<h4 dir="auto">Pre-Submission Checklist</h4>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Commit message has the format required by CONTRIBUTING guide</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Commits are split per component (core, individual modules, libs, utils, ...)</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Each component has a single commit (if not, squash them into one commit)</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> No commits to README files for modules (changes must be done to docbook files<br>
in <code>doc/</code> subfolder, the README file is autogenerated)</li>
</ul>
<h4 dir="auto">Type Of Change</h4>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> New feature (non-breaking change which adds new functionality)</li>
</ul>
<h4 dir="auto">Checklist:</h4>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> PR should be backported to stable branches</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Tested changes locally</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Related to issue <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="1074595428" data-permission-text="Title is private" data-url="https://github.com/kamailio/kamailio/issues/2967" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/2967/hovercard" href="https://github.com/kamailio/kamailio/issues/2967">#2967</a></li>
</ul>
<h4 dir="auto">Description</h4>
<p dir="auto">Add new preprocessor keywords <code>trydefenv</code> and <code>trydefenvs</code> that work like <code>defenv</code> and <code>defenvs</code> respectively, with the difference that if the environmental variable is not defined, then the value in Kamailio will not be defined.</p>
<p dir="auto">For example:</p>
<div class="snippet-clipboard-content position-relative overflow-auto" data-snippet-clipboard-copy-content="#!KAMAILIO
loadmodule "xlog"
loadmodule "pv"
#!trydefenv EXTRALOG
request_route {
#!ifdef EXTRALOG
xlog("L_I", "Some Extra Logging here\n");
#!endif
forward ();
}"><pre><code>#!KAMAILIO
loadmodule "xlog"
loadmodule "pv"
#!trydefenv EXTRALOG
request_route {
#!ifdef EXTRALOG
xlog("L_I", "Some Extra Logging here\n");
#!endif
forward ();
}
</code></pre></div>
<p dir="auto">If the environmental variable <code>$EXTRALOG</code> is defined, the log line will be written. If the environmental variable is not set, then in Kamailio <code>EXTRALOG</code> will not be defined and the <code>#!ifdef</code> section will not be loaded.</p>
<hr>
<h4>You can view, comment on, or merge this pull request online at:</h4>
<p> <a href='https://github.com/kamailio/kamailio/pull/2969'>https://github.com/kamailio/kamailio/pull/2969</a></p>
<h4>Commit Summary</h4>
<ul>
<li><a href="https://github.com/kamailio/kamailio/pull/2969/commits/488f8340bebfe65d6a8615f68823bfc3b1b9a3b6" class="commit-link">488f834</a> core: cfg.lex support for undefned env vars</li>
</ul>
<h4 style="display: inline-block">File Changes </h4> <p style="display: inline-block">(<a href="https://github.com/kamailio/kamailio/pull/2969/files">2 files</a>)</p>
<ul>
<li>
<strong>M</strong>
<a href="https://github.com/kamailio/kamailio/pull/2969/files#diff-ea332ab631576daf6b8d1fed5c5a3bb0d444dab4bcfec1686878e0676c216b3e">src/core/cfg.lex</a>
(56)
</li>
<li>
<strong>M</strong>
<a href="https://github.com/kamailio/kamailio/pull/2969/files#diff-5b93873c8bf922283746970de5e46d6f81f1c163985078daf88a079215879a25">src/core/ppcfg.h</a>
(8)
</li>
</ul>
<h4>Patch Links:</h4>
<ul>
<li><a href='https://github.com/kamailio/kamailio/pull/2969.patch'>https://github.com/kamailio/kamailio/pull/2969.patch</a></li>
<li><a href='https://github.com/kamailio/kamailio/pull/2969.diff'>https://github.com/kamailio/kamailio/pull/2969.diff</a></li>
</ul>
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