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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="Gcov%20Data%20Files">Gcov Data Files</a>,Previous: <a rel="previous" accesskey="p" href="Gcov-and-Optimization.html#Gcov%20and%20Optimization">Gcov and Optimization</a>,Up: <a rel="up" accesskey="u" href="Gcov.html#Gcov">Gcov</a><hr><br></div><h3 class="section">Brief description of <code>gcov</code> data files</h3><p><code>gcov</code> uses two files for profiling. The names of these filesare derived from the original <em>object</em> file by substituting thefile suffix with either <code>.gcno</code>, or <code>.gcda</code>. All of these filesare placed in the same directory as the object file, and contain datastored in a platform-independent format. <p>The <code>.gcno</code> file is generated when the source file is compiled withthe GCC <code>-ftest-coverage</code> option. It contains information toreconstruct the basic block graphs and assign source line numbers toblocks. <p>The <code>.gcda</code> file is generated when a program containing object filesbuilt with the GCC <code>-fprofile-arcs</code> option is executed. Aseparate <code>.gcda</code> file is created for each object file compiled withthis option. It contains arc transition counts, and some summaryinformation. <p>The full details of the file format is specified in <code>gcov-io.h</code>,and functions provided in that header file should be used to access thecoverage files. </body></html>⌨️ 快捷键说明
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