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| <title>Debugging with GDB: Setting</title> |
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| <a name="Setting"></a> |
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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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| <a name="Switching-Between-Source-Languages"></a> |
| <h3 class="section">15.1 Switching Between Source Languages</h3> |
| |
| <p>There are two ways to control the working language—either have <small>GDB</small> |
| set it automatically, or select it manually yourself. You can use the |
| <code>set language</code> command for either purpose. On startup, <small>GDB</small> |
| defaults to setting the language automatically. The working language is |
| used to determine how expressions you type are interpreted, how values |
| are printed, etc. |
| </p> |
| <p>In addition to the working language, every source file that |
| <small>GDB</small> knows about has its own working language. For some object |
| file formats, the compiler might indicate which language a particular |
| source file is in. However, most of the time <small>GDB</small> infers the |
| language from the name of the file. The language of a source file |
| controls whether C<tt>++</tt> names are demangled—this way <code>backtrace</code> can |
| show each frame appropriately for its own language. There is no way to |
| set the language of a source file from within <small>GDB</small>, but you can |
| set the language associated with a filename extension. See <a href="Show.html#Show">Displaying the Language</a>. |
| </p> |
| <p>This is most commonly a problem when you use a program, such |
| as <code>cfront</code> or <code>f2c</code>, that generates C but is written in |
| another language. In that case, make the |
| program use <code>#line</code> directives in its C output; that way |
| <small>GDB</small> will know the correct language of the source code of the original |
| program, and will display that source code, not the generated C code. |
| </p> |
| <table class="menu" border="0" cellspacing="0"> |
| <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. |
| </td></tr> |
| <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 |
| </td></tr> |
| <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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