#!/bin/sh

# set default values
OPT_OPENSSL=auto
OPT_OPENSSL_RUNTIME=auto
OPT_GETTEXT=auto
OPT_CC=

export LC_ALL=C
CFG_LINE="$*"
INSTALL_PREFIX="/usr/local"
test -z "$CC" && CC=cc
CMD_AR=ar
CMD_INSTALL=install
BUILD_DEBUG=
BUILD_STATIC=auto
BUILD_EXTRA_CFLAGS=
BUILD_EXTRA_LDFLAGS=
CHECK_LDFLAGS=
WARN_CFLAGS="-Wall -W -Wstrict-prototypes -Wnested-externs -Winline -Wpointer-arith -Wbad-function-cast -Wmissing-prototypes -Wmissing-declarations"
INSTALL_SYMLINKS="sfv-hash has160-hash gost12-256-hash gost12-512-hash edonr256-hash edonr512-hash tiger-hash tth-hash whirlpool-hash ed2k-link magnet-link"
INSTALL_LIB_STATIC=auto
INSTALL_LIB_SHARED=auto
INSTALL_PKGCONFIGDIR="$PKG_INSTALLDIR"
SHARED_LIB_MODE=${SHARED_LIB_MODE:-755}

# detect and prepare tmp directory
for DETECT_TMP in "$TMPDIR" "$TEMPDIR" "/tmp"; do
  test -d "$DETECT_TMP" && break
done
RANDNUM=$RANDOM
test -z "$RANDNUM" && jot -r 1 2>/dev/null >dev/null && RANDNUM=$(jot -r 1 1 32767) || RANDNUM=0
BUILD_TMPDIR="$DETECT_TMP/rhash-configure-$RANDNUM-$$"
mkdir $BUILD_TMPDIR || die "Unable to create tmp dir."
TMPC="$BUILD_TMPDIR/tmp.c"
TMPT="$BUILD_TMPDIR/tmp.txt"
TMPBIN="$BUILD_TMPDIR/tmp"
TMPLOG="config.log"
rm -f "$TMPLOG"
echo "Configuration parameters: \"$CFG_LINE\"" > "$TMPLOG"
echo "Symlinks to install: $INSTALL_SYMLINKS" >> "$TMPLOG"
echo >> "$TMPLOG"

remove_tmpdir()
{
  rm -rf "$BUILD_TMPDIR"
}
trap remove_tmpdir EXIT

# display error message and exit
die() {
  echo
  echo "Error: $@" >&2
  echo >&2
  test -f "$TMPLOG" && echo "Error: $@" >> "$TMPLOG"
  rm -f "$TMPBIN" "$TMPC" "$TMPT"
  echo "Check \"$TMPLOG\" if you do not understand why it failed."
  exit 1
}

print_help()
{
  cat << EOF
Usage: configure [OPTIONS]...

Generic Options:
  -h, --help             display this help and exit
  --cc=COMPILER          C compiler to build RHash [gcc]
  --ar=AR                librarian to build RHash [ar]
  --target=PLATFORM      target platform (i386-linux, arm-linux, etc)
  --with-install=PATH    path to a custom install program

Directory Options:
  --prefix=DIR           prefix directory for installation [/usr/local]
  --exec-prefix=DIR      prefix directory for binaries [PREFIX]
  --bindir=DIR           directory for installing binaries [EXEC_PREFIX/bin]
  --sysconfdir=DIR       directory to look for configuration file
                         [PREFIX/etc]
  --mandir=DIR           directory for installing man pages [PREFIX/share/man]
  --libdir=DIR           directory for the rhash library [EXEC_PREFIX/lib]
  --pkgconfigdir=DIR     directory for pkg-config files [LIBDIR/pkgconfig]
  --localedir=DIR        directory for locale files [PREFIX/share/locale]

Features options:
  --disable-FEATURE      do not include FEATURE
  --enable-gettext       enable gettext (localization) support [autodetect]
  --enable-openssl[=runtime] enable OpenSSL (optimized hash functions) support.
                         If runtime specified, then load OpenSSL at runtime if
                         the library is found [autodetect]
  --enable-debug         enable debug information
  --enable-static        statically link libraries into RHash binary
  --enable-lib-static    build and install LibRHash static library [auto]
  --enable-lib-shared    build and install LibRHash shared library [auto]
  --enable-symlinks[=LIST]   install symlinks to the binary [enable]

Use these options if autodetection fails:
  --extra-cflags=FLAGS        extra CFLAGS
  --extra-ldflags=FLAGS       extra LDFLAGS
EOF
exit 0
}

check_set_contains()
{
  VALUE="$1"
  shift
  for VALID_VALUE do
	if test "$VALUE" = "$VALID_VALUE"; then
	  return 0
	fi
    shift
  done
  return 1
}

