mingw/info/gdb/Setting.html

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  12 Node:<a name="Setting">Setting</a>,
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  18 <h3 class="section">Switching between source languages</h3>
  19
  20    <p>There are two ways to control the working language--either have GDB
  21 set it automatically, or select it manually yourself.  You can use the
  22 <code>set language</code> command for either purpose.  On startup, GDB
  23 defaults to setting the language automatically.  The working language is
  24 used to determine how expressions you type are interpreted, how values
  25 are printed, etc.
  26
  27    <p>In addition to the working language, every source file that
  28 GDB knows about has its own working language.  For some object
  29 file formats, the compiler might indicate which language a particular
  30 source file is in.  However, most of the time GDB infers the
  31 language from the name of the file.  The language of a source file
  32 controls whether C<tt>++</tt> names are demangled--this way <code>backtrace</code> can
  33 show each frame appropriately for its own language.  There is no way to
  34 set the language of a source file from within GDB, but you can
  35 set the language associated with a filename extension.  See <a href="Show.html#Show">Displaying the language</a>.
  36
  37    <p>This is most commonly a problem when you use a program, such
  38 as <code>cfront</code> or <code>f2c</code>, that generates C but is written in
  39 another language.  In that case, make the
  40 program use <code>#line</code> directives in its C output; that way
  41 GDB will know the correct language of the source code of the original
  42 program, and will display that source code, not the generated C code.
  43
  44 <ul class="menu">
  45 <li><a accesskey="1" href="Filenames.html#Filenames">Filenames</a>:                    Filename extensions and languages.
  46 <li><a accesskey="2" href="Manually.html#Manually">Manually</a>:                     Setting the working language manually
  47 <li><a accesskey="3" href="Automatically.html#Automatically">Automatically</a>:                Having GDB infer the source language
  48 </ul>
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