#!/bin/bash
# "gwh-ified" based on http://slackware.uk/slint/x86_64/slint-15.0/source/libgccjit/

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

PKGNAM=$(basename "$CWD")
BUILD=${BUILD:-2}
TAG=${TAG:-gwh}

OFFICIAL_GCC_SRC_PATH=${OFFICIAL_GCC_SRC_PATH:-/home/installs/mirrors/slackware64-current/source/d/gcc/}
SRCNAM=gcc
SRCVER=${VERSION:-$(echo $OFFICIAL_GCC_SRC_PATH/$SRCNAM-*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
VERSION=$(echo $SRCVER | cut -f 1 -d _)

TMP=${TMP:-/tmp/$TAG}
OUTPUT=${OUTPUT:-/tmp}

# This is the main DESTDIR target:
PKG=$TMP/pkg-$PKGNAM

# How many jobs to run in parallel:
NUMJOBS=${NUMJOBS:-" -j$(expr $(nproc) + 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

if [ "$ARCH" = "i386" ]; then
  SLKCFLAGS="-O2 -march=i386 -mcpu=i686"
  LIBDIRSUFFIX=""
  LIB_ARCH=i386
elif [ "$ARCH" = "i486" ]; then
  SLKCFLAGS="-O2 -march=i486 -mtune=i686"
  LIBDIRSUFFIX=""
  LIB_ARCH=i386
elif [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
  LIB_ARCH=i386
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686"
  LIBDIRSUFFIX=""
  LIB_ARCH=i386
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
  LIB_ARCH=s390
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
  LIB_ARCH=amd64
elif [ "$ARCH" = "armv7hl" ]; then
  SLKCFLAGS="-O3 -march=armv7-a -mfpu=vfpv3-d16"
  LIBDIRSUFFIX=""
  LIB_ARCH=armv7hl
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
  LIB_ARCH=$ARCH
fi

case "$ARCH" in
    arm*) TARGET=$ARCH-slackware-linux-gnueabi ;;
    *)    TARGET=$ARCH-slackware-linux ;;
esac

# Extract the source code:
mkdir -p $TMP
cd $TMP || exit 1
rm -rf gcc-$SRCVER
tar xf $OFFICIAL_GCC_SRC_PATH/gcc-$SRCVER.tar.?z || exit 1

# Clear the build locations:
rm -rf $PKG
mkdir $PKG

cd gcc-$SRCVER || exit 1

# Fix perms/owners:
chown -R root:root .
find . \
  \( -perm 777 -o -perm 775 -o -perm 754 \) \
  -exec chmod 755 {} \+ -o \
  \( -perm 664 \) \
  -exec chmod 644 {} \+

mkdir -p $PKG/usr/doc/$PKGNAM
cp -a \
   COPYING* gcc/ONEWS README INSTALL LAST_UPDATED \
   $PKG/usr/doc/$PKGNAM

mkdir gcc.build.lnx
cd gcc.build.lnx

if [ "$ARCH" != "x86_64" ]; then
  GCC_ARCHOPTS="--with-arch=$ARCH"
else
  GCC_ARCHOPTS="--disable-multilib"
fi

CFLAGS="$SLKCFLAGS" \
      CXXFLAGS="$SLKCFLAGS" \
      ../configure --prefix=/usr \
      --libdir=/usr/lib$LIBDIRSUFFIX \
      --mandir=/usr/man \
      --infodir=/usr/info \
      --enable-shared \
      --enable-host-shared \
      --enable-bootstrap \
      --enable-languages=jit \
      --enable-threads=posix \
      --enable-checking=release \
      --enable-objc-gc \
      --with-system-zlib \
      --enable-libstdcxx-dual-abi \
      --with-default-libstdcxx-abi=new \
      --disable-libstdcxx-pch \
      --disable-libunwind-exceptions \
      --enable-__cxa_atexit \
      --disable-libssp \
      --enable-gnu-unique-object \
      --enable-plugin \
      --enable-lto \
      --disable-install-libiberty \
      --disable-werror \
      --with-gnu-ld \
      --with-isl \
      --verbose \
      --with-arch-directory=$LIB_ARCH \
      --disable-gtktest \
      --enable-clocale=gnu \
      $GCC_ARCHOPTS \
      --target=${TARGET} \
      --build=${TARGET} \
      --host=${TARGET} || exit 1

make $NUMJOBS bootstrap || exit 1
make -C gcc DESTDIR="$PKG" jit.install-common jit.install-info
find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

cd $PKG || exit 1
rm -rf usr/bin usrlib64/gcc usr/libexec usr/man usr/info/dir
cd usr/info
gzip -9 *

cd $PKG || exit 1
mkdir -p install/
cat <<EOF > install/slack-desc
# HOW TO EDIT THIS FILE:
# The "handy ruler" below makes it easier to edit a package description. Line
# up the first '|' above the ':' following the base package name, and the '|' on
# the right side marks the last column you can put a character in. You must make
# exactly 11 lines for the formatting to be correct. It's also customary to
# leave one space after the ':'.

         |-----handy-ruler------------------------------------------------------|
libgccjit: libgccit (Just In Time Compilation: shared library and header files.)
libgccjit:
libgccjit: GCC can be built as a shared library "libgccjit.so", for generating
libgccjit: machine code from API calls, using GCC as the backend.
libgccjit: This shared library can then be dynamically-linked into bytecode
libgccjit: interpreters and other such programs that want to generate machine
libgccjit: code "on the fly" at run-time. It can also be used for ahead-of-time
libgccjit: code generation, for building standalone compilers (so the "jit"
libgccjit: part of the name is now something of a misnomer).
libgccjit: The library provides a C API, along with a C++ wrapper API, with
libgccjit: bindings for languages available from 3rd parties
libgccjit:
EOF

makepkg --linkadd y --chown n --prepend $OUTPUT/$PKGNAM-$VERSION-$ARCH-$BUILD$TAG.txz