#!/bin/bash
# libgccjit Slackware package build script
# I have derived this script from the GCC build script written by volkerdi@slackware.com and
# modified by others. For this reason I keep as-is below the copyright notice of the GCC build 
# script and the following notes - Didier Spaier

# Copyright 2003, 2004  Slackware Linux, Inc., Concord, California, USA
# Copyright 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2021  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.

# Modified 2011 by Eric Hameleers <alien at slackware.com> for OpenJDK.

# Some notes, Fri May 16 12:31:32 PDT 2003:
#
# Why i486 and not i386?  Because the shared C++ libraries in gcc-3.2.x will
# require 486 opcodes even when a 386 target is used (so we already weren't
# compatible with the i386 for Slackware 9.0, didn't notice, and nobody
# complained :-).  gcc-3.3 fixes this issue and allows you to build a 386
# compiler, but the fix is done in a way that produces binaries that are not
# compatible with gcc-3.2.x compiled binaries.  To retain compatibility with
# Slackware 9.0, we'll have to use i486 (or better) as the compiler target
# for gcc-3.3.
#
# It's time to say goodbye to i386 support in Slackware.  I've surveyed 386
# usage online, and the most common thing I see people say when someone asks
# about running Linux on a 386 is to "run Slackware", but then they also 
# usually go on to say "be sure to get an OLD version, like 4.0, before glibc,
# because it'll be more efficient."  Now, if that's the general advice, then
# I see no reason to continue 386 support in the latest Slackware (and indeed
# it's no longer easily possible).

# Some more notes, Mon Aug  3 19:49:51 UTC 2015:
#
# Changing to -march=i586 for 32-bit x86 as several things (Mesa being one of
# them) no longer work if constrained to -march=i486.  We're not going to use
# -march=i686 since the only additional opcode is CMOV, which is actually less
# efficient on modern CPUs running in 32-bit mode than the alternate i586
# instructions.  No need to throw i586 CPUs under the bus (yet).

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

PKGNAM=libgccjit
SRCNAM=gcc
SRCVER=${VERSION:-$(echo $SRCNAM-*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
VERSION=$(echo $SRCVER | cut -f 1 -d _)
BUILD=2slint

# 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

# Temporary build location (this what I use for Slint, edit that as you see fit - Didier) :
TMP=$CWD

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

# This is the main DESTDIR target:
PKG=$TMP/package-libgccjit

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

cd gcc-$SRCVER || exit 1

# Smite the fixincludes:
zcat $CWD/patches/gcc-no_fixincludes.diff.gz | patch -p1 --verbose --backup --suffix=.orig || exit 1

# Fix a gfortran bug:
zcat $CWD/patches/gfortran.deferred-shape-vs-assumed-shape.patch.gz | patch -p0 --verbose --backup --suffix=.orig || exit 1

# Fix regressions in 10.3.0 (and presumably 11.1.0 since they still apply cleanly):
zcat $CWD/patches/PR100102-2.a1b3484a8e6c53c8084723e3f1738d402374198e.patch.gz | patch -p1 --verbose --backup --suffix=.orig || exit 1

# Fix compiler error in gcc-go
# https://github.com/golang/go/issues/47771
zcat $CWD/patches/7185690.diff.gz | patch -p1 --verbose --backup --suffix=.orig || 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 {} \+

# Install slack-desc and docs:
mkdir -p $PKG/install
mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION $PKG/install
cp -a \
  COPYING* gcc/ONEWS README INSTALL LAST_UPDATED \
$PKG/usr/doc/$PKGNAM-$VERSION
cp $CWD/slack-desc $PKG/install/

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

  # I think it's incorrect to include this option (as it'll end up set
  # to i586 on x86 platforms), and we want to tune the binary structure
  # for i686, as that's where almost all of the optimization speedups
  # are to be found.
  # Correct me if my take on this is wrong.
  #  --with-cpu=$ARCH 
 
  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
  rm -rf usr/bin usrlib64/gcc usr/libexec usr/man usr/info/dir
  ( cd usr/info
    gzip -9 *
  )
  makepkg -l y -c n $TMP/libgccjit-$VERSION-$ARCH-$BUILD.txz
)

echo
echo "Package $PKGNAM complete!"
echo