get_opt_value()
{
  echo $(echo $* | cut -d '=' -f 2-)
}

for OPT do
  case "$OPT" in
    --help|-help|-h)
      print_help
      ;;
    --prefix=*)
      INSTALL_PREFIX=$(get_opt_value $OPT)
      ;;
    --exec-prefix=*)
      INSTALL_EXEC_PREFIX=$(get_opt_value $OPT)
      INSTALL_EXEC_PREFIX_SET=yes
      ;;
    --bindir=*)
      INSTALL_BINDIR=$(get_opt_value $OPT)
      ;;
    --mandir=*)
      INSTALL_MANDIR=$(get_opt_value $OPT)
      ;;
    --sysconfdir=*)
      INSTALL_SYSCONFDIR=$(get_opt_value $OPT)
      ;;
    --libdir=*)
      INSTALL_LIBDIR=$(get_opt_value $OPT)
      ;;
    --pkgconfigdir=*)
      INSTALL_PKGCONFIGDIR=$(get_opt_value $OPT)
      ;;
    --localedir=*)
      INSTALL_LOCALEDIR=$(get_opt_value $OPT)
      ;;
  --enable-gettext)
      OPT_GETTEXT=yes
      ;;
  --disable-gettext)
      OPT_GETTEXT=no
      ;;
  --enable-openssl)
      OPT_OPENSSL=yes
      ;;
  --enable-openssl=*)
      OPT_OPENSSL=$(get_opt_value $OPT)
      check_set_contains "$OPT_OPENSSL" "runtime" || die "Unexpected option value: $OPT"
      ;;
  --disable-openssl)
      OPT_OPENSSL=no
      ;;
  --enable-openssl-runtime)
      OPT_OPENSSL=runtime # legacy option
      echo "warning: use --enable-openssl=runtime instead of $OPT" >> "$TMPLOG"
      ;;
  --disable-openssl-runtime)
      OPT_OPENSSL=yes # legacy option
      echo "warning: use --enable-openssl instead of $OPT" >> "$TMPLOG"
      ;;
  --target=*)
    BUILD_TARGET=$(get_opt_value $OPT)
    ;;
  --cc=*)
    CC=$(get_opt_value $OPT)
    OPT_CC=1
    ;;
  --ar=*)
    CMD_AR=$(get_opt_value $OPT)
    ;;
  --enable-static)
    BUILD_STATIC=yes
    ;;
  --disable-static)
    BUILD_STATIC=no
    ;;
  --enable-lib-static)
    INSTALL_LIB_STATIC=yes
    ;;
  --disable-lib-static)
    INSTALL_LIB_STATIC=no
    ;;
  --enable-lib-shared)
    INSTALL_LIB_SHARED=yes
    ;;
  --disable-lib-shared)
    INSTALL_LIB_SHARED=no
    ;;
  --enable-symlinks)
    # use default INSTALL_SYMLINKS list
    ;;
  --enable-symlinks=*)
    INSTALL_SYMLINKS=$(get_opt_value $OPT)
    ;;
  --disable-symlinks)
    INSTALL_SYMLINKS=
    ;;
  --enable-debug)
    BUILD_DEBUG='-g'
    ;;
  --enable-debug=*)
    BUILD_DEBUG='-g '$(get_opt_value $OPT)
    ;;
  --disable-debug)
    BUILD_DEBUG=
    ;;
  --with-install=*)
    CMD_INSTALL=$(get_opt_value $OPT)
    ;;
  --extra-cflags=*)
    BUILD_EXTRA_CFLAGS="$BUILD_EXTRA_CFLAGS $(get_opt_value $OPT)"
    ;;
  --extra-ldflags=*)
    BUILD_EXTRA_LDFLAGS="$BUILD_EXTRA_LDFLAGS $(get_opt_value $OPT)"
    ;;
  *)
      echo "unknown option $OPT"
      exit 1
      ;;
  esac
  shift
done

# set variables which use INSTALL_PREFIX
test -z "$INSTALL_EXEC_PREFIX_SET" && INSTALL_EXEC_PREFIX="$INSTALL_PREFIX"
test -z "$INSTALL_BINDIR" && INSTALL_BINDIR="$INSTALL_EXEC_PREFIX/bin"
test -z "$INSTALL_MANDIR" && INSTALL_MANDIR="$INSTALL_PREFIX/share/man"
test -z "$INSTALL_SYSCONFDIR" && INSTALL_SYSCONFDIR="$INSTALL_PREFIX/etc"
test -z "$INSTALL_INCDIR" && INSTALL_INCDIR="$INSTALL_PREFIX/include"
test -z "$INSTALL_LIBDIR" && INSTALL_LIBDIR="$INSTALL_EXEC_PREFIX/lib"
test -z "$INSTALL_PKGCONFIGDIR" && INSTALL_PKGCONFIGDIR="$INSTALL_LIBDIR/pkgconfig"
test -z "$INSTALL_LOCALEDIR" && INSTALL_LOCALEDIR="$INSTALL_PREFIX/share/locale"

join_params()
{
  printf '%s ' $@ | sed -e 's/ $//'
}

run_cmd() {
  echo "Run: $@" >> "$TMPLOG"
  $@ >> "$TMPLOG" 2>&1
  TMPRES="$?"
  echo "Run result: $TMPRES" >> "$TMPLOG"
  echo >> "$TMPLOG"
  return "$TMPRES"
}

yn_nonempty()
{
  test -n "$1" && echo yes || echo no;
}

log_start()
{
  echo "============ Checking for $1 ============" >> "$TMPLOG"
}

log_finish()
{
  echo "=============================================" >> "$TMPLOG"
  echo "" >> "$TMPLOG"
}

# Use this before starting a check
start_check() {
  log_start "$1"
  printf '%s' "Checking for $1 ... "
  res_comment=""
}

# Use this to echo the results of a check
finish_check() {
  if test -n "$res_comment"; then
    res_comment="($res_comment)"
  fi
  echo "Result is: $1 $res_comment" >> "$TMPLOG"
  log_finish
  echo "$1 $res_comment"
  res_comment=""
}

