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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 &copy; 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:&nbsp;<a name="Warnings%20and%20Errors">Warnings and Errors</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="Non-bugs.html#Non-bugs">Non-bugs</a>,Up:&nbsp;<a rel="up" accesskey="u" href="Trouble.html#Trouble">Trouble</a><hr><br></div><h3 class="section">Warning Messages and Error Messages</h3><p>The GNU compiler can produce two kinds of diagnostics: errors andwarnings.  Each kind has a different purpose:     <ul><li><dfn>Errors</dfn> report problems that make it impossible to compile yourprogram.  GCC reports errors with the source file name and linenumber where the problem is apparent.     <li><dfn>Warnings</dfn> report other unusual conditions in your code that<em>may</em> indicate a problem, although compilation can (and does)proceed.  Warning messages also report the source file name and linenumber, but include the text <code>warning:</code> to distinguish themfrom error messages. </ul>   <p>Warnings may indicate danger points where you should check to make surethat your program really does what you intend; or the use of obsoletefeatures; or the use of nonstandard features of GNU C or C++.  Manywarnings are issued only if you ask for them, with one of the <code>-W</code>options (for instance, <code>-Wall</code> requests a variety of usefulwarnings).   <p>GCC always tries to compile your program if possible; it nevergratuitously rejects a program whose meaning is clear merely because(for instance) it fails to conform to a standard.  In some cases,however, the C and C++ standards specify that certain extensions areforbidden, and a diagnostic <em>must</em> be issued by a conformingcompiler.  The <code>-pedantic</code> option tells GCC to issue warnings insuch cases; <code>-pedantic-errors</code> says to make them errors instead. This does not mean that <em>all</em> non-ISO constructs get warningsor errors.   <p>See <a href="Warning-Options.html#Warning%20Options">Options to Request or Suppress Warnings</a>, formore detail on these and related command-line options.   </body></html>
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