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><H1
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><H1
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><A
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><A
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NAME="REF.ACTIVE-IF"><SPAN
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NAME="REF.ACTIVE-IF"><SPAN
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CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>active_if</SPAN
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>active_if</SPAN
|
></H1
|
></H1
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><DIV
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><DIV
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CLASS="REFNAMEDIV"
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CLASS="REFNAMEDIV"
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><A
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><A
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NAME="AEN3662"
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NAME="AEN3662"
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></A
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></A
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><H2
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><H2
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>Name</H2
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>Name</H2
|
>Property <SPAN
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>Property <SPAN
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CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>active_if</SPAN
|
>active_if</SPAN
|
> -- Allow additional control over the active state of an
|
> -- Allow additional control over the active state of an
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option or other CDL entity.</DIV
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option or other CDL entity.</DIV
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><DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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CLASS="REFSYNOPSISDIV"
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><A
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><A
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NAME="AEN3666"><H2
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NAME="AEN3666"><H2
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>Synopsis</H2
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>Synopsis</H2
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><TABLE
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WIDTH="70%"
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><TR
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><TR
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><TD
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><TD
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><PRE
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><PRE
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CLASS="SYNOPSIS"
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CLASS="SYNOPSIS"
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>cdl_option <name> {
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>cdl_option <name> {
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active_if <condition>
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active_if <condition>
|
…
|
…
|
}</PRE
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}</PRE
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></TD
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></TD
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></TR
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></TR
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></TABLE
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></TABLE
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></DIV
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></DIV
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><DIV
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><DIV
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CLASS="REFSECT1"
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CLASS="REFSECT1"
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><A
|
><A
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NAME="AEN3668"
|
NAME="AEN3668"
|
></A
|
></A
|
><H2
|
><H2
|
>Description</H2
|
>Description</H2
|
><P
|
><P
|
>Configuration options or other entities may be either active or
|
>Configuration options or other entities may be either active or
|
inactive. Typically this is controlled by the option's location in the
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inactive. Typically this is controlled by the option's location in the
|
overall hierarchy. Consider the option
|
overall hierarchy. Consider the option
|
<TT
|
<TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>CYGDBG_INFRA_DEBUG_PRECONDITIONS</TT
|
>CYGDBG_INFRA_DEBUG_PRECONDITIONS</TT
|
>, which exists
|
>, which exists
|
below the component <TT
|
below the component <TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>CYGDBG_USE_ASSERT</TT
|
>CYGDBG_USE_ASSERT</TT
|
>. If the whole
|
>. If the whole
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component is disabled then the options it contains are inactive: there
|
component is disabled then the options it contains are inactive: there
|
is no point in enabling preconditions unless there is generic
|
is no point in enabling preconditions unless there is generic
|
assertion support; any <SPAN
|
assertion support; any <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>requires</SPAN
|
>requires</SPAN
|
> constraints associated with
|
> constraints associated with
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preconditions are irrelevant; any <SPAN
|
preconditions are irrelevant; any <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>compile</SPAN
|
>compile</SPAN
|
> property or other
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> property or other
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build-related property is ignored.</P
|
build-related property is ignored.</P
|
><P
|
><P
|
>In some cases the hierarchy does not provide sufficient control over
|
>In some cases the hierarchy does not provide sufficient control over
|
whether or not a particular option should be active. For example, the
|
whether or not a particular option should be active. For example, the