# check source file compilation and return exit code
compile_check() {
  source="$1"
  shift
  echo >> "$TMPLOG"
  echo "----- source file: $source -----" >> "$TMPLOG"
  cat "$source" >> "$TMPLOG"
  echo "----- end of file: $source -----" >> "$TMPLOG"
  echo "$CC $OPTFLAGS $WARN_CFLAGS $CFLAGS $source $BUILD_EXTRA_CFLAGS $BUILD_EXTRA_LDFLAGS $CHECK_LDFLAGS -o $TMPBIN $@" >> "$TMPLOG"
  rm -f "$TMPBIN"
  $CC $OPTFLAGS $WARN_CFLAGS $CFLAGS "$source" $BUILD_EXTRA_CFLAGS $BUILD_EXTRA_LDFLAGS $CHECK_LDFLAGS -o "$TMPBIN" "$@" >> "$TMPLOG" 2>&1
  TMPRES="$?"
  echo "Compilation result: $TMPRES" >> "$TMPLOG"
  echo >> "$TMPLOG"
  return "$TMPRES"
}

cc_check() {
  compile_check $TMPC $@
}

create_c_file() {
  rm -f "$TMPC"
  if test -n "$1"; then
    echo "#include <$1>" > $TMPC || die "Can't write to the $TMPC file"
  fi
}

cc_check_macro() {
  create_c_file "$1"
  cat >> $TMPC << EOF
#ifndef $2
#error condition not true: $2
#endif
int main(void) { return 0; }
EOF
  shift 2
  cc_check $@
}

cc_check_cflag() {
  echo "int main(void) { return 0; }" > $TMPC
  cc_check $@
}

cc_check_headers() {
  rm -f "$TMPC"
  while test -n "$1"; do
    echo "#include <$1>" >> $TMPC
    shift
  done
  echo "int main(void) { return 0; }" >> $TMPC
  cc_check "-c"
}

cc_check_statement() {
  create_c_file "$1"
  cat >> $TMPC << EOF
int main(void) {
  $2
  return 0;
}
EOF
  shift 2
  cc_check $@
}

# detect host and target OS
start_check "target OS"
HOST_OS=$(uname -s 2>&1)
case "$HOST_OS" in
  Linux|FreeBSD|NetBSD|OpenBSD|DragonFly|BSD/OS|Darwin|SunOS|QNX|GNU|MorphOS|AIX|AmigaOS|Haiku)
    ;;
  IRIX*)
    HOST_OS=IRIX
    ;;
  GNU/kFreeBSD)
    HOST_OS=FreeBSD
    ;;
  HP-UX*)
    HOST_OS=HP-UX
    ;;
  MINGW32*)
    HOST_OS=MINGW32
    ;;
  MINGW64*)
    HOST_OS=MINGW64
    ;;
  MSYS*)
    HOST_OS=MSYS
    ;;
  [cC][yY][gG][wW][iI][nN]*)
    HOST_OS=CYGWIN
    ;;
  OS/2*)
    HOST_OS=OS/2
    ;;
  *)
    HOST_OS="$HOST_OS-UNKNOWN"
    ;;
esac

if test -z "$BUILD_TARGET"; then
  # host's CPU/instruction set
  set_host_arch() {
      case "$1" in
          x86_64|amd64|i[3-9]86*|i86pc|x86|x86pc|k5|k6|k6_2|k6_3|k6-2|k6-3|pentium*|athlon*|i586_i686|i586-i686) HOST_ARCH=i386 ;;
          ia64) HOST_ARCH=ia64 ;;
          macppc|ppc*|Power*) HOST_ARCH=ppc ;;
          alpha) HOST_ARCH=alpha ;;
          sun4*|sparc*) HOST_ARCH=sparc ;;
          parisc*|hppa*|9000*) HOST_ARCH=hppa ;;
          aarch64*) HOST_ARCH=aarch64 ;;
          arm*|zaurus|cats) HOST_ARCH=arm ;;
          sh3|sh4|sh4a) HOST_ARCH=sh ;;
          s390) HOST_ARCH=s390 ;;
          s390x) HOST_ARCH=s390x ;;
          *mips*) HOST_ARCH=mips ;;
          nios2) HOST_ARCH=nios2 ;;
          vax) HOST_ARCH=vax ;;
          xtensa*) HOST_ARCH=xtensa ;;
          *) HOST_ARCH=UNKNOWN ;;
      esac
  }
  set_host_arch "$(uname -m 2>&1)"
  if test "$HOST_ARCH" = UNKNOWN; then
    set_host_arch "$(uname -p 2>&1)"
  fi
  TARGET_OS="$HOST_OS"
  TARGET_ARCH="$HOST_ARCH"
else
  set_target_os() {
    component=$1
    part=$(echo $BUILD_TARGET | cut -d '-' -f $component)
    case "$(echo $part | tr '[A-Z]' '[a-z]')" in
      linux|uclinux) TARGET_OS=Linux ;;
      freebsd*) TARGET_OS=FreeBSD ;;
      gnu/kfreebsd) TARGET_OS=FreeBSD ;;
      netbsd) TARGET_OS=NetBSD ;;
      bsd/os) TARGET_OS=BSD/OS ;;
      openbsd) TARGET_OS=OpenBSD ;;
      dragonfly) TARGET_OS=DragonFly ;;
      sunos|solaris2.*) TARGET_OS=SunOS ;;
      qnx) TARGET_OS=QNX ;;
      morphos) TARGET_OS=MorphOS ;;
      amigaos) TARGET_OS=AmigaOS ;;
      mingw32*) TARGET_OS=MINGW32 ;;
      wine) TARGET_OS=Wine ;;
      darwin*) TARGET_OS=Darwin ;;
      cygwin*) TARGET_OS=CYGWIN ;;
    esac
  }
  TARGET_OS="UNKNOWN"
  set_target_os 3
  if test "$TARGET_OS" = UNKNOWN; then
    set_target_os 2
  fi
  TARGET_ARCH=$(echo $BUILD_TARGET | cut -d '-' -f 1)
  if test "$(echo $TARGET_ARCH)" != "x86_64"; then
    TARGET_ARCH=$(echo $TARGET_ARCH | tr '_' '-')
  fi
fi

echo "Host   OS  : $HOST_OS" >> "$TMPLOG"
echo "Target OS  : $TARGET_OS" >> "$TMPLOG"
echo "Target ARCH: $TARGET_ARCH" >> "$TMPLOG"
finish_check "$TARGET_OS"
test "$TARGET_OS" = UNKNOWN && die "Unknown target OS, please specify the --target option"

