#!/bin/sh
# APPLE LOCAL file ARM libgcc
# This is a pared-down version of build_gcc that builds all non-native
# TARGETS ($2) and then creates a destination directory containing only
# the libgcc files for those TARGETS.  Currently only designed to
# support ARM.

set -x

# -arch arguments are different than configure arguments. We need to
# translate them.

TRANSLATE_ARCH="sed -e s/ppc/powerpc/ -e s/i386/i686/ -e s/armv6/arm/"

# Build GCC the "Apple way".
# Parameters:

# The first parameter is a space-separated list of the architectures
# the compilers will run on.  For instance, "ppc i386".  If the
# current machine isn't in the list, it will (effectively) be added.
HOSTS=`echo $1 | $TRANSLATE_ARCH `

# The second parameter is a space-separated list of the architectures the
# compilers will generate code for.  If the current machine isn't in
# the list, a compiler for it will get built anyway, but won't be
# installed.
TARGETS=`echo $2 | $TRANSLATE_ARCH`

# The B&I build srcript (~rc/bin/buildit) accepts an '-othercflags'
# command-line flag, and captures the argument to that flag in
# $RC_NONARCH_CFLAGS (and mysteriously prepends '-pipe' thereto).
# We will allow this to override the default $CFLAGS and $CXXFLAGS.

CFLAGS="-g -O2 ${RC_NONARCH_CFLAGS/-pipe/}"

# This isn't a parameter; it is the architecture of the current machine.
BUILD=`arch | $TRANSLATE_ARCH`

# The third parameter is the path to the compiler sources.  There should
# be a shell script named 'configure' in this directory.  This script
# makes a copy...
ORIG_SRC_DIR="$3"

# The fourth parameter is the location where the compiler will be installed,
# normally "/usr".  You can move it once it's built, so this mostly controls
# the layout of $DEST_DIR.
DEST_ROOT="$4"

# The fifth parameter is the place where the compiler will be copied once
# it's built.
DEST_DIR="$5"

# The current working directory is where the build will happen.
# It may already contain a partial result of an interrupted build,
# in which case this script will continue where it left off.
DIR=`pwd`

# This isn't a parameter; it's the version of the compiler that we're
# about to build.  It's included in the names of various files and
# directories in the installed image.
VERS=`cat $ORIG_SRC_DIR/gcc/BASE-VER`
if [ -z "$VERS" ]; then
    exit 1
fi

# This isn't a parameter either, it's the major version of the compiler
# to be built.  It's VERS but only up to the second '.' (if there is one).
MAJ_VERS=`echo $VERS | sed 's/\([0-9]*\.[0-9]*\)[.-].*/\1/'`

# For ARM, grab all system files from an SDK.
ARM_SYSROOT="/Developer/SDKs/Extra"
ARM_CONFIGFLAGS="--with-sysroot=\"$ARM_SYSROOT\""

# This is the libstdc++ version to use.
LIBSTDCXX_VERSION=4.0.0

DARWIN_VERS=`uname -r | sed 's/\..*//'`
echo DARWIN_VERS = $DARWIN_VERS

# If the user has CC set in their environment unset it now
unset CC

########################################
# Run the build.

# Create the source tree we'll actually use to build, deleting
# tcl since it doesn't actually build properly in a cross environment
# and we don't really need it.
SRC_DIR=$DIR/src
rm -rf $SRC_DIR || exit 1
mkdir $SRC_DIR || exit 1
ln -s $ORIG_SRC_DIR/* $SRC_DIR/ || exit 1
rm -rf $SRC_DIR/tcl $SRC_DIR/expect $SRC_DIR/dejagnu || exit 1
# Also remove libstdc++ since it is built from a separate project.
rm -rf $SRC_DIR/libstdc++-v3 || exit 1
# Clean out old specs files
rm -f /usr/lib/gcc/*/4.0.0/specs

# These are the configure and build flags that are used.
CONFIGFLAGS="--disable-checking -enable-werror \
  --prefix=$DEST_ROOT \
  --mandir=\${prefix}/share/man \
  --enable-languages=c,objc,c++,obj-c++ \
  --program-transform-name=/^[cg][^.-]*$/s/$/-$MAJ_VERS/ \
  --with-gxx-include-dir=\${prefix}/include/c++/$LIBSTDCXX_VERSION \
  --with-slibdir=/usr/lib \
  --build=$BUILD-apple-darwin$DARWIN_VERS"

# Figure out how many make processes to run.
SYSCTL=`sysctl -n hw.activecpu`

# hw.activecpu only available in 10.2.6 and later
if [ -z "$SYSCTL" ]; then
  SYSCTL=`sysctl -n hw.ncpu`
fi

# sysctl -n hw.* does not work when invoked via B&I chroot /BuildRoot.
# Builders can default to 2, since even if they are single processor,
# nothing else is running on the machine.
if [ -z "$SYSCTL" ]; then
  SYSCTL=2
fi

# The $LOCAL_MAKEFLAGS variable can be used to override $MAKEFLAGS.
MAKEFLAGS=${LOCAL_MAKEFLAGS-"-j $SYSCTL"}

# Build the native GCC.  Do this even if the user didn't ask for it
# because it'll be needed for the bootstrap.
mkdir -p $DIR/obj-$BUILD-$BUILD $DIR/dst-$BUILD-$BUILD || exit 1
cd $DIR/obj-$BUILD-$BUILD || exit 1
if [ \! -f Makefile ]; then
 $SRC_DIR/configure $bootstrap $CONFIGFLAGS \
   --host=$BUILD-apple-darwin$DARWIN_VERS --target=$BUILD-apple-darwin$DARWIN_VERS || exit 1
fi
# Unset RC_DEBUG_OPTIONS because it causes the bootstrap to fail.
# Also keep unset for cross compilers so that the cross built libraries are
# comparable to the native built libraries.
unset RC_DEBUG_OPTIONS
make $MAKEFLAGS CFLAGS="$CFLAGS" CXXFLAGS="$CFLAGS" || exit 1
make $MAKEFLAGS html CFLAGS="$CFLAGS" CXXFLAGS="$CFLAGS" || exit 1
make $MAKEFLAGS DESTDIR=$DIR/dst-$BUILD-$BUILD install-gcc install-target \
  CFLAGS="$CFLAGS" CXXFLAGS="$CFLAGS" || exit 1

