#!/bin/sh

DESTDIR="${DESTDIR:-/}"
pkglibdir="${pkglibdir:-/usr/lib/rpm}"

RPMRC="${1:-rpmrc}"
MACROS="${2:-macros}"
PLATFORM="${3:-platform}"

TEMPRC="/tmp/rpmrc.$$"
cat << E_O_F > $TEMPRC
include:	$RPMRC
macrofiles:	$MACROS
E_O_F

RPM="./rpm --rcfile $TEMPRC"

arch="`$RPM --eval '%{_arch}'`"
VENDOR="`$RPM --eval '%{_vendor}'`"
OS="`$RPM --eval '%{_os}'`"
target_platform="`$RPM --eval '%{_target_platform}'`"
target="`$RPM --eval '%{_target}'`"

case "$arch" in
  sparc*) SUBSTS='s_sparc64_sparc_ s_sparc\([^6]\)_sparc64\1_' ;;
  *) SUBSTS=y___ ;;
esac

for SUBST in $SUBSTS; do
  ARCH=`echo $arch | sed -e $SUBST`
  TARGET_PLATFORM=`echo $target_platform | sed -e $SUBST`
  TARGET=`echo $target | sed -e $SUBST`
  LIB=lib

  PPD="${DESTDIR}/${pkglibdir}/${ARCH}-${VENDOR}-${OS}"

  [ -d $PPD ] || mkdir $PPD

  RPMRC_OPTFLAGS="`$RPM --eval '%{optflags}'`"
  RPMRC_OPTFLAGS="`echo $RPMRC_OPTFLAGS | sed -e 's, ,\ ,g'`"

  ARCH_INSTALL_POST='%{nil}'
  case "${ARCH}-${OS}" in
    sparc64-linux) ARCH_INSTALL_POST=${pkglibdir}/brp-sparc64-linux; LIB=lib64 ;;
  esac

  cat $PLATFORM | \
    sed -e s,@RPMRC_OPTFLAGS@,$RPMRC_OPTFLAGS, \
	-e s,@RPMRC_ARCH@,$ARCH, \
	-e s,@LIB@,$LIB, \
	-e s,@ARCH_INSTALL_POST@,$ARCH_INSTALL_POST, \
	-e 's,\${,%{_,' \
  > ${PPD}/macros

  #
  # Better try to create these too until the smoke clears. Yuck.
  [ "${ARCH}-${VENDOR}-${OS}" = "${TARGET}" ] || ln -sf ${ARCH}-${VENDOR}-${OS} ${DESTDIR}/${pkglibdir}/${TARGET}
  [ "${ARCH}-${VENDOR}-${OS}" = "${TARGET_PLATFORM}" ] || ln -sf ${ARCH}-${VENDOR}-${OS} ${DESTDIR}/${pkglibdir}/${TARGET_PLATFORM}

done

rm $TEMPRC