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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gcc/Microsoft-Windows-Variable-Attributes.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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diff --git a/share/doc/gcc/Microsoft-Windows-Variable-Attributes.html b/share/doc/gcc/Microsoft-Windows-Variable-Attributes.html new file mode 100644 index 0000000..449f53b --- /dev/null +++ b/share/doc/gcc/Microsoft-Windows-Variable-Attributes.html @@ -0,0 +1,156 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- This file documents the use of the GNU compilers. + +Copyright (C) 1988-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with the +Invariant Sections being "Funding Free Software", the Front-Cover +Texts being (a) (see below), and with the Back-Cover Texts being (b) +(see below). A copy of the license is included in the section entitled +"GNU Free Documentation License". + +(a) The FSF's Front-Cover Text is: + +A GNU Manual + +(b) The FSF's Back-Cover Text is: + +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. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Using the GNU Compiler Collection (GCC): Microsoft Windows Variable Attributes</title> + +<meta name="description" content="Using the GNU Compiler Collection (GCC): Microsoft Windows Variable Attributes"> +<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Microsoft Windows Variable Attributes"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Indices.html#Indices" rel="index" title="Indices"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Variable-Attributes.html#Variable-Attributes" rel="up" title="Variable Attributes"> +<link href="MSP430-Variable-Attributes.html#MSP430-Variable-Attributes" rel="next" title="MSP430 Variable Attributes"> +<link href="M32R_002fD-Variable-Attributes.html#M32R_002fD-Variable-Attributes" rel="previous" title="M32R/D Variable Attributes"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en_US" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Microsoft-Windows-Variable-Attributes"></a> +<div class="header"> +<p> +Next: <a href="MSP430-Variable-Attributes.html#MSP430-Variable-Attributes" accesskey="n" rel="next">MSP430 Variable Attributes</a>, Previous: <a href="M32R_002fD-Variable-Attributes.html#M32R_002fD-Variable-Attributes" accesskey="p" rel="previous">M32R/D Variable Attributes</a>, Up: <a href="Variable-Attributes.html#Variable-Attributes" accesskey="u" rel="up">Variable Attributes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Microsoft-Windows-Variable-Attributes-1"></a> +<h4 class="subsection">6.34.9 Microsoft Windows Variable Attributes</h4> + +<p>You can use these attributes on Microsoft Windows targets. +<a href="x86-Variable-Attributes.html#x86-Variable-Attributes">x86 Variable Attributes</a> for additional Windows compatibility +attributes available on all x86 targets. +</p> +<dl compact="compact"> +<dd><a name="index-dllimport-variable-attribute"></a> +<a name="index-dllexport-variable-attribute"></a> +</dd> +<dt><code>dllimport</code></dt> +<dt><code>dllexport</code></dt> +<dd><p>The <code>dllimport</code> and <code>dllexport</code> attributes are described in +<a href="Microsoft-Windows-Function-Attributes.html#Microsoft-Windows-Function-Attributes">Microsoft Windows Function Attributes</a>. +</p> +<a name="index-selectany-variable-attribute"></a> +</dd> +<dt><code>selectany</code></dt> +<dd><p>The <code>selectany</code> attribute causes an initialized global variable to +have link-once semantics. When multiple definitions of the variable are +encountered by the linker, the first is selected and the remainder are +discarded. Following usage by the Microsoft compiler, the linker is told +<em>not</em> to warn about size or content differences of the multiple +definitions. +</p> +<p>Although the primary usage of this attribute is for POD types, the +attribute can also be applied to global C++ objects that are initialized +by a constructor. In this case, the static initialization and destruction +code for the object is emitted in each translation defining the object, +but the calls to the constructor and destructor are protected by a +link-once guard variable. +</p> +<p>The <code>selectany</code> attribute is only available on Microsoft Windows +targets. You can use <code>__declspec (selectany)</code> as a synonym for +<code>__attribute__ ((selectany))</code> for compatibility with other +compilers. +</p> +<a name="index-shared-variable-attribute"></a> +</dd> +<dt><code>shared</code></dt> +<dd><p>On Microsoft Windows, in addition to putting variable definitions in a named +section, the section can also be shared among all running copies of an +executable or DLL. For example, this small program defines shared data +by putting it in a named section <code>shared</code> and marking the section +shareable: +</p> +<div class="smallexample"> +<pre class="smallexample">int foo __attribute__((section ("shared"), shared)) = 0; + +int +main() +{ + /* <span class="roman">Read and write foo. All running + copies see the same value.</span> */ + return 0; +} +</pre></div> + +<p>You may only use the <code>shared</code> attribute along with <code>section</code> +attribute with a fully-initialized global definition because of the way +linkers work. See <code>section</code> attribute for more information. +</p> +<p>The <code>shared</code> attribute is only available on Microsoft Windows. +</p> +</dd> +</dl> + +<hr> +<div class="header"> +<p> +Next: <a href="MSP430-Variable-Attributes.html#MSP430-Variable-Attributes" accesskey="n" rel="next">MSP430 Variable Attributes</a>, Previous: <a href="M32R_002fD-Variable-Attributes.html#M32R_002fD-Variable-Attributes" accesskey="p" rel="previous">M32R/D Variable Attributes</a>, Up: <a href="Variable-Attributes.html#Variable-Attributes" accesskey="u" rel="up">Variable Attributes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |