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  $3
])

  LDFLAGS="$OLD_LDFLAGS"
])

AC_DEFUN(DC_GET_SHOBJFLAGS, [
  AC_SUBST(SHLIBOBJS)
  AC_SUBST(SHOBJFLAGS)
  AC_SUBST(SHOBJLDFLAGS)

  AC_MSG_CHECKING(how to create shared objects)

  if test -z "$SHOBJFLAGS" -a -z "$SHOBJLDFLAGS"; then
    DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-shared -rdynamic], [
      DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-shared], [
        DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-shared -rdynamic -mimpure-text], [
          DC_TEST_SHOBJFLAGS([fPIC -DPIC], [-shared -mimpure-text], [
            DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-shared -rdynamic -Wl,-G,-z,textoff], [
              DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-shared -Wl,-G,-z,textoff], [
                DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-shared -dynamiclib -flat_namespace -undefined suppress -bind_at_load], [
                  DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-dynamiclib -flat_namespace -undefined suppress -bind_at_load], [
                    AC_MSG_RESULT(cant)
                    AC_MSG_ERROR([We are unable to make shared objects.])
                  ])
                ])
              ])
            ])
          ])
        ])
	DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-shared -rdynamic -mimpure-text], [
	  DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-shared -mimpure-text], [
	    DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-shared -rdynamic -Wl,-G,-z,textoff], [
	      DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-shared -Wl,-G,-z,textoff], [
		DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-shared -dynamiclib -flat_namespace -undefined suppress -bind_at_load], [
		  DC_TEST_SHOBJFLAGS([-fPIC -DPIC], [-dynamiclib -flat_namespace -undefined suppress -bind_at_load], [
		    AC_MSG_RESULT(cant)
		    AC_MSG_ERROR([We are unable to make shared objects.])
		  ])
		])
	      ])
	    ])
	  ])
	])
      ])
    ])
  fi

  AC_MSG_RESULT($SHOBJLDFLAGS $SHOBJFLAGS)

  DC_SYNC_SHLIBOBJS
])

AC_DEFUN(DC_SYNC_SHLIBOBJS, [
  AC_SUBST(SHLIBOBJS)
  SHLIBOBJS=""
  for obj in $LIB@&t@OBJS; do
    SHLIBOBJS="$SHLIBOBJS `echo $obj | sed 's/\.o$/_shr.o/g'`"
  done

  AC_MSG_RESULT($SHOBJLDFLAGS $SHOBJFLAGS)
])

AC_DEFUN(DC_CHK_OS_INFO, [
	AC_CANONICAL_HOST
	AC_SUBST(SHOBJEXT)
	AC_SUBST(SHOBJFLAGS)
	AC_SUBST(SHOBJLDFLAGS)
	AC_SUBST(CFLAGS)
	AC_SUBST(CPPFLAGS)
	AC_SUBST(AREXT)

        AC_MSG_CHECKING(host operating system)
        AC_MSG_RESULT($host_os)
	AC_MSG_CHECKING(host operating system)
	AC_MSG_RESULT($host_os)

	SHOBJEXT="so"
	AREXT="a"

        case $host_os in
                darwin*)
	case $host_os in
		darwin*)
			SHOBJEXT="dylib"
                        ;;
			;;
		hpux*)
			SHOBJEXT="sl"
			;;
                mingw32msvc*)
                        SHOBJEXT="dll"
                        SHOBJFLAGS="-mno-cygwin -mms-bitfields -DPIC"
                        SHOBJLDFLAGS='-shared -Wl,--enable-auto-image-base -Wl,--output-def,$[@].def,--out-implib,$[@].a'
                        ;;
		mingw32msvc*|cygwin*)
			SHOBJEXT="dll"
			SHOBJFLAGS="-DPIC"
			CFLAGS="$CFLAGS -mno-cygwin -mms-bitfields"
			CPPFLAGS="$CPPFLAGS -mno-cygwin -mms-bitfields"
			SHOBJLDFLAGS='-shared -Wl,--enable-auto-image-base -Wl,--output-def,$[@].def,--out-implib,$[@].a'
			;;
	esac
])


AC_DEFUN(DC_ASK_OPTLIB, [
  AC_ARG_WITH($5, [  --with-$5 $4], [
# Specified
    LIBSPEC=$withval
  ], [
# Not specified
    LIBSPECFLAGS=`pkg-config --libs $5 2>/dev/null`
    LIBSPECCFLAGS=`pkg-config --cflags $5 2>/dev/null`
    AC_CHECK_LIB($1, $2, [
      OLDCPPFLAGS="$CPPFLAGS"
      OLDCFLAGS="$CFLAGS"
      CPPFLAGS="$CPPFLAGS $LIBSPECCFLAGS"
      CFLAGS="$CFLAGS $LIBSPECCFLAGS"
      AC_CHECK_HEADER($3, [
        LIBSPEC=yes
	LIBSPEC=yes
      ], [
        LIBSPEC=no
	LIBSPEC=no
      ])
      CPPFLAGS="$OLDCPPFLAGS"
      CFLAGS="$OLDCFLAGS"
    ], [
      LIBSPEC=no
      AC_MSG_WARN(Didn't find $5)
    ], $LIBSPECFLAGS)
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