arm-2011.03/share/doc/arm-arm-none-linux-gnueabi/html/gcc/Deprecated-Features.html - nest-cam/v366/arm-none-linux-gnueabi-i686-pc-linux-gnu - Git at Google

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 <a name="Deprecated-Features"></a>
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 Previous:&nbsp;<a rel="previous" accesskey="p" href="Java-Exceptions.html#Java-Exceptions">Java Exceptions</a>,
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 <h3 class="section">7.11 Deprecated Features</h3>

 <p>In the past, the GNU C++ compiler was extended to experiment with new
 features, at a time when the C++ language was still evolving.  Now that
 the C++ standard is complete, some of those features are superseded by
 superior alternatives.  Using the old features might cause a warning in
 some cases that the feature will be dropped in the future.  In other
 cases, the feature might be gone already.

  <p>While the list below is not exhaustive, it documents some of the options
 that are now deprecated:

      <dl>
 <dt><code>-fexternal-templates</code><dt><code>-falt-external-templates</code><dd>These are two of the many ways for G++ to implement template
 instantiation.  See <a href="Template-Instantiation.html#Template-Instantiation">Template Instantiation</a>.  The C++ standard clearly
 defines how template definitions have to be organized across
 implementation units.  G++ has an implicit instantiation mechanism that
 should work just fine for standard-conforming code.

      <br><dt><code>-fstrict-prototype</code><dt><code>-fno-strict-prototype</code><dd>Previously it was possible to use an empty prototype parameter list to
 indicate an unspecified number of parameters (like C), rather than no
 parameters, as C++ demands.  This feature has been removed, except where
 it is required for backwards compatibility.   See <a href="Backwards-Compatibility.html#Backwards-Compatibility">Backwards Compatibility</a>.
 </dl>

  <p>G++ allows a virtual function returning &lsquo;<samp><span class="samp">void *</span></samp>&rsquo; to be overridden
 by one returning a different pointer type.  This extension to the
 covariant return type rules is now deprecated and will be removed from a
 future version.

  <p>The G++ minimum and maximum operators (&lsquo;<samp><span class="samp">&lt;?</span></samp>&rsquo; and &lsquo;<samp><span class="samp">&gt;?</span></samp>&rsquo;) and
 their compound forms (&lsquo;<samp><span class="samp">&lt;?=</span></samp>&rsquo;) and &lsquo;<samp><span class="samp">&gt;?=</span></samp>&rsquo;) have been deprecated
 and are now removed from G++.  Code using these operators should be
 modified to use <code>std::min</code> and <code>std::max</code> instead.

  <p>The named return value extension has been deprecated, and is now
 removed from G++.

  <p>The use of initializer lists with new expressions has been deprecated,
 and is now removed from G++.

  <p>Floating and complex non-type template parameters have been deprecated,
 and are now removed from G++.

  <p>The implicit typename extension has been deprecated and is now
 removed from G++.

  <p>The use of default arguments in function pointers, function typedefs
 and other places where they are not permitted by the standard is
 deprecated and will be removed from a future version of G++.

  <p>G++ allows floating-point literals to appear in integral constant expressions,
 e.g. &lsquo;<samp><span class="samp"> enum E { e = int(2.2 * 3.7) } </span></samp>&rsquo;
 This extension is deprecated and will be removed from a future version.

  <p>G++ allows static data members of const floating-point type to be declared
 with an initializer in a class definition. The standard only allows
 initializers for static members of const integral types and const
 enumeration types so this extension has been deprecated and will be removed
 from a future version.

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	Previous: <a rel="previous" accesskey="p" href="Java-Exceptions.html#Java-Exceptions">Java Exceptions</a>,
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	<hr>
	</div>

	<h3 class="section">7.11 Deprecated Features</h3>

	<p>In the past, the GNU C++ compiler was extended to experiment with new
	features, at a time when the C++ language was still evolving. Now that
	the C++ standard is complete, some of those features are superseded by
	superior alternatives. Using the old features might cause a warning in
	some cases that the feature will be dropped in the future. In other
	cases, the feature might be gone already.

	<p>While the list below is not exhaustive, it documents some of the options
	that are now deprecated:

	<dl>
	<dt><code>-fexternal-templates</code><dt><code>-falt-external-templates</code><dd>These are two of the many ways for G++ to implement template
	instantiation. See <a href="Template-Instantiation.html#Template-Instantiation">Template Instantiation</a>. The C++ standard clearly
	defines how template definitions have to be organized across
	implementation units. G++ has an implicit instantiation mechanism that
	should work just fine for standard-conforming code.

	<br><dt><code>-fstrict-prototype</code><dt><code>-fno-strict-prototype</code><dd>Previously it was possible to use an empty prototype parameter list to
	indicate an unspecified number of parameters (like C), rather than no
	parameters, as C++ demands. This feature has been removed, except where
	it is required for backwards compatibility. See <a href="Backwards-Compatibility.html#Backwards-Compatibility">Backwards Compatibility</a>.
	</dl>

	<p>G++ allows a virtual function returning ‘<samp><span class="samp">void *</span></samp>’ to be overridden
	by one returning a different pointer type. This extension to the
	covariant return type rules is now deprecated and will be removed from a
	future version.

	<p>The G++ minimum and maximum operators (‘<samp><span class="samp"><?</span></samp>’ and ‘<samp><span class="samp">>?</span></samp>’) and
	their compound forms (‘<samp><span class="samp"><?=</span></samp>’) and ‘<samp><span class="samp">>?=</span></samp>’) have been deprecated
	and are now removed from G++. Code using these operators should be
	modified to use <code>std::min</code> and <code>std::max</code> instead.

	<p>The named return value extension has been deprecated, and is now
	removed from G++.

	<p>The use of initializer lists with new expressions has been deprecated,
	and is now removed from G++.

	<p>Floating and complex non-type template parameters have been deprecated,
	and are now removed from G++.

	<p>The implicit typename extension has been deprecated and is now
	removed from G++.

	<p>The use of default arguments in function pointers, function typedefs
	and other places where they are not permitted by the standard is
	deprecated and will be removed from a future version of G++.

	<p>G++ allows floating-point literals to appear in integral constant expressions,
	e.g. ‘<samp><span class="samp"> enum E { e = int(2.2 * 3.7) } </span></samp>’
	This extension is deprecated and will be removed from a future version.

	<p>G++ allows static data members of const floating-point type to be declared
	with an initializer in a class definition. The standard only allows
	initializers for static members of const integral types and const
	enumeration types so this extension has been deprecated and will be removed
	from a future version.

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