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math library could have support for floating point exceptions which
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math library could have support for floating point exceptions which
|
is only worthwhile if the hardware implements appropriate
|
is only worthwhile if the hardware implements appropriate
|
functionality, as specified by the architectural HAL. The relevant
|
functionality, as specified by the architectural HAL. The relevant
|
math library configuration options should remain below the
|
math library configuration options should remain below the
|
<TT
|
<TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>CYGPKG_LIBM</TT
|
>CYGPKG_LIBM</TT
|
> package in the overall hierarchy, but
|
> package in the overall hierarchy, but
|
should be inactive unless there is appropriate hardware support. In
|
should be inactive unless there is appropriate hardware support. In
|
cases like this an <SPAN
|
cases like this an <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>active_if</SPAN
|
>active_if</SPAN
|
> property is appropriate.</P
|
> property is appropriate.</P
|
><P
|
><P
|
>Another common use of <SPAN
|
>Another common use of <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>active_if</SPAN
|
>active_if</SPAN
|
> properties is to avoid excessive
|
> properties is to avoid excessive
|
nesting in the configuration hierarchy. If some option B is only
|
nesting in the configuration hierarchy. If some option B is only
|
relevant if option A is enabled, it is possible to turn A into a
|
relevant if option A is enabled, it is possible to turn A into a
|
component that contains B. However adding another level to the
|
component that contains B. However adding another level to the
|
hierarchy for a component which will contain just one entry may be
|
hierarchy for a component which will contain just one entry may be
|
considered excessive. In such cases it is possible for B to have an
|
considered excessive. In such cases it is possible for B to have an
|
<SPAN
|
<SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>active_if</SPAN
|
>active_if</SPAN
|
> dependency on A.</P
|
> dependency on A.</P
|
><P
|
><P
|
><SPAN
|
><SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>active_if</SPAN
|
>active_if</SPAN
|
> takes a goal expression as argument. For details of goal
|
> takes a goal expression as argument. For details of goal
|
expression syntax see <A
|
expression syntax see <A
|
HREF="language.values.html#LANGUAGE.GOAL-EXPRESSION"
|
HREF="language.values.html#LANGUAGE.GOAL-EXPRESSION"
|
>the Section called <I
|
>the Section called <I
|
>Goal Expressions</I
|
>Goal Expressions</I
|
> in Chapter 3</A
|
> in Chapter 3</A
|
>. In
|
>. In
|
most cases the goal expression will be very simple, often involving
|
most cases the goal expression will be very simple, often involving
|
just one other option, but more complicated expressions can be used
|
just one other option, but more complicated expressions can be used
|
when appropriate. It is also possible to have multiple <SPAN
|
when appropriate. It is also possible to have multiple <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>active_if</SPAN
|
>active_if</SPAN
|
>
|
>
|
conditions in a single option, in which case all of the conditions
|
conditions in a single option, in which case all of the conditions
|
have to be satisfied if the option is to be active.</P
|
have to be satisfied if the option is to be active.</P
|
><P
|
><P
|
>The <SPAN
|
>The <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>active_if</SPAN
|
>active_if</SPAN
|
> and <SPAN
|
> and <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>requires</SPAN
|
>requires</SPAN
|
> properties have certain similarities,
|
> properties have certain similarities,
|
but they serve a different purpose. Suppose there are two options A
|
but they serve a different purpose. Suppose there are two options A
|
and B, and option B relies on functionality provided by A. This could
|
and B, and option B relies on functionality provided by A. This could
|
be expressed as either <TT
|
be expressed as either <TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>active_if A</TT
|
>active_if A</TT
|
> or as
|
> or as
|
<TT
|
<TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>requires A</TT
|
>requires A</TT
|
>. The points to note are:</P
|
>. The points to note are:</P
|
><P
|
><P
|
></P
|
></P
|
><UL
|
><UL
|
><LI
|
><LI
|
><P
|
><P
|
>If <TT
|
>If <TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>active_if A</TT
|
>active_if A</TT
|
> is used and A is disabled or
|
> is used and A is disabled or
|
inactive, then graphical tools will generally prevent any attempt at
|
inactive, then graphical tools will generally prevent any attempt at
|
modifying B. For example the text for B could be grayed out, and the
|
modifying B. For example the text for B could be grayed out, and the
|
associated checkbutton (if B is a boolean option) would be disabled.
|
associated checkbutton (if B is a boolean option) would be disabled.
|
If the user needs the functionality provided by option B then it is
|
If the user needs the functionality provided by option B then it is
|
necessary to go to option A first and manipulate it appropriately.</P
|
necessary to go to option A first and manipulate it appropriately.</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>If <TT
|
>If <TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>requires A</TT
|
>requires A</TT
|
> is used and A is disabled or
|
> is used and A is disabled or
|
inactive, graphical tools will still allow B to be manipulated and
|
inactive, graphical tools will still allow B to be manipulated and
|
enabled. This would result in a new conflict which may get resolved
|
enabled. This would result in a new conflict which may get resolved
|
automatically or which may need user intervention.</P
|
automatically or which may need user intervention.</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>If there are hardware dependencies then an <SPAN
|
>If there are hardware dependencies then an <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>active_if</SPAN
|
>active_if</SPAN
|
> condition is
|
> condition is
|
usually the preferred approach. There is no point in allowing the user
|
usually the preferred approach. There is no point in allowing the user
|
to manipulate a configuration option if the corresponding
|
to manipulate a configuration option if the corresponding
|
functionality cannot possibly work on the currently-selected hardware.
|
functionality cannot possibly work on the currently-selected hardware.