# Add the compiler we just built to the path, giving it appropriate names.
D=$DIR/dst-$BUILD-$BUILD/usr/bin
ln -f $D/gcc-$MAJ_VERS $D/gcc || exit 1
ln -f $D/gcc $D/$BUILD-apple-darwin$DARWIN_VERS-gcc || exit 1
PATH=$DIR/dst-$BUILD-$BUILD/usr/bin:$PATH
# The cross-tools' build process expects to find certain programs
# under names like 'i386-apple-darwin$DARWIN_VERS-ar'; so make them.
# Annoyingly, ranlib changes behaviour depending on what you call it,
# so we have to use a shell script for indirection, grrr.
rm -rf $DIR/bin || exit 1
mkdir $DIR/bin || exit 1
for prog in ar nm ranlib strip lipo ld ; do
  for t in `echo $TARGETS $HOSTS | sort -u`; do
    P=$DIR/bin/${t}-apple-darwin$DARWIN_VERS-${prog}
    echo '#!/bin/sh' > $P || exit 1
    echo 'exec /usr/bin/'${prog}' "$@"' >> $P || exit 1
    chmod a+x $P || exit 1
  done
done
for t in `echo $1 $2 | sort -u`; do
  gt=`echo $t | $TRANSLATE_ARCH`
  P=$DIR/bin/${gt}-apple-darwin$DARWIN_VERS-as
  echo '#!/bin/sh' > $P || exit 1

  echo 'for a; do case $a in -arch) exec /usr/bin/as "$@";;  esac; done' >> $P || exit 1
  echo 'exec /usr/bin/as -arch '${t}' "$@"' >> $P || exit 1
  chmod a+x $P || exit 1
done
PATH=$DIR/bin:$PATH

# Determine which cross-compilers we should build.  If our build architecture is
# one of our hosts, add all of the targets to the list.
if echo $HOSTS | grep $BUILD
then
  CROSS_TARGETS=`echo $TARGETS $HOSTS | tr ' ' '\n' | sort -u`
else
  CROSS_TARGETS="$HOSTS"
fi

# Build the cross-compilers, using the compiler we just built.
for t in $CROSS_TARGETS ; do
 if [ $t != $BUILD ] ; then
  mkdir -p $DIR/obj-$BUILD-$t $DIR/dst-$BUILD-$t || exit 1
   cd $DIR/obj-$BUILD-$t || exit 1
   if [ \! -f Makefile ]; then
    $SRC_DIR/configure $CONFIGFLAGS --enable-werror-always \
     `if [ $t = 'arm' ] ; then echo $ARM_CONFIGFLAGS ; fi` \
      --program-prefix=$t-apple-darwin$DARWIN_VERS- \
      --host=$BUILD-apple-darwin$DARWIN_VERS --target=$t-apple-darwin$DARWIN_VERS || exit 1
   fi
   make $MAKEFLAGS all CFLAGS="$CFLAGS" CXXFLAGS="$CFLAGS" || exit 1
   make $MAKEFLAGS DESTDIR=$DIR/dst-$BUILD-$t install-gcc install-target \
     CFLAGS="$CFLAGS" CXXFLAGS="$CFLAGS" || exit 1

    # Add the compiler we just built to the path.
   PATH=$DIR/dst-$BUILD-$t/usr/bin:$PATH
 fi
done

########################################
# Construct the actual destination root, by copying stuff from
# $DIR/dst-* to $DEST_DIR, with occasional 'lipo' commands.

cd $DEST_DIR || exit 1

# Clean out DEST_DIR in case -noclean was passed to buildit.
rm -rf * || exit 1

# libgcc
SHARED_LIBS="libgcc_s.1.dylib libgcc_s_v6.1.dylib libgcc_s.10.4.dylib libgcc_s.10.5.dylib"

cd $DEST_DIR || exit 1
mkdir -p .$DEST_ROOT/lib
for l in $SHARED_LIBS ; do
  CANDIDATES=()
  for t in $TARGETS ; do
    if [ -e $DIR/dst-$t-$t$DEST_ROOT/lib/$l ] ; then
      CANDIDATES[${#CANDIDATES[*]}]=$DIR/dst-$t-$t$DEST_ROOT/lib/$l
    # If our target is not one of our hosts, we must look elsewhere for the libraries
    else
      if [ -e $DIR/dst-$BUILD-$t$DEST_ROOT/lib/$l ] ; then
        CANDIDATES[${#CANDIDATES[*]}]=$DIR/dst-$BUILD-$t$DEST_ROOT/lib/$l
      fi
    fi
  done
  if [ ${#CANDIDATES[@]} != '0' ] ; then
    if [ -L ${CANDIDATES[0]} ] ; then
      ln -s `readlink ${CANDIDATES[0]}` .$DEST_ROOT/lib/$l || exit 1
    else
      lipo -output .$DEST_ROOT/lib/$l -create "${CANDIDATES[@]}" || exit 1
    fi
  fi
done

# Done!
exit 0
