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105 lines
4.6 KiB
HTML
105 lines
4.6 KiB
HTML
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<head>
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<title>Manually (Debugging with GDB)</title>
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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="Setting.html#Setting" rel="up" title="Setting">
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<link href="Automatically.html#Automatically" rel="next" title="Automatically">
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<a name="Manually"></a>
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<div class="header">
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<p>
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Next: <a href="Automatically.html#Automatically" accesskey="n" rel="next">Automatically</a>, Previous: <a href="Filenames.html#Filenames" accesskey="p" rel="prev">Filenames</a>, Up: <a href="Setting.html#Setting" accesskey="u" rel="up">Setting</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="Setting-the-Working-Language"></a>
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<h4 class="subsection">15.1.2 Setting the Working Language</h4>
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<p>If you allow <small>GDB</small> to set the language automatically,
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expressions are interpreted the same way in your debugging session and
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your program.
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</p>
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<a name="index-set-language"></a>
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<p>If you wish, you may set the language manually. To do this, issue the
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command ‘<samp>set language <var>lang</var></samp>’, where <var>lang</var> is the name of
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a language, such as
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<code>c</code> or <code>modula-2</code>.
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For a list of the supported languages, type ‘<samp>set language</samp>’.
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</p>
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<p>Setting the language manually prevents <small>GDB</small> from updating the working
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language automatically. This can lead to confusion if you try
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to debug a program when the working language is not the same as the
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source language, when an expression is acceptable to both
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languages—but means different things. For instance, if the current
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source file were written in C, and <small>GDB</small> was parsing Modula-2, a
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command such as:
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</p>
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<div class="smallexample">
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<pre class="smallexample">print a = b + c
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</pre></div>
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<p>might not have the effect you intended. In C, this means to add
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<code>b</code> and <code>c</code> and place the result in <code>a</code>. The result
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printed would be the value of <code>a</code>. In Modula-2, this means to compare
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<code>a</code> to the result of <code>b+c</code>, yielding a <code>BOOLEAN</code> value.
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</p>
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