OS_LC="$(echo $TARGET_OS | tr '[A-Z]' '[a-z]')"
aix()       { test "$OS_LC" = "aix"; }
amigaos()   { test "$OS_LC" = "amigaos"; }
bsdos()     { test "$OS_LC" = "bsd/os"; }
darwin()    { test "$OS_LC" = "darwin"; }
dragonfly() { test "$OS_LC" = "dragonfly"; }
freebsd()   { test "$OS_LC" = "freebsd" || test "$OS_LC" = "gnu/kfreebsd"; }
gnu()       { test "$OS_LC" = "gnu"; }
hpux()      { test "$OS_LC" = "hp-ux"; }
irix()      { test "$OS_LC" = "irix"; }
linux()     { test "$OS_LC" = "linux"; }
mingw32()   { test "$OS_LC" = "mingw32"; }
mingw64()   { test "$OS_LC" = "mingw64"; }
msys()      { test "$OS_LC" = "msys"; }
cygwin()    { test "$OS_LC" = "cygwin"; }
netbsd()    { test "$OS_LC" = "netbsd"; }
openbsd()   { test "$OS_LC" = "openbsd"; }
os2()       { test "$OS_LC" = "os/2"; }
qnx()       { test "$OS_LC" = "qnx"; }
sunos()     { test "$OS_LC" = "sunos"; }
wine()      { test "$OS_LC" = "wine"; }
win32()     { cygwin || mingw32 || mingw64 || msys || wine; }
posix_make() { aix || bsdos || hpux || irix || qnx || sunos; }

# Checking CC version...
# Intel C++ Compilers (no autoselect, use CC=/some/binary ./configure)
cc_vendor=
if test "$(basename $CC)" = "icc" || test "$(basename $CC)" = "ecc"; then
  start_check "$CC version"
  cc_vendor=intel
  cc_name=$($CC -V 2>&1 | head -n 1 | cut -d ',' -f 1)
  cc_version=$($CC -V 2>&1 | head -n 1 | cut -d ',' -f 2 | cut -d ' ' -f 3)
  _cc_major=$(echo $cc_version | cut -d '.' -f 1)
  _cc_minor=$(echo $cc_version | cut -d '.' -f 2)
  case $cc_version in
    '')
      cc_version="v. ?.??, bad"
      cc_fail=yes
      ;;
    10.1|11.1|12.*|13.*|20*)
      cc_version="$cc_version, ok"
      ;;
    *)
      cc_version="$cc_version, bad"
      cc_fail=yes
      ;;
  esac
  finish_check "$cc_version"
else
  CC_TMP="$CC"
  test -n "$OPT_CC" && OTHER_CC= || OTHER_CC="gcc cc"
  for CC in "$CC_TMP" $OTHER_CC; do
    cc_name_tmp=
    if run_cmd "$CC -v"; then
      cc_name_tmp=$($CC -v 2>&1 | tail -n 1 | cut -d ' ' -f 1)
    elif run_cmd "$CC --version"; then
      cc_name_tmp=$($CC --version 2>&1 | head -n 1 | cut -d ' ' -f 1)
    fi
    if echo "$cc_name_tmp" | grep -q "gcc"; then
      cc_name=$cc_name_tmp
      start_check "$CC version"
      cc_vendor=gnu
      cc_version=$($CC -dumpversion 2>&1)
      if ! echo $cc_version | grep -q '^[0-9][0-9]*\.[0-9]'; then
        cc_v2=$($CC -dumpfullversion -dumpversion 2>/dev/null)
        if echo $cc_v2 | grep -q '^[0-9][0-9]*\.[0-9]'; then
          cc_version=$cc_v2
        fi
      fi
      case $cc_version in
        2.96*)
          cc_fail=yes
          ;;
        *)
          _cc_major=$(echo $cc_version | cut -d '.' -f 1)
          _cc_minor=$(echo $cc_version | cut -d '.' -f 2)
          _cc_mini=$(echo $cc_version | cut -d '.' -f 3)
          ;;
      esac
      finish_check "$cc_name $cc_version"
      break
    elif $CC --version 2>&1 | grep -q "clang"; then
      start_check "$CC version"
      cc_vendor=clang
      cc_version=$($CC -dumpversion 2>&1)
      finish_check "clang $cc_version"
      break
    else
      cc_name_tmp=$($CC -V 2>&1 | head -n 1 | cut -d ' ' -f 2,3)
      if test "$cc_name_tmp" = "Sun C"; then
        start_check "$CC version"
        cc_vendor=sun
        cc_version=$($CC -V 2>&1 | head -n 1 | cut -d ' ' -f 4)
        res_comment="experimental support"
        finish_check "Sun C $cc_version"
        break
      fi
    fi
  done
fi # icc
test -z "$cc_vendor" && die "compiler not found"
test "$cc_fail" = "yes" && die "unsupported compiler version"

log_start "compiler working with default options"
if ! cc_check_cflag; then
  die "compiler doesn't work"
fi
log_finish

if test "$cc_name" = "gcc" && test "$_cc_major" -gt 3; then
  WARN_CFLAGS="$WARN_CFLAGS -Wdeclaration-after-statement"
fi

