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# ====================================================================

#

#      compat.cdl

#

#      Maths library compatibility related configuration data

#

# ====================================================================

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# ====================================================================

######DESCRIPTIONBEGIN####

#

# Author(s):      jskov

# Original data:  jlarmour

# Contributors:

# Date:           1999-07-07

#

#####DESCRIPTIONEND####

#

# ====================================================================

cdl_interface CYGINT_LIBM_COMPAT {

    requires 1 == CYGINT_LIBM_COMPAT

}

cdl_option CYGSEM_LIBM_COMPAT_IEEE_ONLY {

    display       "IEEE-only"

    default_value 0

    implements    CYGINT_LIBM_COMPAT

    description   "

        The math library can be hard-coded to only

        behave in one compatibility mode - IEEE. This

        cannot be changed at run-time. IEEE mode is the

        most minimal of the compatibility modes, and so

        this will best help code size and speed, as well

        as omitting the code for other compatibility

        modes. If not defined, the math library can be

        set at run-time to any of the supported

        compatibility modes."

}

cdl_component CYGNUM_LIBM_COMPATIBILITY {

    display       "Default mode"

    flavor        booldata

    requires      CYGPKG_LIBC

    implements    CYGINT_LIBM_COMPAT

    legal_values  { "POSIX" "IEEE" "XOPEN" "SVID" }

    default_value { "POSIX" }

    define        CYGPKG_LIBM_COMPATIBILITY_DEFAULT

    description   "

        If you want to have support for more than one

        compatibility mode settable at run-time, rather

        than hard-coded IEEE mode, this component lets

        you choose which mode should be the default."

    cdl_option CYGNUM_LIBM_COMPAT_DEFAULT {

        display       "Numeric representation"

        flavor        data

        calculated   { \

            CYGNUM_LIBM_COMPATIBILITY == "POSIX" ? "CYGNUM_LIBM_COMPAT_POSIX" :\

            CYGNUM_LIBM_COMPATIBILITY == "IEEE"  ? "CYGNUM_LIBM_COMPAT_IEEE" :\

            CYGNUM_LIBM_COMPATIBILITY == "XOPEN" ? "CYGNUM_LIBM_COMPAT_XOPEN" :\

            CYGNUM_LIBM_COMPATIBILITY == "SVID"  ? "CYGNUM_LIBM_COMPAT_SVID" :\

            "" \

        }

        description     "

            This option automatically defines the default compatibility

            mode for numeric representation in terms of the values used

            to set that mode at run-time."

    }

}

cdl_option CYGFUN_LIBM_SVID3_scalb {

    display       "SVID3-style scalb()"

    default_value 1

    description   "

        SVID3 defined the scalb() function as double

        scalb(double, double) rather than double

        scalb(double, int) which is used by IBM, DEC, and

        probably others. Enabling this option chooses

        the (double, double) version. Note there is a

        function double scalbn(double, int) which is

        unaffected by this choice."

}

cdl_option CYGSYM_LIBM_NO_XOPEN_SVID_NAMESPACE_POLLUTION {

    display       "Reduce namespace pollution"

    default_value 0

    description   "

        If you do not want to use either the X/Open or

        SVID3 compatibility modes, you may want to define

        this option to reduce the chance of namespace

        pollution. This is particularly likely to occur

        here as these standards define symbols with

        names that often appear in applications, such as

        exception, DOMAIN, OVERFLOW, etc. If your

        application also used these names, it may cause

        problems."

}

cdl_option CYGSEM_LIBM_USE_STDERR {

    display       "Output to stderr for math errors"

    requires      !CYGSEM_LIBM_COMPAT_IEEE_ONLY

    requires      CYGPKG_LIBC_STDIO

    default_value 0

    description   "

        The SVID3 standard says that error

        messages should be output on the stderr console

        output stream. This option allows this ability

        to be explicitly controlled. However, this still

        only has an effect in SVID3 compatibility mode."

}