#!/bin/sh -e

#####################################################
# this configure-script searches for the needed includes
# and libraries.
#
# it is MUCH faster, smaller and does what I want. :-)
#
# If you have openssl or the Berkeley db installed in 
# an unusual directory like /home/me/install/ssl
# just give it as argument to ./configure
# it then searches for headers in /home/me/install/ssl/include
# and librarys in /home/me/install/ssl/lib
#
# if you have a very unusual setup or you are cross-compiling
# you can edit "Local.mak" to fit your needs and to reflect your setup
# 
# The Makefiles should support parallel builds.
#
#######################################################

DIRS=""

for dir in $@; do
  DIRS="$DIRS `cd $dir; pwd`"
done

DIRS="$QTDIR $DIRS /usr /usr/X11R6 /usr/local"

CF="-I. -I.."
LIBS=-lstdc++
LDIRS=
MOC=moc
UIC=uic
LRELEASE=lrelease

err() {
  echo
  echo ERROR: $1
  echo 
  err_occ=Y
}

#adds an includedir to $CF
add_include() {
  for _dir in -I/usr/include ${CF}; do
    if test "-I$1" = "${_dir}"; then
      return 0
    fi
  done
 
  CF="${CF} -I$1"
}

add_lib() {
  if test "$3" = "a"; then
    SLIBS="$SLIBS -l$2"
  else
    LIBS="$LIBS -l$2"
  fi  
  for _libs in -L/usr/lib ${LDIRS}; do
    if test "-L$1" = "${_libs}"; then
      return 0
    fi
  done

  LDIRS="${LDIRS} -L$1"
}

# check for includes
search_includes() {
  for dir in ${DIRS};  do
    for dbn in "" ${subdirs}; do
      if test -r ${dir}/include${dbn}/$1; then
          add_include ${dir}/include${dbn}
	  test -z "${dbn}" || add_include ${dir}/include
          echo Found:  $1 at ${dir}/include${dbn}
          return 0
      fi
    done
  done
  return 1
}

# check for libs
search_lib() {
  for dir in ${DIRS};  do
    for dbn in $@; do
      for suffix in so dylib obj a; do
        if test -r ${dir}/lib/lib${dbn}.${suffix}; then
          add_lib ${dir}/lib ${dbn} ${suffix};
	  echo Found: lib${dbn}.${suffix} at ${dir}/lib
          return 0
	fi
      done
    done
  done
  return 1
}
 
echo -e "\n\nConfiguring XCA `cat VERSION`\n----------------------------"

######################## DB
subdirs="/db /db4.1 /db4 /db3"
search_includes db_cxx.h || err "The Berkeley DB header files were not found"
search_lib db_cxx db4_cxx db_cxx-4 db3_cxx db_cxx-3 || err "The Berkeley DB library was not found. Try installing db-dev" 
## The fun of NPTL... (Thx Enrico Scholz)
echo 'int main() {}' >conftest.c
if g++ $LIBS $LDIRS $CF $CFLAGS conftest.c -o conftest &>conftest.log; then
  :
else
  search_lib pthread || err "Lib pthread needed for db_cxx and not found"
fi

######################### QT
subdirs="/qt /Qt /qt4 /qt3 /qt2"
search_includes qobject.h || err "The QT Library headerfiles were not found. Set QTDIR appropriately."
search_lib QtGui qt qt-mt || err "The QT library was not found. Try installing qt-dev" 
search_lib c_r || true
# look if it compiles...
if g++ $LIBS $LDIRS $CF $CFLAGS conftest.c -o conftest &>conftest.log; then
  :
else
  search_lib c_r || err "Libc_r needed for FreeBSD systems and was not found"
fi

###################### OpenSSL
subdirs=""
search_includes openssl/opensslv.h || err "The OpenSSL library headerfiles were not found."
search_lib crypto || err "The OpenSSL library was not found."

export LD_LIBRARY_PATH
##### Try to compile them all together and show the versions.
cat >conftest.c <<EOF
#include <openssl/opensslv.h>
#include <db_cxx.h>
#include <qglobal.h>

main(){
printf("\nThe Versions of the used libraries are:\n\t%s\n\t%s\n\tQT: %s\n",
	 OPENSSL_VERSION_TEXT, DB_VERSION_STRING, QT_VERSION_STR );
}
EOF

if g++ $LIBS $LDIRS $CF $CFLAGS conftest.c -o conftest &>conftest.log ; then
  ./conftest ||err "Unable to execute a freshly compiled application, maybe you have to adjust your LD_LIBRARY_PATH or /etc/ld.so.conf"
  #rm -f conftest.c conftest conftest.log
else
  err "Unable to compile a minimal application look at 'conftest.log' for errors"
fi



if test -x $QTDIR/bin/moc; then
  MOC="$QTDIR/bin/moc"
fi

if test -x $QTDIR/bin/uic; then
  UIC="$QTDIR/bin/uic"
fi

if test -x $QTDIR/bin/lrelease; then
  LRELEASE="$QTDIR/bin/lrelease"
fi

echo
echo "LDFLAGS   :${LIBS}${LDIRS}"
echo "PREFIX    :${prefix:=/usr/local}"
echo "CPPFLAGS  :${CF}"
echo "CFLAGS    :${CFLAGS:=-Wall -g -ggdb}"
echo

cat >Local.mak <<EOF
CPPFLAGS=$CF
CFLAGS=${CFLAGS}

LDFLAGS=$LDIRS

# List of all libs to be compiled statically
SLIBS=$SLIBS

# list of dynamic libraries
LIBS=$LIBS

MOC=$MOC
UIC=$UIC
LRELEASE=$LRELEASE

CC=${CC:=gcc}
LD=${LD:=ld}
STRIP=${STRIP:=strip}

prefix=${prefix}
basedir=${basedir}
EOF

for dirs in /bin /usr/bin /usr/local/bin /sw/bin; do
  for make in gmake make; do
    if ${dirs}/${make} -v 2>/dev/null | grep GNU; then
      mak=${dirs}/${make}
    fi
  done  
done

echo
if test ! -z "${mak}"; then
  echo A usable "make" executable was found in ${mak}
else
  echo No usable "make" executable found.
fi
echo

if test "x${err_occ}" = "xY"; then
  echo
  echo An error occured. Please edit 'Local.mak' manually if compiling fails.
fi