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#!/usr/bin/env bash

# This script helps you build LLVM. It can update the repositories first,
# run the check-all after and even install it in your system. Since the
# LLVM tree changes constantly, it's recommended that you run this script
# with update+check at least once a week, and most importantly, before you
# begin a big change, to make sure the repos are current and stable.

. llvm-common

safe_run verify_env

## CMD line options and defaults
CPUs=`grep -c proc /proc/cpuinfo`
build_dir=$LLVM_BLD
install_dir=$LLVM_INSTALL
build_type=Release
shared=
targets=
prog=`basename $0`
syntax="Syntax: $prog [targets]"
update=false
check=false
master=false
inst=false

if [ "$1" = "-h" ]; then
  echo $syntax
  exit 0
fi

## Choose between make and ninja
make=make
generator="Unix Makefiles"
if which ninja 2>&1 > /dev/null; then
  make=ninja
  generator="Ninja"
fi

## Debug mode, make it lighter
if [ "$LLVM_DEBUG" = true ]; then
  build_type=Debug
  shared=-DBUILD_SHARED_LIBS=True
  targets=-DLLVM_TARGETS_TO_BUILD="ARM;X86;AArch64"
fi

## Make sure sure build dir is there
if [ ! -d $build_dir ]; then
  safe_run mkdir -p $build_dir
fi
cd $build_dir

## Re-run CMake if files are damaged / not there
if [ ! -f build.ninja ] && [ ! -f Makefile ]; then
	echo " + Configuring Build"
  safe_run cmake -G "$generator" $LLVM_SRC \
            -DCMAKE_BUILD_TYPE=$build_type \
            -DLLVM_BUILD_TESTS=True \
            -DLLVM_ENABLE_ASSERTIONS=True \
            -DPYTHON_EXECUTABLE=/usr/bin/python2 \
            -DCMAKE_INSTALL_PREFIX=$install_dir \
            $targets $shared
fi

## Build
if [ "$1" == "" ]; then
  echo " + Building LLVM"
  safe_run $make -j$CPUs
else
  for target in "$@"; do
    echo " + Running $target"
    safe_run $make -j$CPUs $target
  done
fi