#!/bin/bash

# Slackware build script for llvm

# Copyright 2008-2016 Heinz Wiesinger, Amsterdam, The Netherlands
# Copyright 2012, 2013, 2014, 2015, 2016, 2018, 2019  Patrick J. Volkerding, Sebeka, MN, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

cd $(dirname $0) ; CWD=$(pwd)

PKGNAM=llvm
VERSION=${VERSION:-$(echo llvm-*.tar.xz | rev | cut -f 4- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-2}

NUMJOBS=${NUMJOBS:-" -j$(expr $(nproc) + 1) "}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
# the name of the created package would be, and then exit. This information
# could be useful to other scripts.
if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PKGNAM-$VERSION-$ARCH-$BUILD.txz"
  exit 0
fi

TMP=${TMP:-/tmp}
PKG=$TMP/package-$PKGNAM

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -march=znver1 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

# Python2 short version:
PY2=$(python -c 'from distutils.sysconfig import get_python_lib; print(get_python_lib())' | cut -f 2 -d n | cut -f 1 -d /)
# Python3 short version:
PY3=$(python3 -c 'from distutils.sysconfig import get_python_lib; print(get_python_lib())' | cut -f 2 -d n | cut -f 1 -d /)

# Sadly, glibc-2.30 exposed some sort of problem with clang and icecream.
# The symptom is a compile failure that says none of the types in
# <linux/types.h> are defined, even though they are. gcc/g++ seem unaffected.
# For now, not much choice other than to disable this.
# Don't use icecream:
PATH=$(echo $PATH | sed "s|/usr/libexec/icecc/bin||g" | tr -s : | sed "s/^://g" | sed "s/:$//g")

#clang/  clang-tools-extra/  compiler-rt/  debuginfo-tests/  libc/  libclc/  libcxx/  libcxxabi/  libunwind/  lld/  lldb/  llgo/  llvm/  openmp/  parallel-libs/  polly/  pstl/


rm -rf $PKG
mkdir -p $TMP $PKG
cd $TMP
rm -rf $PKGNAM-${VERSION}.src $PKGNAM-${VERSION}
tar xvf $CWD/$PKGNAM-$VERSION.src.tar.xz || exit 1

cd $PKGNAM-${VERSION}/tools || cd $PKGNAM-${VERSION}.src/tools || exit 1
  tar xvf $CWD/clang-$VERSION.src.tar.xz || exit 1
  mv clang-${VERSION} clang 2>/dev/null || mv clang-${VERSION}.src clang || exit 1
#  tar xvf $CWD/lldb-$VERSION.src.tar.xz || exit 1
#  mv lldb-${VERSION} lldb 2>/dev/null || mv lldb-${VERSION}.src lldb || exit 1
  tar xvf $CWD/lld-$VERSION.src.tar.xz || exit 1
  mv lld-${VERSION} lld 2>/dev/null || mv lld-${VERSION}.src lld || exit 1
cd ../

#cd tools/clang/tools || exit 1
#  tar xvf $CWD/clang-tools-extra-$VERSION.src.tar.xz || exit 1
#  mv clang-tools-extra-${VERSION} extra 2>/dev/null \
#    || mv clang-tools-extra-${VERSION}.src extra || exit 1
#cd ../../../

#cd projects || exit 1
#  tar xvf $CWD/compiler-rt-$VERSION.src.tar.xz || exit 1
#  mv compiler-rt-${VERSION} compiler-rt 2>/dev/null \
#    || mv compiler-rt-${VERSION}.src compiler-rt || exit 1
#  tar xvf $CWD/openmp-$VERSION.src.tar.xz || exit 1
#  mv openmp-${VERSION} openmp 2>/dev/null \
#    || mv openmp-${VERSION}.src openmp || exit 1
#  tar xvf $CWD/libcxx-${VERSION}.src.tar.xz || exit 1
#  mv libcxx-${VERSION} libcxx 2>/dev/null \
#    || mv libcxx-${VERSION}.src libcxx || exit 1
#  tar xvf $CWD/libcxxabi-${VERSION}.src.tar.xz || exit 1
#  mv libcxxabi-${VERSION} libcxxabi 2>/dev/null \
#    || mv libcxxabi-${VERSION}.src libcxxabi || exit 1
#cd ../








