81 lines
3.9 KiB
HTML
81 lines
3.9 KiB
HTML
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<title>Setting - Debugging with GDB</title>
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<a name="Setting"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Show.html#Show">Show</a>,
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Up: <a rel="up" accesskey="u" href="Languages.html#Languages">Languages</a>
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</div>
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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 <span class="sc">gdb</span>
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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, <span class="sc">gdb</span>
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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>In addition to the working language, every source file that
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<span class="sc">gdb</span> 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 <span class="sc">gdb</span> 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 <span class="sc">gdb</span>, 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>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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<span class="sc">gdb</span> 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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<ul class="menu">
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<li><a accesskey="1" href="Filenames.html#Filenames">Filenames</a>: Filename extensions and languages.
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<li><a accesskey="2" href="Manually.html#Manually">Manually</a>: Setting the working language manually
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<li><a accesskey="3" href="Automatically.html#Automatically">Automatically</a>: Having <span class="sc">gdb</span> infer the source language
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</ul>
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</body></html>
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