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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="Keyword%20Index">Keyword Index</a>,Previous: <a rel="previous" accesskey="p" href="Option-Index.html#Option%20Index">Option Index</a>,Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a><hr><br></div><h2 class="unnumbered">Keyword Index</h2><ul class="index-cp" compact><li><code>!</code> in constraint: <a href="Multi-Alternative.html#Multi-Alternative">Multi-Alternative</a><li><code>#</code> in constraint: <a href="Modifiers.html#Modifiers">Modifiers</a><li>#pragma: <a href="Pragmas.html#Pragmas">Pragmas</a><li><code>#pragma implementation</code>: <a href="C---Interface.html#C++%20Interface">C++ Interface</a><li><code>#pragma implementation</code>, implied: <a href="C---Interface.html#C++%20Interface">C++ Interface</a><li><code>#pragma interface</code>: <a href="C---Interface.html#C++%20Interface">C++ Interface</a><li><code>#pragma</code>, reason for not using: <a href="Function-Attributes.html#Function%20Attributes">Function Attributes</a><li>$: <a href="Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a><li><code>%</code> in constraint: <a href="Modifiers.html#Modifiers">Modifiers</a><li>%include: <a href="Spec-Files.html#Spec%20Files">Spec Files</a><li>%include_noerr: <a href="Spec-Files.html#Spec%20Files">Spec Files</a><li>%rename: <a href="Spec-Files.html#Spec%20Files">Spec Files</a><li><code>&</code> in constraint: <a href="Modifiers.html#Modifiers">Modifiers</a><li>': <a href="Incompatibilities.html#Incompatibilities">Incompatibilities</a><li><code>*</code> in constraint: <a href="Modifiers.html#Modifiers">Modifiers</a><li><code>+</code> in constraint: <a href="Modifiers.html#Modifiers">Modifiers</a><li><code>-lgcc</code>, use with <code>-nodefaultlibs</code>: <a href="Link-Options.html#Link%20Options">Link Options</a><li><code>-lgcc</code>, use with <code>-nostdlib</code>: <a href="Link-Options.html#Link%20Options">Link Options</a><li><code>-nodefaultlibs</code> and unresolved references: <a href="Link-Options.html#Link%20Options">Link Options</a><li><code>-nostdlib</code> and unresolved references: <a href="Link-Options.html#Link%20Options">Link Options</a><li>.sdata/.sdata2 references (PowerPC): <a href="RS-6000-and-PowerPC-Options.html#RS%2f6000%20and%20PowerPC%20Options">RS/6000 and PowerPC Options</a><li>//: <a href="C---Comments.html#C++%20Comments">C++ Comments</a><li><code>0</code> in constraint: <a href="Simple-Constraints.html#Simple%20Constraints">Simple Constraints</a><li><code><</code> in constraint: <a href="Simple-Constraints.html#Simple%20Constraints">Simple Constraints</a><li><code><?</code>: <a href="Min-and-Max.html#Min%20and%20Max">Min and Max</a><li><code>=</code> in constraint: <a href="Modifiers.html#Modifiers">Modifiers</a><li><code>></code> in constraint: <a href="Simple-Constraints.html#Simple%20Constraints">Simple Constraints</a><li><code>>?</code>: <a href="Min-and-Max.html#Min%20and%20Max">Min and Max</a><li><code>?</code> in constraint: <a href="Multi-Alternative.html#Multi-Alternative">Multi-Alternative</a><li><code>?:</code> extensions: <a href="Conditionals.html#Conditionals">Conditionals</a><li>?: side effect: <a href="Conditionals.html#Conditionals">Conditionals</a><li><code>_</code> in variables in macros: <a href="Typeof.html#Typeof">Typeof</a><li><code>__builtin_apply</code>: <a href="Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a><li><code>__builtin_apply_args</code>: <a href="Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a><li><code>__builtin_choose_expr</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_clz</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_clzl</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_clzll</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_constant_p</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_ctz</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_ctzl</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_ctzll</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_expect</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_ffs</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_ffsl</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_ffsll</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_frame_address</code>: <a href="Return-Address.html#Return%20Address">Return Address</a><li><code>__builtin_huge_val</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_huge_valf</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_huge_vall</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_inf</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_inff</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_infl</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_isgreater</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_isgreaterequal</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_isless</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_islessequal</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_islessgreater</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_isunordered</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_nan</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_nanf</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_nanl</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_nans</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_nansf</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_nansl</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_parity</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_parityl</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_parityll</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_popcount</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_popcountl</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_popcountll</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_prefetch</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__builtin_return</code>: <a href="Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a><li><code>__builtin_return_address</code>: <a href="Return-Address.html#Return%20Address">Return Address</a><li><code>__builtin_types_compatible_p</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>__complex__</code> keyword: <a href="Complex.html#Complex">Complex</a><li><code>__declspec(dllexport)</code>: <a href="Function-Attributes.html#Function%20Attributes">Function Attributes</a><li><code>__declspec(dllimport)</code>: <a href="Function-Attributes.html#Function%20Attributes">Function Attributes</a><li><code>__extension__</code>: <a href="Alternate-Keywords.html#Alternate%20Keywords">Alternate Keywords</a><li><code>__func__</code> identifier: <a href="Function-Names.html#Function%20Names">Function Names</a><li><code>__FUNCTION__</code> identifier: <a href="Function-Names.html#Function%20Names">Function Names</a><li><code>__imag__</code> keyword: <a href="Complex.html#Complex">Complex</a><li><code>__PRETTY_FUNCTION__</code> identifier: <a href="Function-Names.html#Function%20Names">Function Names</a><li><code>__real__</code> keyword: <a href="Complex.html#Complex">Complex</a><li><code>__STDC_HOSTED__</code>: <a href="Standards.html#Standards">Standards</a><li>__thread: <a href="Thread-Local.html#Thread-Local">Thread-Local</a><li><code>_Complex</code> keyword: <a href="Complex.html#Complex">Complex</a><li><code>_exit</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>_Exit</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li>ABI: <a href="Compatibility.html#Compatibility">Compatibility</a><li><code>abort</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li><code>abs</code>: <a href="Other-Builtins.html#Other%20Builtins">Other Builtins</a><li>accessing 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