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#!/usr/bin/env bash

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

RPMRC="${1:-rpmrc}"
PLATFORM="${2:-platform}"
VENDOR="${3}"
OS="${4}"
RPMRC_GNU="${5}"

for ARCH in noarch `grep ^arch_canon $RPMRC | cut -d: -f2`; do
  RPMRC_OPTFLAGS="`sed -n 's/^optflags: '$ARCH' //p' $RPMRC`"
  RPMRC_OPTFLAGS="`echo $RPMRC_OPTFLAGS | sed -e 's, ,\ ,g'`"
  case $RPMRC_OPTFLAGS in
  *-g*) ;;
  *) RPMRC_OPTFLAGS="$RPMRC_OPTFLAGS -g" ;;
  esac

  ARCH_INSTALL_POST='%{nil}'
  LIB=lib

  # XXX FIXME: incomplete and quite likely wrong too in places,
  # consult various arch folks for correct names etc.
  ISANAME=
  ISABITS=
  CANONARCH=
  CANONCOLOR=
  FILTER=cat
  case "${ARCH}" in
    sparc64*) 
	ISANAME=sparc
	ISABITS=64
	CANONARCH=sparc64
	CANONCOLOR=3
	;;
    sparc*) 
	ISANAME=sparc
	ISABITS=32
	CANONARCH=sparc
	CANONCOLOR=0
	;;
    s390)
	ISANAME=s390
	ISABITS=32
	CANONARCH=s390
	CANONCOLOR=0
	;;
    s390x)
	ISANAME=s390
	ISABITS=64
	CANONARCH=s390x
	CANONCOLOR=3
	;;
    ppc64*)
	ISANAME=ppc
	ISABITS=64
	CANONARCH=ppc64
	CANONCOLOR=3
	;;
    ppc*)
	ISANAME=ppc
	ISABITS=32
	CANONARCH=ppc
	CANONCOLOR=0
	;;
    i?86|pentium?|athlon|geode)
	ISANAME=x86
	ISABITS=32
	CANONARCH=i386
	CANONCOLOR=0
	;;
    x86_64|amd64|ia32e)
	ISANAME=x86
	ISABITS=64
	CANONARCH=x86_64
	CANONCOLOR=3
	;;
    ia64)
	ISANAME=ia
	ISABITS=64
	CANONARCH=ia64
	CANONCOLOR=2
	;;
    sh*)
	ISANAME=sh
	ISABITS=32
	CANONARCH=${ARCH}
	CANONCOLOR=0
	;;
    arm*)
	ISANAME=`echo ${ARCH} | sed "s/^\([^-]*\)-.*/\1/"`
	ISABITS=32
	CANONARCH=arm
	CANONCOLOR=0
	;;
    alpha*)
	ISANAME=alpha
	ISABITS=64
	CANONARCH=alpha
	CANONCOLOR=0
	;;
    aarch64)
	ISANAME=aarch
	ISABITS=64
	CANONARCH=aarch64
	CANONCOLOR=3
	;;
    noarch)
	CANONARCH=noarch
	CANONCOLOR=0
	FILTER="grep -v -E ^(%optflag|%__isa)"
	;;
  esac

  # skip architectures for which we dont have full config parameters
  [ -z "$CANONARCH" ] && continue

  for macro in $(rpm --showrc | grep _host_cpu | cut -f2 );do
    case "$macro" in
      sparc64*) 
      CANONCOLOR=3
      ;;
      sparc*) 
      CANONCOLOR=0
      ;;
      s390)
      CANONCOLOR=0
      ;;
      s390x)
      CANONCOLOR=3
      ;;
      ppc64*)
      CANONCOLOR=3
      ;;
      ppc*)
      CANONCOLOR=0
      ;;
      i?86|pentium?|athlon|geode)
      CANONCOLOR=0
      ;;
      x86_64|amd64|ia32e)
      CANONCOLOR=3
      ;;
      ia64)
      CANONCOLOR=2
      ;;
      sh*)
      CANONCOLOR=0
      ;;
      arm*)
      CANONCOLOR=0
      ;;
      alpha*)
      CANONCOLOR=0
      ;;
      aarch64)
      CANONCOLOR=3
      ;;
      noarch)
      CANONCOLOR=0
      ;;
    esac
  done

  if [ "$OS" = "linux" ] && [ "$CANONCOLOR" = 3 ]; then
      LIB=${LIB}64
  fi

  PPD="${DESTDIR}/${platformdir}/${ARCH}-${OS}"
  [ -d $PPD ] || mkdir -p $PPD

  cat $PLATFORM \
  | sed -e "s#@RPMRC_OPTFLAGS@#$RPMRC_OPTFLAGS#" \
	-e "s,@RPMCANONARCH@,$CANONARCH,g" \
	-e "s,@RPMCANONCOLOR@,$CANONCOLOR," \
	-e "s,@RPMRC_GNU@,$RPMRC_GNU," \
	-e "s,@LIB@,$LIB," \
	-e "s,@ARCH_INSTALL_POST@,$ARCH_INSTALL_POST," \
	-e '/\${\w*:-/!s,\${,%{_,' \
	-e "s,@ISANAME@,$ISANAME," \
	-e "s,@ISABITS@,$ISABITS," \
	-e "s,^@${VENDOR}@,," \
  | grep -v '^@' \
  | ${FILTER} \
  > ${PPD}/macros

done