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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=$(grep -c proc /proc/cpuinfo)
PARALLEL=-j$CPUS
build_dir=$LLVM_BLD
install_dir=$LLVM_INSTALL
build_type=Release
shared=
targets=
dwarf=
prog=`basename $0`
syntax="Syntax: $prog [-jN] [targets]"
update=false
check=false
master=false
inst=false
minimal_targets="-DLLVM_TARGETS_TO_BUILD='ARM;X86;AArch64'"
link_jobs=
if [ "$1" = "-h" ]; then
echo $syntax
exit 0
fi
## Choose between make and ninja
make=make
generator="Unix Makefiles"
if which ninja > /dev/null 2>&1; then
make=ninja
generator="Ninja"
fi
## Debug mode, make it lighter
if [ "$LLVM_DEBUG" = true ]; then
build_type=Debug
shared=-DBUILD_SHARED_LIBS=True
# Disabling split-dwarf until we can be sure the relocation
# problems we're seeing aren't specific to this feature
# Error: R_ARM_ABS32 used with TLS symbol
#dwarf=-DLLVM_USE_SPLIT_DWARF=ON
targets=$minimal_targets
fi
# Building on ARM?
if grep -q "ARM.* Processor" /proc/cpuinfo; then
targets=$minimal_targets
if [ "$make" = "ninja" ]; then
link=$(free -g | awk '/Mem/ {print $2}')
if [ "$link" -gt "$CPUS" ]; then
link=$CPUS
else
link=$((link+1))
fi
link_jobs="-DLLVM_PARALLEL_LINK_JOBS=$link"
fi
fi
## Make sure sure build dir is there
if [ ! -d $build_dir ]; then
safe_run mkdir -p $build_dir
fi
cd $build_dir
## Allow the user to override the number of CPUs used with -jN
if [[ $1 =~ -j[0-9]+ ]]; then
PARALLEL=$1
shift
fi
## Re-run CMake if files are damaged / not there
if [ ! -f build.ninja ] && [ ! -f Makefile ]; then
echo " + Configuring Build"
safe_run cmake -G "$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 \
-DLLVM_LIT_ARGS="-sv $PARALLEL" \
-DCMAKE_CXX_FLAGS="-Wall" \
$targets $shared $link_jobs $dwarf $LLVM_CMAKE_FLAGS
fi
## Build
if [ "$1" == "" ]; then
echo " + Building LLVM"
safe_run $make $PARALLEL
else
for target in "$@"; do
echo " + Running $target"
safe_run $make $PARALLEL $target
done
fi
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