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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

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  8. Invariant Sections being "Free Software" and "Free Software Needs

  9. Free Documentation", with the Front-Cover Texts being "A GNU Manual,"

  10. and with the Back-Cover Texts as in (a) below.

  11. 

  12. (a) The FSF's Back-Cover Text is: "You are free to copy and modify

  13. this GNU Manual.  Buying copies from GNU Press supports the FSF in

  14. developing GNU and promoting software freedom." -->

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  16. <head>

  17. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  18. <title>Manually (Debugging with GDB)</title>

  19. 

  20. <meta name="description" content="Manually (Debugging with GDB)">

  21. <meta name="keywords" content="Manually (Debugging with GDB)">

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  25. <link href="index.html#Top" rel="start" title="Top">

  26. <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">

  27. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  28. <link href="Setting.html#Setting" rel="up" title="Setting">

  29. <link href="Automatically.html#Automatically" rel="next" title="Automatically">

  30. <link href="Filenames.html#Filenames" rel="prev" title="Filenames">

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  60. </head>

  61. 

  62. <body lang="en">

  63. <a name="Manually"></a>

  64. <div class="header">

  65. <p>

  66. 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> &nbsp; [<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>

  67. </div>

  68. <hr>

  69. <a name="Setting-the-Working-Language"></a>

  70. <h4 class="subsection">15.1.2 Setting the Working Language</h4>

  71. 

  72. <p>If you allow <small>GDB</small> to set the language automatically,

  73. expressions are interpreted the same way in your debugging session and

  74. your program.

  75. </p>

  76. <a name="index-set-language"></a>

  77. <p>If you wish, you may set the language manually.  To do this, issue the

  78. command &lsquo;<samp>set language <var>lang</var></samp>&rsquo;, where <var>lang</var> is the name of

  79. a language, such as

  80. <code>c</code> or <code>modula-2</code>.

  81. For a list of the supported languages, type &lsquo;<samp>set language</samp>&rsquo;.

  82. </p>

  83. <p>Setting the language manually prevents <small>GDB</small> from updating the working

  84. language automatically.  This can lead to confusion if you try

  85. to debug a program when the working language is not the same as the

  86. source language, when an expression is acceptable to both

  87. languages&mdash;but means different things.  For instance, if the current

  88. source file were written in C, and <small>GDB</small> was parsing Modula-2, a

  89. command such as:

  90. </p>

  91. <div class="smallexample">

  92. <pre class="smallexample">print a = b + c

  93. </pre></div>

  94. 

  95. <p>might not have the effect you intended.  In C, this means to add

  96. <code>b</code> and <code>c</code> and place the result in <code>a</code>.  The result

  97. printed would be the value of <code>a</code>.  In Modula-2, this means to compare

  98. <code>a</code> to the result of <code>b+c</code>, yielding a <code>BOOLEAN</code> value.

  99. </p>

  100. 

  101. 

  102. 

  103. </body>

  104. </html>