mingw/info/gdb/Manually.html

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  19 <h4 class="subsection">Setting the working language</h4>
  20
  21    <p>If you allow GDB to set the language automatically,
  22 expressions are interpreted the same way in your debugging session and
  23 your program.
  24
  25    <p>If you wish, you may set the language manually.  To do this, issue the
  26 command <code>set language </code><var>lang</var><code></code>, where <var>lang</var> is the name of
  27 a language, such as
  28 <code>c</code> or <code>modula-2</code>.
  29 For a list of the supported languages, type <code>set language</code>.
  30
  31    <p>Setting the language manually prevents GDB from updating the working
  32 language automatically.  This can lead to confusion if you try
  33 to debug a program when the working language is not the same as the
  34 source language, when an expression is acceptable to both
  35 languages--but means different things.  For instance, if the current
  36 source file were written in C, and GDB was parsing Modula-2, a
  37 command such as:
  38
  39 <pre class="example">     print a = b + c
  40      </pre>
  41
  42 <p>might not have the effect you intended.  In C, this means to add
  43 <code>b</code> and <code>c</code> and place the result in <code>a</code>.  The result
  44 printed would be the value of <code>a</code>.  In Modula-2, this means to compare
  45 <code>a</code> to the result of <code>b+c</code>, yielding a <code>BOOLEAN</code> value.
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