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#! /bin/sh

#

# Check for accurate dependencies in gcc/Makefile.in.

#

# Copyright (C) 2008 Free Software Foundation, Inc.

# Written by Ralf Wildenhues <Ralf.Wildenhues@gmx.de>.

#

# This script is Free Software, and it can be copied, distributed and

# modified as defined in the GNU General Public License.  A copy of

# its license can be downloaded from http://www.gnu.org/copyleft/gpl.html

#

# Start this script in an up to date build-tree/gcc directory.

# Using it in stage1 only works if the host compiler is GCC.

# To continue an interrupted check, make sure there are no *.o.backup

# files lying around (i.e., move them back to their original name),

# and set $start_after to the name of the last object that should be skipped.

start_after=

# Skip some objects unconditionally; make sure each name in this list is

# surrounded by spaces.

skip=" crtbegin.o crtbeginS.o crtbeginT.o crtend.o crtendS.o crtfastmath.o crtprec64.o crtprec80.o crtprec32.o "

# Files which show up as dependencies other than through unconditional #include.

# This is an egrep pattern.

hidden_dep_files='(BASE-VER|DATESTAMP|DEV-PHASE|Makefile|xcoffout\.h|basic-block\.h|bconfig\.h)$'

: ${MAKE=make}

: ${EGREP="grep -E"}

# -------------------------------------------------------------------------

# There should be no need for changes beyond this point.

set -e

st=0

if test -f c-common.o; then :; else

  echo "$0: rerun in an up to date build-tree/gcc directory" >&2

  exit 1

fi

for obj in *.o

do

  if test -n "$start_after"; then

    if test $obj = $start_after; then

      start_after=

    fi

    continue

  fi

  case $skip in *\ $obj\ *) continue ;; esac

  mv -f $obj $obj.backup

  ${MAKE} $obj CFLAGS='-MM -MF depfile'

  mv -f $obj.backup $obj

  ${MAKE} -t

  LC_ALL=C ${MAKE} -d $obj >make-d-log

  hdrs=`cat depfile`

  for hdr in $hdrs; do

    case $hdr in

      *: | *.o | \\ | /* ) ;;

      *)

        echo $hdr ;;

    esac

  done < depfile |

  LC_ALL=C sort -u > hdrs

  sed -n '/.*Prerequisite..\([^ ]*\). is newer than target .'"$obj"'.*/s//\1/p' \

    < make-d-log |

  LC_ALL=C sort -u > not-up-to-date

  if test -s not-up-to-date; then

    st=1

    echo "$0: error: prerequisites for $obj are not up to date:" >&2

    cat not-up-to-date >&2

  fi

  sed -n '/.*Prerequisite..\([^ ]*\). is older than target .'"$obj"'.*/s//\1/p' \

    < make-d-log |

  LC_ALL=C sort -u > deps

  missing_deps=`LC_ALL=C join -v 1 hdrs deps`

  unneeded_deps=`LC_ALL=C join -v 2 hdrs deps | $EGREP -v "$hidden_dep_files" || :`

  if test -n "$missing_deps"; then

    st=1

    echo "missing deps for $obj:"

    echo "$missing_deps" | sed 's/^/  /'

  fi

  if test -n "$unneeded_deps"; then

    # unneeded dependencies are not a big problem, so they cause no failure.

    echo "unneeded deps for $obj:"

    echo "$unneeded_deps" | sed 's/^/  /'

  fi

done

exit $st

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