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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-8897] Avoid using non-portable ##__VA_ARGS comma elision construct in mongo initializers facility</title>
                <link>https://jira.mongodb.org/browse/SERVER-8897</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We currently make use of the GCC extension that gives special behavior to the token pasted ##_&lt;em&gt;VA_ARGS&lt;/em&gt;_ expression, such that the comma before the ## is elided:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://gcc.gnu.org/onlinedocs/cpp/Variadic-Macros.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://gcc.gnu.org/onlinedocs/cpp/Variadic-Macros.html&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;While this extension is widely honored by other compilers, C99 actually introduced a specification for variadic macros, and that specification does not honor this construction.&lt;/p&gt;

&lt;p&gt;As a result, when we compile with -std=c++11 we get the C99 version of variadic macros rather than the GNU version, so the commas are no longer elided as our macros expcet and the mongo initializer stuff breaks.&lt;/p&gt;

&lt;p&gt;In the interest of avoiding non-portable compiler extensions, even if widely implemented in other compilers, we should avoid using the token-pasting trick and find another way to make the mongo initializer macros work.&lt;/p&gt;</description>
                <environment></environment>
        <key id="67661">SERVER-8897</key>
            <summary>Avoid using non-portable ##__VA_ARGS comma elision construct in mongo initializers facility</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                            <label>c++11</label>
                    </labels>
                <created>Thu, 7 Mar 2013 18:14:56 +0000</created>
                <updated>Mon, 11 Jul 2016 17:59:41 +0000</updated>
                            <resolved>Fri, 22 Mar 2013 19:36:40 +0000</resolved>
                                                    <fixVersion>2.5.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="284546" author="auto" created="Fri, 8 Mar 2013 18:18:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-03-07T19:42:30Z&apos;, u&apos;name&apos;: u&apos;Andrew Morrow&apos;, u&apos;email&apos;: u&apos;acm@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8897&quot; title=&quot;Avoid using non-portable ##__VA_ARGS comma elision construct in mongo initializers facility&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8897&quot;&gt;&lt;del&gt;SERVER-8897&lt;/del&gt;&lt;/a&gt; Don&apos;t use non-portable variadic comma elision&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/13ddc4ee6eb6717808ce3726bd3b59eb55e48b58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/13ddc4ee6eb6717808ce3726bd3b59eb55e48b58&lt;/a&gt;&lt;/p&gt;</comment>
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