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<title>GDB/MI Development and Front Ends (Debugging with GDB)</title>
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="GDB_002fMI.html#GDB_002fMI" rel="up" title="GDB/MI">
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<a name="GDB_002fMI-Development-and-Front-Ends"></a>
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<div class="header">
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<p>
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Next: <a href="GDB_002fMI-Output-Records.html#GDB_002fMI-Output-Records" accesskey="n" rel="next">GDB/MI Output Records</a>, Previous: <a href="GDB_002fMI-Compatibility-with-CLI.html#GDB_002fMI-Compatibility-with-CLI" accesskey="p" rel="prev">GDB/MI Compatibility with CLI</a>, Up: <a href="GDB_002fMI.html#GDB_002fMI" accesskey="u" rel="up">GDB/MI</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="GDB_002fMI-Development-and-Front-Ends-1"></a>
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<h3 class="section">27.4 <small>GDB/MI</small> Development and Front Ends</h3>
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<a name="index-GDB_002fMI-development"></a>
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<p>The application which takes the MI output and presents the state of the
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program being debugged to the user is called a <em>front end</em>.
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</p>
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<p>Since <small>GDB/MI</small> is used by a variety of front ends to <small>GDB</small>, changes
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to the MI interface may break existing usage. This section describes how the
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protocol changes and how to request previous version of the protocol when it
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does.
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</p>
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<p>Some changes in MI need not break a carefully designed front end, and
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for these the MI version will remain unchanged. The following is a
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list of changes that may occur within one level, so front ends should
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parse MI output in a way that can handle them:
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</p>
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<ul>
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<li> New MI commands may be added.
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</li><li> New fields may be added to the output of any MI command.
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</li><li> The range of values for fields with specified values, e.g.,
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<code>in_scope</code> (see <a href="GDB_002fMI-Variable-Objects.html#g_t_002dvar_002dupdate">-var-update</a>) may be extended.
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</li></ul>
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<p>If the changes are likely to break front ends, the MI version level
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will be increased by one. The new versions of the MI protocol are not compatible
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with the old versions. Old versions of MI remain available, allowing front ends
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to keep using them until they are modified to use the latest MI version.
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</p>
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<p>Since <code>--interpreter=mi</code> always points to the latest MI version, it is
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recommended that front ends request a specific version of MI when launching
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<small>GDB</small> (e.g. <code>--interpreter=mi2</code>) to make sure they get an
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interpreter with the MI version they expect.
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</p>
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<p>The following table gives a summary of the the released versions of the MI
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interface: the version number, the version of GDB in which it first appeared
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and the breaking changes compared to the previous version.
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</p>
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<table>
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<thead><tr><th width="5%">MI version</th><th width="5%">GDB version</th><th width="90%">Breaking changes</th></tr></thead>
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<tr><td width="5%"><div align="center">1
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</div></td><td width="5%"><div align="center">5.1
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</div></td><td width="90%">None</td></tr>
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<tr><td width="5%"><div align="center">2
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</div></td><td width="5%"><div align="center">6.0
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</div></td><td width="90%"><ul>
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<li> The <code>-environment-pwd</code>, <code>-environment-directory</code> and
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<code>-environment-path</code> commands now returns values using the MI output
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syntax, rather than CLI output syntax.
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</li><li> <code>-var-list-children</code>’s <code>children</code> result field is now a list, rather
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than a tuple.
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</li><li> <code>-var-update</code>’s <code>changelist</code> result field is now a list, rather than
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a tuple.
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</li></ul></td></tr>
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</table>
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<p>The best way to avoid unexpected changes in MI that might break your front
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end is to make your project known to <small>GDB</small> developers and
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follow development on <a href="mailto:gdb@sourceware.org">gdb@sourceware.org</a> and
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<a href="mailto:gdb-patches@sourceware.org">gdb-patches@sourceware.org</a>.
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<a name="index-mailing-lists"></a>
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="GDB_002fMI-Output-Records.html#GDB_002fMI-Output-Records" accesskey="n" rel="next">GDB/MI Output Records</a>, Previous: <a href="GDB_002fMI-Compatibility-with-CLI.html#GDB_002fMI-Compatibility-with-CLI" accesskey="p" rel="prev">GDB/MI Compatibility with CLI</a>, Up: <a href="GDB_002fMI.html#GDB_002fMI" accesskey="u" rel="up">GDB/MI</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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</body>
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</html>
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