#!/bin/bash

# Copyright 2026 Heinz Wiesinger, Amsterdam, The Netherlands
# 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=intel-graphics-compiler
VERSION=${VERSION:-$(echo $PKGNAM-*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-1}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$(uname -m)" in
    i?86) ARCH=i586 ;;
    arm*) readelf /usr/bin/file -A | egrep -q "Tag_CPU.*[4,5]" && ARCH=arm || ARCH=armv7hl ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
    *) ARCH=$(uname -m) ;;
  esac
  export ARCH
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

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

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "armv7hl" ]; then
  SLKCFLAGS="-O3 -march=armv7-a -mfpu=vfpv3-d16"
  LIBDIRSUFFIX=""
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

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

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

cd $TMP
rm -rf $PKGNAM-$VERSION
tar xvf $CWD/$PKGNAM-$VERSION.tar.?z || exit 1
cd $PKGNAM-$VERSION || exit 1

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

# The system LLVM is built without LLVM_ENABLE_DUMP, so Module::dump() doesn't
# exist (from Gentoo):
zcat $CWD/intel-graphics-compiler-guard-debug.patch.gz | patch -p1 --verbose || exit 1

# Don't turn new compiler warnings into build failures:
sed -i 's/^        TreatWarnAsErrorEnabled$/        TreatWarnAsErrorDisabled/' IGC/CMakeLists.txt

# Build against the system LLVM, clang, LLD, SPIR-V translator, SPIRV-Tools and
# SPIRV-Headers, and the opencl-clang and vc-intrinsics packages, rather than
# IGC building its own patched copies of them (the way Gentoo does). Upstream
# carries a few LLVM patches for its own builds, which are missing here.
# -z undefs is from Gentoo, see:
# https://github.com/intel/intel-graphics-compiler/issues/212
LLVM_VERSION=$(llvm-config --version)
LLVM_MAJOR=$(llvm-config --version | cut -f 1 -d .)
mkdir cmake-build
cd cmake-build
  LDFLAGS="-Wl,-z,undefs" \
  cmake \
    -DCMAKE_CXX_FLAGS="${SLKCFLAGS}" \
    -DCMAKE_C_FLAGS="${SLKCFLAGS}" \
    -DCMAKE_INSTALL_PREFIX="/usr" \
    -DCMAKE_INSTALL_LIBDIR="lib${LIBDIRSUFFIX}" \
    -DCMAKE_BUILD_TYPE=Release \
    -DBUILD_SHARED_LIBS=OFF \
    -DCCLANG_FROM_SYSTEM=ON \
    -DIGC_OPTION__ARCHITECTURE_TARGET=Linux64 \
    -DIGC_OPTION__CLANG_MODE=Prebuilds \
    -DIGC_OPTION__LLD_MODE=Prebuilds \
    -DIGC_OPTION__LLVM_MODE=Prebuilds \
    -DIGC_OPTION__LLVM_PREFERRED_VERSION="${LLVM_VERSION}" \
    -DIGC_OPTION__OPENCL_HEADER_PATH="/usr/lib${LIBDIRSUFFIX}/clang/${LLVM_MAJOR}/include/opencl-c.h" \
    -DIGC_OPTION__SPIRV_TOOLS_MODE=Prebuilds \
    -DIGC_OPTION__SPIRV_TRANSLATOR_MODE=Prebuilds \
    -DIGC_OPTION__VC_INTRINSICS_MODE=Prebuilds \
    -DIGC_OPTION__USE_PREINSTALLED_SPIRV_HEADERS=ON \
    -DIGC_OPTION__LINK_KHRONOS_SPIRV_TRANSLATOR=ON \
    -DIGC_OPTION__ENABLE_BF16_BIF=ON \
    -DSPIRVLLVMTranslator_INCLUDE_DIR=/usr/include/LLVMSPIRVLib \
    -Wno-dev \
    .. || exit 1

  make $NUMJOBS || exit 1
  make install/strip DESTDIR=$PKG || exit 1
cd ..

mkdir -p $PKG/usr/doc/${PKGNAM}-$VERSION
cp -a \
  LICENSE.md README.md SECURITY.md \
  $PKG/usr/doc/${PKGNAM}-$VERSION

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