#!/bin/sh

# args: srcdir srctop-from-srcdir header-path

d=`pwd`

head -1 $1/configure.ac > config-in.tmp

echo "AC_CONFIG_HEADER(fooconfig.h:$d/fooconfig-h.tmp)" >> config-in.tmp

tail +2 $1/configure.ac | grep -v AC_CONFIG_HEADER >> config-in.tmp

mv -f config-in.tmp config-in.ac~

if (cd $1 && autoheader --include=$2 $d/config-in.ac~) > /dev/null; then

  rm -rf $1/autom4te.cache config-in.ac~

else

  rm -rf $1/autom4te.cache

# config-in.ac~ fooconfig-h.tmp

  echo autoheader failed, eek

  exit 1

fi

awk '/^#undef/ { print $2; }' < fooconfig-h.tmp | sort > acsyms.here

rm -f fooconfig-h.tmp

awk '/^#undef/ { print $2; }' < $3 | sort > acsyms.there

comm -23 acsyms.here acsyms.there > acsyms.extra

rm -f acsyms.here acsyms.there

if test -s acsyms.extra; then

  echo ERROR: Symbol or symbols defined here but not in `basename $3`: `cat acsyms.extra`

  rm -f acsyms.extra

  exit 1

fi

rm -f acsyms.extra

exit 0