# Support GCC built for i586-slackware-linux:
zcat $CWD/clang.toolchains.i586.triple.diff.gz | patch -p1 --verbose || exit 1

# As of clang-tools-extra-7.0.0 we get the following error on i586 or i686:
# CMakeFiles/clangDaemon.dir/Trace.cpp.o:Trace.cpp:function std::unique_ptr<clang::clangd::trace::(anonymous namespace)::JSONTracer::JSONSpan, std::default_delete<clang::clangd::trace::(anonymous namespace)::JSONTracer::JSONSpan> >::~unique_ptr(): error: undefined reference to '__atomic_load_8'
# Attempts to try to fix this have failed here, so for now we will not build
# clangd to avoid the failure. Any help with a proper fix is appreciated.
# I have not reported this upstream since I suspect that it's an artifact
# of our convoluted build method.
case $ARCH in
  i?86) CLANGD="-DCLANG_ENABLE_CLANGD=OFF" ;;
     *) unset CLANGD ;;
esac


export CMAKE_BUILD_TYPE="Release"
export CMAKE_DEBUG_TRACE=0

#CLANGD="-DCLANG_ENABLE_CLANGD=ON"

chown -R root:root .
find . \
  \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 -o -perm 511 \) \
  -exec chmod 755 {} \+ -o \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \+

mkdir build
cd build
#  cmake -GNinja \

#  cmake \
#    -DCMAKE_C_COMPILER="clang" \
#    -DCMAKE_CXX_COMPILER="clang++" \
#    -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
#    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
#    -DCMAKE_INSTALL_PREFIX=/usr \
#    -DLLVM_LIBDIR_SUFFIX=${LIBDIRSUFFIX} \
#    -DCMAKE_BUILD_TYPE=Release \
#    -DBUILD_SHARED_LIBS=ON \
#    -DLLVM_USE_LINKER=gold \
#    -DLLVM_ENABLE_RTTI=ON \
#    -DLLVM_ENABLE_FFI=ON \
#    -DLLVM_ENABLE_ASSERTIONS=OFF \
#    -DLLVM_INSTALL_UTILS=ON \
#    -DLLVM_BINUTILS_INCDIR=/usr/include \
#    -DCLANG_RESOURCE_DIR="../lib${LIBDIRSUFFIX}/clang/${VERSION}" \
#    -DLLVM_TARGETS_TO_BUILD="X86;AMDGPU" \
#    $CLANGD \
#    ..  || exit 1

#  "${NINJA:=ninja}" $NUMJOBS || exit 1
#  DESTDIR=$PKG "$NINJA" install || exit 1


export TARGETS="AMDGPU;X86"
  cmake -DCMAKE_BUILD_TYPE="Release" \
  -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
  -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
  -DCMAKE_INSTALL_PREFIX=/usr \
  -DLLVM_LIBDIR_SUFFIX=${LIBDIRSUFFIX} \
  -DLLVM_TARGETS_TO_BUILD=${TARGETS} \
  -DLLVM_BINUTILS_INCDIR=/usr/include \
  -DCLANG_RESOURCE_DIR="../lib${LIBDIRSUFFIX}/clang/${VERSION}" \
  -DLLVM_USE_LINKER=gold -DLLVM_ENABLE_ASSERTIONS=No .. || exit 1


unset TARGETS

    make $NUMJOBS || exit 1
    DESTDIR=$PKG make install || exit 1

cd ..


