78 lines
3.6 KiB
HTML
78 lines
3.6 KiB
HTML
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<html lang="en">
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<head>
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<title>Manually - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Setting.html#Setting" title="Setting">
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<link rel="prev" href="Filenames.html#Filenames" title="Filenames">
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Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``Free Software'' and ``Free Software Needs
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Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: ``You are free to copy and modify
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<body>
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<div class="node">
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<a name="Manually"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Automatically.html#Automatically">Automatically</a>,
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Previous: <a rel="previous" accesskey="p" href="Filenames.html#Filenames">Filenames</a>,
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Up: <a rel="up" accesskey="u" href="Setting.html#Setting">Setting</a>
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<hr>
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</div>
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<h4 class="subsection">15.1.2 Setting the Working Language</h4>
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<p>If you allow <span class="sc">gdb</span> 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><a name="index-set-language-967"></a>If you wish, you may set the language manually. To do this, issue the
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command ‘<samp><span class="samp">set language </span><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><span class="samp">set language</span></samp>’.
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<p>Setting the language manually prevents <span class="sc">gdb</span> 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 <span class="sc">gdb</span> was parsing Modula-2, a
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command such as:
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<pre class="smallexample"> print a = b + c
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</pre>
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<p class="noindent">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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</body></html>
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