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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-17785] Scope application of link groups to actual groups</title>
                <link>https://jira.mongodb.org/browse/SERVER-17785</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, when libdeps links in static archive mode, the build system wraps the entire list of libraries in --start-group and --end-group since there may be cycles in the dependency graph. This is very expensive, since it means that the linker must rescan libraries many times.&lt;/p&gt;

&lt;p&gt;However, many of the libraries are not actually part of a cycle, and so do not need to be re-scanned.&lt;/p&gt;

&lt;p&gt;The application of --start-group and --end-group should be scoped to actual groups.&lt;/p&gt;

&lt;p&gt;This will require that we topsort the library dependencies and groups, and that we have a way of declaring (or detecting) which libraries form groups.&lt;/p&gt;

&lt;p&gt;As an additional effect, this will make it easier to identify groups, which we can then aim to eliminate as we work towards achieving &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17783&quot; title=&quot;Library dependency graph should be acyclic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17783&quot;&gt;&lt;del&gt;SERVER-17783&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
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        <key id="192625">SERVER-17785</key>
            <summary>Scope application of link groups to actual groups</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                    </labels>
                <created>Sun, 29 Mar 2015 00:17:54 +0000</created>
                <updated>Thu, 14 Apr 2016 15:19:14 +0000</updated>
                            <resolved>Fri, 16 Oct 2015 16:05:18 +0000</resolved>
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                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1062963" author="acm" created="Fri, 16 Oct 2015 16:05:09 +0000"  >&lt;p&gt;Yes, and we should be able to do that once the graph is acyclic. We will still need the stable topsort, but I think that is achievable. We will know when it is time to implement that and drop start/end group once there are no more &apos;incomplete&apos; libdeps tags.&lt;/p&gt;</comment>
                            <comment id="1062908" author="schwerin" created="Fri, 16 Oct 2015 15:29:18 +0000"  >&lt;p&gt;Sure, we can close it. I would like to get rid of --start-group and --end-group entirely, to improve link time, at some point.&lt;/p&gt;</comment>
                            <comment id="1062894" author="acm" created="Fri, 16 Oct 2015 15:25:22 +0000"  >&lt;p&gt;I&apos;m inclined to close this ticket as wont fix. We went another direction with this via the LIBDEPS_TAGS and incomplete libraries. Andy, do you agree? I&apos;d be surprised if we actually did this work.&lt;/p&gt;</comment>
                            <comment id="867046" author="schwerin" created="Sun, 29 Mar 2015 03:33:04 +0000"  >&lt;p&gt;Note, the top sort must be stable to avoid needless relinking.&lt;/p&gt;</comment>
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