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115 lines
5.6 KiB
HTML
115 lines
5.6 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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Permission is granted to copy, distribute and/or modify this document
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Setting (Debugging with GDB)</title>
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<meta name="description" content="Setting (Debugging with GDB)">
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<meta name="keywords" content="Setting (Debugging with GDB)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Languages.html#Languages" rel="up" title="Languages">
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<link href="Filenames.html#Filenames" rel="next" title="Filenames">
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<link href="Languages.html#Languages" rel="prev" title="Languages">
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</head>
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<body lang="en">
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<a name="Setting"></a>
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<div class="header">
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<p>
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Next: <a href="Show.html#Show" accesskey="n" rel="next">Show</a>, Up: <a href="Languages.html#Languages" accesskey="u" rel="up">Languages</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Switching-Between-Source-Languages"></a>
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<h3 class="section">15.1 Switching Between Source Languages</h3>
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<p>There are two ways to control the working language—either have <small>GDB</small>
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set it automatically, or select it manually yourself. You can use the
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<code>set language</code> command for either purpose. On startup, <small>GDB</small>
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defaults to setting the language automatically. The working language is
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used to determine how expressions you type are interpreted, how values
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are printed, etc.
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</p>
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<p>In addition to the working language, every source file that
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<small>GDB</small> knows about has its own working language. For some object
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file formats, the compiler might indicate which language a particular
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source file is in. However, most of the time <small>GDB</small> infers the
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language from the name of the file. The language of a source file
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controls whether C<tt>++</tt> names are demangled—this way <code>backtrace</code> can
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show each frame appropriately for its own language. There is no way to
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set the language of a source file from within <small>GDB</small>, but you can
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set the language associated with a filename extension. See <a href="Show.html#Show">Displaying the Language</a>.
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</p>
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<p>This is most commonly a problem when you use a program, such
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as <code>cfront</code> or <code>f2c</code>, that generates C but is written in
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another language. In that case, make the
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program use <code>#line</code> directives in its C output; that way
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<small>GDB</small> will know the correct language of the source code of the original
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program, and will display that source code, not the generated C code.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Filenames.html#Filenames" accesskey="1">Filenames</a>:</td><td> </td><td align="left" valign="top">Filename extensions and languages.
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Manually.html#Manually" accesskey="2">Manually</a>:</td><td> </td><td align="left" valign="top">Setting the working language manually
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Automatically.html#Automatically" accesskey="3">Automatically</a>:</td><td> </td><td align="left" valign="top">Having <small>GDB</small> infer the source language
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</td></tr>
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</table>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Show.html#Show" accesskey="n" rel="next">Show</a>, Up: <a href="Languages.html#Languages" accesskey="u" rel="up">Languages</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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