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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-73860] Add performance-unnecessary-copy-initialization clang-tidy check</title>
                <link>https://jira.mongodb.org/browse/SERVER-73860</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I&apos;ve noticed several unnecessary copies of objects occurring in our codebase, often from a misunderstanding/misuse of the auto specifier. There&apos;s an &lt;a href=&quot;https://clang.llvm.org/extra/clang-tidy/checks/performance/unnecessary-copy-initialization.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;existing clang-tidy check&lt;/a&gt; that we can leverage to cut down on extraneous copies being made.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2259658">SERVER-73860</key>
            <summary>Add performance-unnecessary-copy-initialization clang-tidy check</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="matt.kneiser@mongodb.com">Matt Kneiser</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Feb 2023 22:03:46 +0000</created>
                <updated>Fri, 2 Feb 2024 20:51:54 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5204948" author="JIRAUSER1263310" created="Thu, 16 Feb 2023 19:11:42 +0000"  >&lt;p&gt;The current version of clang-tidy in the v4 toolchain, &lt;a href=&quot;https://releases.llvm.org/12.0.0/tools/clang/tools/extra/docs/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;v12&lt;/a&gt;, is older than the tip of the llvm project, &lt;a href=&quot;https://clang.llvm.org/extra/clang-tidy/checks/performance/unnecessary-copy-initialization.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;v17&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The tip has many useful and relevant improvements to this checker. Namely:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;An additional option: &lt;tt&gt;ExcludedContainerTypes&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;A fixer&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;While some copies I found after running this tool made sense, I know that it wasn&apos;t perfect and required exclusions like in some tests where the copy constructor was explicitly being invoked.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;It might make sense to import the latest version of this tool into our custom checkers suite and modify as necessary. I began this path and found that we need better support from SDP to get all the llvm/clang headers lied up correctly so checks can be imported easily.&lt;/p&gt;</comment>
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