#!/bin/sh

# -------------------------------------------------------------------------
#       $Id$
# 
#       ace-diff-config script - use to compare ACE macro definitions in
#                                ACE configuration headers
# 
# -------------------------------------------------------------------------

#  Copyright (C) 1998  Ossama Othman
#
#  All Rights Reserved
#
# This library is free software; you can redistribute it and/or
# modify it under the current ACE distribution terms.
# 
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

# This is a script that can be used to determine differences between two ACE
# configuration headers.  The file `ACE.ifnames' contains a list of all of the
# identifiers used in ACE's preprocessor conditionals (generated with
# GNU Autoconf's "ifnames" program).  The script will go through the list in
# ACE.ifnames and determine if the given macro was defined in only one of the
# two headers being headers being compared.
#
# The C++ pre-processor is used when comparing so that macros from "#included"
# headers will also be checked.

set -e

INCLUDES="@top_srcdir@"
CXXCPP="@CXXCPP@ -I. -I$INCLUDES"
MACRO_LIST_FILE="ACE.ifnames"
RESULTS_FILE=ace-diff-config.results
TEST_FILE="ace-diff-config.test.cpp"

usage()
{
    cat <<EOF
Usage: ace-diff-config HEADER1 HEADER2
       e.g.:  ./ace-diff-config ace/config-linux-lxpthreads.h ace/config.h

EOF

    exit $1
}

if test $# -eq 0; then
    usage 1
fi

if test -f $RESULTS_FILE; then
  mv $RESULTS_FILE $RESULTS_FILE.bak
fi

if test -f $1; then
  :
else
  echo "error: $1 does not exist"
  exit 1
fi

if test -f $2; then
  :
else
  echo "error: $2 does not exist"
  exit 1
fi

# Process the first header
echo ""
echo -n "Processing $1 "

echo "Macros that are defined in $1" >> $RESULTS_FILE
echo "but not in $2" >> $RESULTS_FILE
echo "-------------------------------------------------------" >> $RESULTS_FILE

list=`cat $MACRO_LIST_FILE`; for p in $list; do
  # Provide some output
  echo -n "."
  cat > $TEST_FILE <<EOF

#include "$1"

#ifdef $p
DEFINED
#endif

EOF

  if (eval "$CXXCPP $TEST_FILE") |
     egrep "DEFINED" >/dev/null; then
    defined=true
  else
    defined=false
  fi

  # now check if it is defined in header #2
  if test $defined = true; then
    cat > $TEST_FILE <<EOF

#include "$2"

#ifdef $p
DEFINED
#endif

EOF

    if (eval "$CXXCPP $TEST_FILE") |
       egrep "DEFINED" >/dev/null; then
      defined=true
    else
      defined=false
    fi

    # if "defined" is false then, the first header is the only header that
    # defines the macro.
    if test $defined = false; then
      echo $p >> $RESULTS_FILE
    fi
  fi

done


# Process the second header
echo ""
echo -n "Processing $2 "

echo "" >> $RESULTS_FILE
echo "Macros that are defined in $2" >> $RESULTS_FILE
echo "but not in $1" >> $RESULTS_FILE
echo "-------------------------------------------------------" >> $RESULTS_FILE

list=`cat $MACRO_LIST_FILE`; for p in $list; do
  # Provide some output
  echo -n "."

  cat > $TEST_FILE <<EOF

#include "$2"

#ifdef $p
DEFINED
#endif

EOF

  if (eval "$CXXCPP $TEST_FILE") |
     egrep "DEFINED" >/dev/null; then
    defined=true
  else
    defined=false
  fi

  # now check if it is defined in header #1
  if test $defined = true; then
    cat > $TEST_FILE <<EOF

#include "$1"

#ifdef $p
DEFINED
#endif

EOF

    if (eval "$CXXCPP $TEST_FILE") |
       egrep "DEFINED" >/dev/null; then
      defined=true
    else
      defined=false
    fi

    # if "defined" is false then, the second header is the only header that
    # defines the macro.
    if test $defined = false; then
      echo $p >> $RESULTS_FILE
    fi
  fi

done

rm $TEST_FILE

echo ""
echo "Results are in $RESULTS_FILE."
echo ""