# select optimization flags
has_optimization()
{
  # posix-compatible way to find -O<n> option
  for OPT in $BUILD_EXTRA_CFLAGS $BUILD_DEBUG; do
    case "$OPT" in
      -O[0-3]|-O) return 0 ;;
    esac
  done
  return 1
}
has_optimization && OPTLEVEL= || OPTLEVEL="-O2"
test -n "$BUILD_DEBUG" && OPTNDEBUG= || OPTNDEBUG="-DNDEBUG"
OPTFLAGS="-pipe -ffunction-sections -fdata-sections"
check_set_contains "-fno-omit-frame-pointer" $BUILD_EXTRA_CFLAGS $BUILD_DEBUG \
  || OPTFLAGS="$OPTFLAGS -fomit-frame-pointer"
OPTFLAGS=$(join_params $BUILD_DEBUG $OPTLEVEL $OPTNDEBUG $OPTFLAGS)

# test that compiler works with options specified by command line
log_start "compiler working with provided options"
if ! cc_check_cflag; then
  die "wrong compiler options provided"
fi
log_finish

# detect proper shared library name
SHARED_PREFIX="lib"
STATIC_PREFIX="lib"
SHARED_EXT=".so.0"
STATIC_EXT=".a"
SOLINK_EXT=".so"
EXEC_EXT=
NEED_IMPLIB=no
NEED_SOLINK=yes
INSTALL_SO_DIR=$INSTALL_LIBDIR
LN_S="ln -sf"
if win32; then
  LN_S="cp -pR"
  EXEC_EXT=".exe"
  SHARED_EXT=".dll"
  NEED_IMPLIB=yes
  NEED_SOLINK=no
  INSTALL_SO_DIR=$INSTALL_BINDIR
  if msys; then
    SHARED_PREFIX="msys-"
  elif cygwin; then
    SHARED_PREFIX="cyg"
  fi
elif darwin; then
  SHARED_EXT=".0.dylib"
  SOLINK_EXT=".dylib"
fi

# check for linker flags
LD_STATIC=-static
test "$BUILD_STATIC" = "auto" && BUILD_STATIC=no
test "$OPT_OPENSSL" = "runtime" && ! win32 && LD_STATIC=
if test -n "$LD_STATIC"; then
  start_check "linker support for $LD_STATIC"
  if cc_check_cflag "$LD_STATIC"; then
    test "$BUILD_STATIC" = "yes" && CHECK_LDFLAGS=$LD_STATIC
  else
    LD_STATIC=
  fi
  finish_check $(yn_nonempty "$LD_STATIC")
fi

LIBDL_LDFLAGS=
if win32; then
  ALLOW_RUNTIME_LINKING=yes
elif test "$BUILD_STATIC" = "yes"; then
  ALLOW_RUNTIME_LINKING=no
elif test "$OPT_OPENSSL" = "auto" || test "$OPT_OPENSSL" = "runtime"; then
  start_check "linker support for dlopen"
  ALLOW_RUNTIME_LINKING=no
  if cc_check_statement "dlfcn.h" 'dlopen("", RTLD_NOW);'; then
    ALLOW_RUNTIME_LINKING=yes
  elif cc_check_statement "dlfcn.h" 'dlopen("", RTLD_NOW);' "-ldl"; then
    ALLOW_RUNTIME_LINKING=yes
    LIBDL_LDFLAGS="-ldl"
  fi
  finish_check "$ALLOW_RUNTIME_LINKING"
fi

SHARED_VSCRIPT=
if ! darwin; then
  start_check "linker support for --version-script"
  echo "{ local: *; };" > $TMPT
  cc_check_cflag "-Wl,--version-script,$TMPT -shared" &&
    SHARED_VSCRIPT=",--version-script,exports.sym"
  finish_check $(yn_nonempty "$SHARED_VSCRIPT")
fi

WIN_LDFLAGS=
if win32; then
  start_check "linker support for --nxcompat --no-seh --dynamicbase"
  cc_check_cflag "-Wl,--nxcompat,--no-seh,--dynamicbase" &&
    WIN_LDFLAGS="-Wl,--nxcompat,--no-seh,--dynamicbase"
  finish_check $(yn_nonempty "$WIN_LDFLAGS")
fi

