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<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright © 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below). A copy of the license isincluded in the section entitled "GNU Free Documentation License". <p>(a) The FSF's Front-Cover Text is: <p>A GNU Manual <p>(b) The FSF's Back-Cover Text is: <p>You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller }--></style></head><body><div class="node"><p>Node: <a name="Deprecated%20Features">Deprecated Features</a>,Next: <a rel="next" accesskey="n" href="Backwards-Compatibility.html#Backwards%20Compatibility">Backwards Compatibility</a>,Previous: <a rel="previous" accesskey="p" href="Java-Exceptions.html#Java%20Exceptions">Java Exceptions</a>,Up: <a rel="up" accesskey="u" href="C---Extensions.html#C++%20Extensions">C++ Extensions</a><hr><br></div><h3 class="section">Deprecated Features</h3><p>In the past, the GNU C++ compiler was extended to experiment with newfeatures, at a time when the C++ language was still evolving. Now thatthe C++ standard is complete, some of those features are superseded bysuperior alternatives. Using the old features might cause a warning insome cases that the feature will be dropped in the future. In othercases, the feature might be gone already. <p>While the list below is not exhaustive, it documents some of the optionsthat are now deprecated: <dl><dt><code>-fexternal-templates</code> <dd><dt><code>-falt-external-templates</code> <dd>These are two of the many ways for G++ to implement templateinstantiation. See <a href="Template-Instantiation.html#Template%20Instantiation">Template Instantiation</a>. The C++ standard clearlydefines how template definitions have to be organized acrossimplementation units. G++ has an implicit instantiation mechanism thatshould work just fine for standard-conforming code. <br><dt><code>-fstrict-prototype</code> <dd><dt><code>-fno-strict-prototype</code> <dd>Previously it was possible to use an empty prototype parameter list toindicate an unspecified number of parameters (like C), rather than noparameters, as C++ demands. This feature has been removed, except whereit is required for backwards compatibility See <a href="Backwards-Compatibility.html#Backwards%20Compatibility">Backwards Compatibility</a>. </dl> <p>The named return value extension has been deprecated, and is nowremoved 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 nowremoved from G++. <p>The use of default arguments in function pointers, function typedefs andand other places where they are not permitted by the standard isdeprecated and will be removed from a future version of G++. </body></html>⌨️ 快捷键说明
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