unset CMAKE_BUILD_TYPE
unset CMAKE_DEBUG_TRACE


#-DLLVM_TARGETS_TO_BUILD="host;AMDGPU;BPF" \


# Add symlinks for $ARCH-slackware-linux-{clang,clang++}:
( cd $PKG/usr/bin
  ln -sf clang $ARCH-slackware-linux-clang
  ln -sf clang++ $ARCH-slackware-linux-clang++
)

# install clang-static-analyzer
for i in ccc c++; do
  ln -s /usr/libexec/$i-analyzer \
    $PKG/usr/bin/$i-analyzer || exit 1
done

# Remove symlink to libgomp, which is already provided by gcc
rm -f $PKG/usr/lib$LIBDIRSUFFIX/libgomp.so

# Install Python bindings
for pyver in ${PY2} ${PY3}; do
  mkdir -p "$PKG/usr/lib$LIBDIRSUFFIX/python$pyver/site-packages"
  cp -a tools/clang/bindings/python/clang "$PKG/usr/lib$LIBDIRSUFFIX/python$pyver/site-packages/"
done

# Remove bundled python-six
rm -f "$PKG/usr/lib$LIBDIRSUFFIX/python${PY2}/site-packages/six.py"

# Compile Python scripts
python -m compileall "$PKG/usr/lib$LIBDIRSUFFIX/python${PY2}/site-packages/clang"
python -O -m compileall "$PKG/usr/lib$LIBDIRSUFFIX/python${PY2}/site-packages/clang"
python3 -m compileall "$PKG/usr/lib$LIBDIRSUFFIX/python${PY3}/site-packages/clang"
python3 -O -m compileall "$PKG/usr/lib$LIBDIRSUFFIX/python${PY3}/site-packages/clang"

#python -m compileall "$PKG/usr/lib$LIBDIRSUFFIX/python${PY2}/site-packages/lldb"
#python -O -m compileall "$PKG/usr/lib$LIBDIRSUFFIX/python${PY2}/site-packages/lldb"

python -m compileall "$PKG/usr/share/scan-view"
python -O -m compileall "$PKG/usr/share/scan-view"
python -m compileall "$PKG/usr/share/clang"
python -O -m compileall "$PKG/usr/share/clang"
python -m compileall "$PKG/usr/share/opt-viewer"
python -O -m compileall "$PKG/usr/share/opt-viewer"

# Move man page directory:
mv $PKG/usr/share/man $PKG/usr/

# Strip binaries:
( cd $PKG
  find . | xargs file | grep "executable" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
  find . | xargs file | grep "shared object" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
)

# Compress manual pages:
find $PKG/usr/man -type f -exec gzip -9 {} \+
for i in $( find $PKG/usr/man -type l ) ; do
  ln -s $( readlink $i ).gz $i.gz
  rm $i
done

#mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION/{clang,lldb,clang-tools-extra,compiler-rt,openmp}

mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION/clang
cp -a CREDITS* LICENSE* README* $PKG/usr/doc/$PKGNAM-$VERSION
cp -a tools/clang/{INSTALL,LICENSE,NOTES,README}* \
  $PKG/usr/doc/$PKGNAM-$VERSION/clang

#cp -a tools/lldb/{CODE_OWNERS,INSTALL,LICENSE}* \
#  $PKG/usr/doc/$PKGNAM-$VERSION/lldb

#cp -a tools/clang/tools/extra/{CODE_OWNERS,LICENSE,README}* \
#  $PKG/usr/doc/$PKGNAM-$VERSION/clang-tools-extra
#cp -a projects/compiler-rt/{CODE_OWNERS,CREDITS,LICENSE,README}* \
#  $PKG/usr/doc/$PKGNAM-$VERSION/compiler-rt
#cp -a projects/openmp/{CREDITS,LICENSE}* \
#  $PKG/usr/doc/$PKGNAM-$VERSION/openmp
mv $PKG/usr/docs/llvm/* $PKG/usr/doc/$PKGNAM-$VERSION
rm -rf $PKG/usr/docs

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $TMP/$PKGNAM-$VERSION-$ARCH-$BUILD.txz