# detect library names and build flags
LIBRHASH_SHARED="${SHARED_PREFIX}rhash${SHARED_EXT}"
LIBRHASH_STATIC="${STATIC_PREFIX}rhash${STATIC_EXT}"
LIBRHASH_SOLINK="${SHARED_PREFIX}rhash${SOLINK_EXT}"
LIBRHASH_SOLINK_TARGET=
test "$NEED_SOLINK" = "yes" && LIBRHASH_SOLINK_TARGET=$LIBRHASH_SOLINK
LIBRHASH_DEF="${SHARED_PREFIX}rhash.def"
LIBRHASH_IMPLIB="${STATIC_PREFIX}rhash${SHARED_EXT}${STATIC_EXT}"
LIBRHASH_EXPORTS_FILE="exports.sym"
LIBRHASH_EXPORTS_TARGET=
LIBRHASH_SH_CFLAGS=""
LIBRHASH_SH_LDFLAGS=""
LIBRHASH_RM_FILES=
LIBRHASH_LEGACY_HEADERS=
if win32; then
  LIBRHASH_SH_CFLAGS="-DRHASH_EXPORTS"
  LIBRHASH_SH_LDFLAGS="-shared -Wl,--out-implib=${LIBRHASH_IMPLIB}${SHARED_VSCRIPT},--output-def,${LIBRHASH_DEF}"
  test -n "$SHARED_VSCRIPT" && LIBRHASH_EXPORTS_TARGET=$LIBRHASH_EXPORTS_FILE
  LIBRHASH_RM_FILES="${LIBRHASH_IMPLIB} ${LIBRHASH_DEF}"
elif darwin; then
  LIBRHASH_SH_CFLAGS="-fpic"
  LIBRHASH_SH_LDFLAGS='-dynamiclib -Wl,-install_name,$(LIBDIR)/$@'
else
  LIBRHASH_LEGACY_HEADERS="rhash_timing.h"
  LIBRHASH_SH_CFLAGS="-fpic"
  LIBRHASH_SH_LDFLAGS="-shared -Wl${SHARED_VSCRIPT},-soname,\$(LIBRHASH_SHARED)"
  test -n "$SHARED_VSCRIPT" && LIBRHASH_EXPORTS_TARGET=$LIBRHASH_EXPORTS_FILE
fi
LIBRHASH_RM_FILES=$(join_params $LIBRHASH_RM_FILES $LIBRHASH_EXPORTS_TARGET $LIBRHASH_SOLINK_TARGET)

RHASH_DEFINES=
LIBRHASH_DEFINES=
GETTEXT_LDFLAGS=
OPENSSL_LDFLAGS=
if test "$OPT_GETTEXT" != "no"; then
  start_check "gettext"
  GETTEXT_FOUND=no
  if cc_check_headers "libintl.h"; then
    if cc_check_statement "libintl.h" "gettext(\"\");"; then
      GETTEXT_FOUND=found
    elif cc_check_statement "libintl.h" "gettext(\"\");" "-lintl"; then
      GETTEXT_LDFLAGS="-lintl"
      GETTEXT_FOUND=found
    elif cc_check_statement "libintl.h" "gettext(\"\");" "-lintl -liconv"; then
      GETTEXT_LDFLAGS="-lintl -liconv"
      GETTEXT_FOUND=found
    fi
  fi
  test "$GETTEXT_FOUND" = "found" && RHASH_DEFINES=$(join_params $RHASH_DEFINES -DUSE_GETTEXT)
  finish_check $GETTEXT_FOUND
  test "$OPT_GETTEXT" = "yes" && test "$GETTEXT_FOUND" = "no" && die "gettext library not found"
fi

if test "$OPT_OPENSSL" != "no"; then
  start_check "OpenSSL"
  OPENSSL_FOUND=no
  if test "$ALLOW_RUNTIME_LINKING" = "no"; then
    echo "No runtime library loading, because dlopen() is not found!" >> "$TMPLOG"
    test "$OPT_OPENSSL" = "runtime" && die "dlopen() is required for OpenSSL runtime loading"
  fi
  OPENSSL_HEADERS="openssl/opensslconf.h openssl/md4.h openssl/md5.h openssl/sha.h"
  if cc_check_headers $OPENSSL_HEADERS; then
    if test "$OPT_OPENSSL" = "runtime" || ( test "$ALLOW_RUNTIME_LINKING" = "yes" && test "$OPT_OPENSSL" = "auto" ); then
      OPENSSL_FOUND=runtime
      LIBRHASH_DEFINES=$(join_params $LIBRHASH_DEFINES -DOPENSSL_RUNTIME)
      OPENSSL_LDFLAGS="$LIBDL_LDFLAGS"
      # note: libdl should disable -static
      test -n "$LIBDL_LDFLAGS" && LD_STATIC=
    elif win32 && cc_check_statement "openssl/md5.h" "MD5_Init(NULL);" "-leay32"; then
      OPENSSL_FOUND=found
      LIBRHASH_DEFINES=$(join_params $LIBRHASH_DEFINES -DUSE_OPENSSL)
      OPENSSL_LDFLAGS="-leay32"
    elif cc_check_statement "openssl/md5.h" "MD5_Init(NULL);" "-lcrypto"; then
      OPENSSL_FOUND=found
      LIBRHASH_DEFINES=$(join_params $LIBRHASH_DEFINES -DUSE_OPENSSL)
      OPENSSL_LDFLAGS="-lcrypto"
    fi
  fi
  finish_check $OPENSSL_FOUND
  test "$OPT_OPENSSL" != "auto" && test "$OPENSSL_FOUND" = "no" && die "OpenSSL library not found"
fi

