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<a name="GDB_002fMI-Development-and-Front-Ends"></a>
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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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<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>Although <small>GDB/MI</small> is still incomplete, it is currently being used
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by a variety of front ends to <small>GDB</small>. This makes it difficult
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to introduce new functionality without breaking existing usage. This
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section tries to minimize the problems by describing how the protocol
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might change.
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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. This will allow the front end to parse the
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output according to the MI version. Apart from mi0, new versions of
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<small>GDB</small> will not support old versions of MI and it will be the
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responsibility of the front end to work with the new one.
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</p>
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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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<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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