|
Much the same argument applies to coarse-grained dependencies, for
|
Much the same argument applies to coarse-grained dependencies, for
|
example if an option depends on the presence of a TCP/IP stack then an
|
example if an option depends on the presence of a TCP/IP stack then an
|
<TT
|
<TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>active_if CYGPKG_NET</TT
|
>active_if CYGPKG_NET</TT
|
> condition is appropriate:
|
> condition is appropriate:
|
it may be possible to satisfy the condition, but it requires the
|
it may be possible to satisfy the condition, but it requires the
|
fairly drastic step of loading another package; further more, if the
|
fairly drastic step of loading another package; further more, if the
|
user wanted a TCP/IP stack in the configuration then it would probably
|
user wanted a TCP/IP stack in the configuration then it would probably
|
have been loaded already. </P
|
have been loaded already. </P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>If option B exists to provide additional debugging information about
|
>If option B exists to provide additional debugging information about
|
the functionality provided by A then again an <SPAN
|
the functionality provided by A then again an <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>active_if</SPAN
|
>active_if</SPAN
|
> constraint
|
> constraint
|
is appropriate. There is no point in letting users enable extra
|
is appropriate. There is no point in letting users enable extra
|
debugging facilities for a feature that is not actually present.</P
|
debugging facilities for a feature that is not actually present.</P
|
></LI
|
></LI
|
><LI
|
><LI
|
><P
|
><P
|
>The configuration system's inference engine will cope equally well
|
>The configuration system's inference engine will cope equally well
|
with <SPAN
|
with <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>active_if</SPAN
|
>active_if</SPAN
|
> and <SPAN
|
> and <SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>requires</SPAN
|
>requires</SPAN
|
> properties. Suppose there is a
|
> properties. Suppose there is a
|
conflict because some third option depends on B. If B is
|
conflict because some third option depends on B. If B is
|
<TT
|
<TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>active_if A</TT
|
>active_if A</TT
|
> then the inference engine will
|
> then the inference engine will
|
attempt to make A active and enabled, and then to enable B if
|
attempt to make A active and enabled, and then to enable B if
|
necessary. If B <TT
|
necessary. If B <TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>requires A</TT
|
>requires A</TT
|
> then the inference
|
> then the inference
|
engine will attempt to enable B and resolve the resulting conflict by
|
engine will attempt to enable B and resolve the resulting conflict by
|
causing A to be both active and enabled. Although the inference occurs
|
causing A to be both active and enabled. Although the inference occurs
|
in a different order, in most cases the effect will be the same.</P
|
in a different order, in most cases the effect will be the same.</P
|
></LI
|
></LI
|
></UL
|
></UL
|
></DIV
|
></DIV
|
><DIV
|
><DIV
|
CLASS="REFSECT1"
|
CLASS="REFSECT1"
|
><A
|
><A
|
NAME="AEN3710"
|
NAME="AEN3710"
|
></A
|
></A
|
><H2
|
><H2
|
>Example</H2
|
>Example</H2
|
><TABLE
|
><TABLE
|
BORDER="5"
|
BORDER="5"
|
BGCOLOR="#E0E0F0"
|
BGCOLOR="#E0E0F0"
|
WIDTH="70%"
|
WIDTH="70%"
|
><TR
|
><TR
|
><TD
|
><TD
|
><PRE
|
><PRE
|
CLASS="PROGRAMLISTING"
|
CLASS="PROGRAMLISTING"
|
># Do not provide extra semaphore debugging if there are no semaphores
|
># Do not provide extra semaphore debugging if there are no semaphores
|
cdl_option CYGDBG_KERNEL_INSTRUMENT_BINSEM {
|
cdl_option CYGDBG_KERNEL_INSTRUMENT_BINSEM {
|
active_if CYGPKG_KERNEL_SYNCH
|
active_if CYGPKG_KERNEL_SYNCH
|
…
|
…
|
}
|
}
|
|
|
# Avoid another level in the configuration hierarchy
|
# Avoid another level in the configuration hierarchy
|
cdl_option CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE_SIMPLE_RELAY {
|
cdl_option CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE_SIMPLE_RELAY {
|
active_if CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE_SIMPLE
|
active_if CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE_SIMPLE
|
…
|
…
|
}
|
}
|
|
|
# Functionality that is only relevant if another package is loaded
|
# Functionality that is only relevant if another package is loaded
|
cdl_option CYGSEM_START_UITRON_COMPATIBILITY {
|
cdl_option CYGSEM_START_UITRON_COMPATIBILITY {
|
active_if CYGPKG_UITRON
|
active_if CYGPKG_UITRON
|
…
|
…
|
}
|
}
|
|
|
# Check that the hardware or HAL provide the appropriate functionality
|
# Check that the hardware or HAL provide the appropriate functionality
|
cdl_option CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT {
|
cdl_option CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT {
|
active_if CYGINT_HAL_DEBUG_GDB_STUBS_BREAK
|
active_if CYGINT_HAL_DEBUG_GDB_STUBS_BREAK
|
…
|
…
|
}</PRE
|
}</PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
></DIV
|
></DIV
|
><DIV
|
><DIV
|
CLASS="REFSECT1"
|
CLASS="REFSECT1"
|
><A
|
><A
|
NAME="AEN3713"
|
NAME="AEN3713"
|
></A
|
></A
|
><H2
|
><H2
|
>See Also</H2
|
>See Also</H2
|
><P
|
><P
|
>Property <A
|
>Property <A
|
HREF="ref.requires.html"
|
HREF="ref.requires.html"
|
><SPAN
|
><SPAN
|
CLASS="PROPERTY"
|
CLASS="PROPERTY"
|
>requires</SPAN
|
>requires</SPAN
|
></A
|
></A
|
>.</P
|
>.</P
|
></DIV
|
></DIV
|
><DIV
|
><DIV
|
CLASS="NAVFOOTER"
|
CLASS="NAVFOOTER"
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><HR
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>cdl_interface</TT
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>calculated</SPAN
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