# building of static/shared binary and library
RHASH_STATIC=rhash_static
RHASH_SHARED=rhash_shared
RHASH_BUILD_TARGETS=
RHASH_EXTRA_INSTALL=
LIBRHASH_BUILD_TARGETS=
LIBRHASH_TEST_TARGETS=
EXTRA_INSTALL_LIBSHARED=
EXTRA_UNINSTALL_LIBSHARED=
if test "$BUILD_STATIC" = "yes"; then
  RHASH_STATIC=rhash
  RHASH_BUILD_TYPE=static
  RHASH_BUILD_TARGETS="\$(RHASH_STATIC)"
  test "$INSTALL_LIB_SHARED" = "yes" && RHASH_BUILD_TARGETS="$RHASH_BUILD_TARGETS \$(LIBRHASH_SHARED)"
else
  RHASH_SHARED=rhash
  RHASH_BUILD_TYPE=shared
  RHASH_BUILD_TARGETS="\$(RHASH_SHARED)"
  test "$INSTALL_LIB_SHARED" = "auto" && INSTALL_LIB_SHARED=yes
  test "$INSTALL_LIB_STATIC" = "yes"  && RHASH_BUILD_TARGETS="$RHASH_BUILD_TARGETS \$(LIBRHASH_STATIC)"
fi
if test "$INSTALL_LIB_STATIC" = "yes"; then
  RHASH_EXTRA_INSTALL=$(join_params $RHASH_EXTRA_INSTALL install-lib-static)
  LIBRHASH_BUILD_TARGETS=$LIBRHASH_STATIC
  LIBRHASH_TEST_TARGETS=test-static
fi
if test "$NEED_IMPLIB" = "yes"; then
  EXTRA_INSTALL_LIBSHARED="install-implib"
  EXTRA_UNINSTALL_LIBSHARED="uninstall-implib"
fi
if test "$INSTALL_LIB_SHARED" = "yes"; then
  RHASH_EXTRA_INSTALL=$(join_params $RHASH_EXTRA_INSTALL install-lib-shared)
  LIBRHASH_BUILD_TARGETS=$(join_params $LIBRHASH_BUILD_TARGETS $LIBRHASH_SHARED)
  LIBRHASH_TEST_TARGETS=$(join_params $LIBRHASH_TEST_TARGETS test-shared)
fi

# check for old POSIX make
posix_make && Q_ASSIGN="=" || Q_ASSIGN="?="

# detect source directories
start_check "sources"
HAS_RHASH=no
HAS_LIBRHASH=no
HAS_BINDINGS=no
RHASH_VERSION=
RHASH_XVERSION=
BINDINGS_VERSION=
RHASH_SRC=
LIBRHASH_SRC=
LIBRHASH_PC=
BINDINGS_SRC=
SRC_FOUND=no
test -f Makefile || die "Makefile not found"
if test -f rhash_main.c; then
  HAS_RHASH=yes
  SRC_FOUND=RHash
  if test -d librhash; then
    HAS_LIBRHASH=yes
    LIBRHASH_SRC=librhash/
  fi
  if test -f bindings/version.properties; then
    HAS_BINDINGS=yes
    BINDINGS_SRC=bindings/
  fi
elif test -f rhash.c; then
  HAS_LIBRHASH=yes
  SRC_FOUND=LibRHash
elif test -f version.properties; then
  HAS_BINDINGS=yes
  SRC_FOUND="RHash bindings"
fi
echo "RHASH_SRC=$RHASH_SRC, LIBRHASH_SRC=$LIBRHASH_SRC, BINDINGS_SRC=$BINDINGS_SRC" >> "$TMPLOG"

# check version
good_version() { echo "$1" | grep -q '^[1-9]\.[1-9][0-9]*\.[0-9]' ; }
if test "$HAS_RHASH" = "yes" || test "$HAS_LIBRHASH" = "yes"; then
  test -f "${RHASH_SRC}version.h" || die "${RHASH_SRC}version.h not found"
  RHASH_VERSION=$(cut -d'"' -f2 "${RHASH_SRC}version.h")
  echo "RHASH_VERSION=$RHASH_VERSION" >> "$TMPLOG"
  good_version "$RHASH_VERSION" || die "wrong version: $RHASH_VERSION"
  _v1=$(echo $RHASH_VERSION | cut -d '.' -f 1)
  _v2=$(echo $RHASH_VERSION | cut -d '.' -f 2)
  _v3=$(echo $RHASH_VERSION | cut -d '.' -f 3)
  RHASH_XVERSION=$(printf "0x%02x%02x%02x%02x" "$_v1" "$_v2" "$_v3" 0)
  test "$HAS_LIBRHASH" = "yes" && LIBRHASH_PC=dist/librhash.pc
fi
if test "$HAS_BINDINGS" = "yes"; then
  BINDINGS_VERSION=$(cut -d = -f 2 "${BINDINGS_SRC}version.properties")
  echo "BINDINGS_VERSION=$BINDINGS_VERSION" >> "$TMPLOG"
  good_version "$BINDINGS_VERSION" || die "wrong bindings version: $BINDINGS_VERSION"
  test -z "$RHASH_VERSION" && RHASH_VERSION="$BINDINGS_VERSION"
fi
test -n "$RHASH_VERSION" && SRC_FOUND="$SRC_FOUND $RHASH_VERSION"
finish_check "$SRC_FOUND"
test "$SRC_FOUND" = "no" && die "sources not found"

if test "$HAS_BINDINGS" = "yes" && test "$BINDINGS_VERSION" != "$RHASH_VERSION"; then
  echo "Updating ${BINDINGS_SRC}version.properties"
  echo "version=$RHASH_VERSION" > ${BINDINGS_SRC}version.properties
fi

if test "$HAS_RHASH" = "yes"; then
  echo "Writing ${RHASH_SRC}config.mak"
  cat > ${RHASH_SRC}config.mak << EOF
# -------- Generated by configure -----------

DESTDIR $Q_ASSIGN
BINDIR       = \$(DESTDIR)$INSTALL_BINDIR
SYSCONFDIR   = \$(DESTDIR)$INSTALL_SYSCONFDIR
MANDIR       = \$(DESTDIR)$INSTALL_MANDIR
PKGCONFIGDIR = \$(DESTDIR)$INSTALL_PKGCONFIGDIR
LOCALEDIR    = \$(DESTDIR)$INSTALL_LOCALEDIR

