#!/bin/bash

# Slackware build script for llvm

# Copyright 2008-2016 Heinz Wiesinger, Amsterdam, The Netherlands
# Copyright 2012, 2013, 2014, 2015, 2016, 2018, 2019, 2020, 2021, 2022, 2023, 2024  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 llvmorg-*.tar.?z | rev | cut -f 3- -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=i686 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

# Select projects to build:
if [ "$ARCH" = "i586" -o "$ARCH" = "i686" ]; then
  # bolt and flang are not available on 32-bit
  LLVM_ENABLE_PROJECTS=${LLVM_ENABLE_PROJECTS:-"clang;clang-tools-extra;compiler-rt;lld;lldb;llvm;mlir;openmp;polly"}
else
  LLVM_ENABLE_PROJECTS=${LLVM_ENABLE_PROJECTS:-"bolt;clang;clang-tools-extra;compiler-rt;flang;lld;lldb;llvm;mlir;openmp;polly"}
fi

# Select runtimes to build:
LLVM_ENABLE_RUNTIMES=${LLVM_ENABLE_RUNTIMES:-"libcxx;libcxxabi"}

# 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-$PKGNAM
BUILDDIR=${TMP}/llvm-build-${VERSION}

# Ignore that which should be ignored to avoid long build times and
# massive warning spew:
IGNORE_GNU_EXTENSIONS=${IGNORE_GNU_EXTENSIONS:--Wno-unknown-warning-option -Wno-gnu-line-marker -Wno-gnu-anonymous-struct -Wno-gnu-include-next}

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686 $IGNORE_GNU_EXTENSIONS"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=pentium4 -mtune=generic $IGNORE_GNU_EXTENSIONS"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -march=x86-64 -mtune=generic -fPIC $IGNORE_GNU_EXTENSIONS"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2 $IGNORE_GNU_EXTENSIONS"
  LIBDIRSUFFIX=""
fi

# 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 /)

rm -rf $PKG $BUILDDIR
mkdir -p $TMP $PKG $BUILDDIR
cd $BUILDDIR

# Add a fake configure script so the cleanup script used here at Slackware
# knows to delete this stuff later. Other folks can just ignore this... it
# doesn't have any other purpose.
touch configure
chmod 755 configure

echo "Extracting $CWD/llvmorg-$VERSION.tar.?z..."
tar xf $CWD/llvmorg-$VERSION.tar.?z || exit 1
cd llvm-project-llvmorg-$VERSION || cd llvmorg-$VERSION || exit 1

# Support GCC built for i?86-slackware-linux:
zcat $CWD/clang.toolchains.32-bit.triple.diff.gz | patch -p2 --verbose || exit 1

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 \
    -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=${LIBDIRSUFFIX} \
    -DCMAKE_BUILD_TYPE=Release \
    -DLLVM_BUILD_LLVM_DYLIB=ON \
    -DLLVM_LINK_LLVM_DYLIB=ON \
    -DCLANG_LINK_CLANG_DYLIB=ON \
    -DLLVM_USE_LINKER=lld \
    -DLLVM_ENABLE_PROJECTS="$LLVM_ENABLE_PROJECTS" \
    -DLLVM_ENABLE_RUNTIMES="$LLVM_ENABLE_RUNTIMES" \
    -DLLVM_ENABLE_RTTI=ON \
    -DLLVM_ENABLE_FFI=ON \
    -DLLVM_ENABLE_ZLIB=ON \
    -DLLVM_ENABLE_ASSERTIONS=OFF \
    -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=NO \
    -DLLVM_INSTALL_UTILS=ON \
    -DLLVM_BINUTILS_INCDIR=/usr/include \
    -DCLANG_RESOURCE_DIR="../lib${LIBDIRSUFFIX}/clang/$(echo $VERSION | cut -f 1 -d .)" \
    -DLLVM_TARGETS_TO_BUILD="host;AMDGPU;BPF;WebAssembly" \
    -DLLVM_INCLUDE_BENCHMARKS=OFF \
    -DCOMPILER_RT_BUILD_LIBFUZZER=OFF \
    -DCLANG_DEFAULT_PIE_ON_LINUX=ON \
    -DLIBCXX_LIBDIR_SUFFIX=${LIBDIRSUFFIX} \
    -DLIBCXXABI_LIBDIR_SUFFIX=${LIBDIRSUFFIX} \
    -DLIBCXX_INCLUDE_BENCHMARKS=OFF \
    -DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=ON \
    -DLIBCXXABI_USE_LLVM_UNWINDER=OFF \
    ../llvm  || exit 1
  "${NINJA:=ninja}" $NUMJOBS || exit 1
  DESTDIR=$PKG "$NINJA" install || exit 1
cd ..

# 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

# Ensure lit-cpuid is installed:
if [ ! -r $PKG/usr/bin/lit-cpuid ]; then
  cp -a build/bin/lit-cpuid $PKG/usr/bin/lit-cpuid
  chown root:root $PKG/usr/bin/lit-cpuid
  chmod 755 $PKG/usr/bin/lit-cpuid
fi

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

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

# Remove bundled python-six:
rm -f "$PKG/usr/lib$LIBDIRSUFFIX/python2*/site-packages/six.py"

# Compile Python scripts:
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"
python3 -m compileall "$PKG/usr/share/scan-view"
python3 -O -m compileall "$PKG/usr/share/scan-view"
python3 -m compileall "$PKG/usr/share/clang"
python3 -O -m compileall "$PKG/usr/share/clang"
python3 -m compileall "$PKG/usr/share/opt-viewer"
python3 -O -m compileall "$PKG/usr/share/opt-viewer"

# Nevermind, we're not shipping this python2 crap:
rm -rf $PKG/usr/lib$LIBDIRSUFFIX/python2*

# 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

# Just copy anything top or next level that looks like it might be docs.
# Maybe we'll include it someday. ;-)
mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION
cp -a *.{txt,md,TXT,rst} $PKG/usr/doc/$PKGNAM-$VERSION
cp -a --parents */*.{txt,md,TXT,rst} $PKG/usr/doc/$PKGNAM-$VERSION
cp -a --parents */README* $PKG/usr/doc/$PKGNAM-$VERSION
find $PKG/usr/doc/$PKGNAM-$VERSION -name CMakeLists.txt -exec rm -f "{}" \;
rmdir $PKG/usr/doc/$PKGNAM-$VERSION/* 2> /dev/null

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

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