  • If an error message says it cannot find distutil.spawn, please install python3-distutils (Ubuntu: apt install python3-distutils)

  • If it fails with this error message, please remove compiler-rt from llvm.json:

CMake Error at (llvm 경로)/compiler-rt/test/builtins/CMakeLists.txt:55 (message):
  Target clang_rt.builtins_x86_64_osx does not exist