AR      = $CMD_AR
CC      = $CC
INSTALL = $CMD_INSTALL

LIBRHASH_STATIC = librhash/$LIBRHASH_STATIC
LIBRHASH_SHARED = librhash/$LIBRHASH_SHARED
BUILD_TYPE      = $RHASH_BUILD_TYPE
VERSION         = $RHASH_VERSION
EXEC_EXT        = $EXEC_EXT
RHASH_STATIC    = $RHASH_STATIC\$(EXEC_EXT)
RHASH_SHARED    = $RHASH_SHARED\$(EXEC_EXT)
BUILD_TARGETS   = $RHASH_BUILD_TARGETS
EXTRA_INSTALL   = $RHASH_EXTRA_INSTALL
SYMLINKS        = $INSTALL_SYMLINKS
LN_S            = $LN_S

OPTFLAGS    = $OPTFLAGS
OPTLDFLAGS  = $WIN_LDFLAGS
WARN_CFLAGS = $WARN_CFLAGS
ADDCFLAGS   = $BUILD_EXTRA_CFLAGS
ADDLDFLAGS  = $BUILD_EXTRA_LDFLAGS
CONFCFLAGS  = -DSYSCONFDIR=\\"$INSTALL_SYSCONFDIR\\"
LOCALECFLAGS = -DLOCALEDIR=\\"$INSTALL_LOCALEDIR\\"
CFLAGS  = $RHASH_DEFINES \$(OPTFLAGS) \$(WARN_CFLAGS) \$(ADDCFLAGS)
LDFLAGS = \$(OPTLDFLAGS) \$(ADDLDFLAGS) $GETTEXT_LDFLAGS
BIN_STATIC_LDFLAGS = \$(LDFLAGS) $(join_params $LD_STATIC $OPENSSL_LDFLAGS)

EOF
fi


if test "$HAS_LIBRHASH" = "yes"; then
  echo "Writing ${LIBRHASH_SRC}config.mak"
  cat > ${LIBRHASH_SRC}config.mak << EOF
# -------- Generated by configure -----------

DESTDIR $Q_ASSIGN
INCDIR  = \$(DESTDIR)$INSTALL_INCDIR
LIBDIR  = \$(DESTDIR)$INSTALL_LIBDIR
SO_DIR  = \$(DESTDIR)$INSTALL_SO_DIR

AR      = $CMD_AR
CC      = $CC
INSTALL = $CMD_INSTALL

LIBRHASH_STATIC  = $LIBRHASH_STATIC
LIBRHASH_SHARED  = $LIBRHASH_SHARED
LIBRHASH_SOLINK  = $LIBRHASH_SOLINK
LIBRHASH_DEF     = $LIBRHASH_DEF
LIBRHASH_IMPLIB  = $LIBRHASH_IMPLIB
EXPORTS_FILE     = $LIBRHASH_EXPORTS_FILE
RM_FILES         = $LIBRHASH_RM_FILES
BUILD_TYPE       = $RHASH_BUILD_TYPE
EXEC_EXT         = $EXEC_EXT
LEGACY_HEADERS   = $LIBRHASH_LEGACY_HEADERS

EXPORTS_TARGET   = $LIBRHASH_EXPORTS_TARGET
BUILD_TARGETS    = $LIBRHASH_BUILD_TARGETS
TEST_TARGETS     = $LIBRHASH_TEST_TARGETS
SOLINK_TARGET    = $LIBRHASH_SOLINK_TARGET
SHARED_LIB_MODE  = $SHARED_LIB_MODE
EXTRA_INSTALL_LIBSHARED   = $EXTRA_INSTALL_LIBSHARED
EXTRA_UNINSTALL_LIBSHARED = $EXTRA_UNINSTALL_LIBSHARED

OPTFLAGS    = $OPTFLAGS
OPTLDFLAGS  = $WIN_LDFLAGS
WARN_CFLAGS = $WARN_CFLAGS
ADDCFLAGS   = $BUILD_EXTRA_CFLAGS
ADDLDFLAGS  = $BUILD_EXTRA_LDFLAGS
CFLAGS  = $LIBRHASH_DEFINES \$(OPTFLAGS) \$(WARN_CFLAGS) \$(ADDCFLAGS)
LDFLAGS = \$(OPTLDFLAGS) \$(ADDLDFLAGS)
SHARED_CFLAGS  = \$(CFLAGS) $LIBRHASH_SH_CFLAGS
SHARED_LDFLAGS = \$(LDFLAGS) $(join_params $OPENSSL_LDFLAGS $LIBRHASH_SH_LDFLAGS)
VERSION_CFLAGS = -DRHASH_XVERSION=$RHASH_XVERSION
BIN_STATIC_LDFLAGS = \$(LDFLAGS) $(join_params $LD_STATIC $OPENSSL_LDFLAGS)

EOF
fi

if test -n "$LIBRHASH_PC"; then
  PC_EXC="$INSTALL_EXEC_PREFIX"
  PC_INC="$INSTALL_INCDIR"
  PC_LIB="$INSTALL_LIBDIR"
  test "$PC_EXC" = "${INSTALL_PREFIX}" && PC_EXC='${prefix}'
  test "$PC_INC" = "${INSTALL_PREFIX}/include" && PC_INC='${prefix}/include'
  test "$PC_LIB" = "${INSTALL_EXEC_PREFIX}/lib" && PC_LIB='${exec_prefix}/lib'
  echo "Writing ${LIBRHASH_PC}"
  cat > $LIBRHASH_PC << EOF
prefix=${INSTALL_PREFIX}
exec_prefix=${PC_EXC}
libdir=${PC_LIB}
includedir=${PC_INC}

Name: librash
Description: LibRHash shared library
Version: ${RHASH_VERSION}
Cflags: -I\${includedir}
Libs: -L\${libdir} -lrhash
Libs.private: ${OPENSSL_LDFLAGS}

EOF
fi