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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-54928] Investigate injection of libdeps tags via ARFLAGS</title>
                <link>https://jira.mongodb.org/browse/SERVER-54928</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51318&quot; title=&quot;whole-archive flag not being removed for certain libs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51318&quot;&gt;&lt;del&gt;SERVER-51318&lt;/del&gt;&lt;/a&gt;, a fix to link tags was made that achieved its effects by adding expansions to &lt;tt&gt;ARFLAGS&lt;/tt&gt;, but this should not have had the intended effect, since &lt;tt&gt;AR&lt;/tt&gt; isn&apos;t used at link time. Investigate why this fix has the effects it does, and see if there is another way to achieve the same thing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1638484">SERVER-54928</key>
            <summary>Investigate injection of libdeps tags via ARFLAGS</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="daniel.moody@mongodb.com">Daniel Moody</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 Mar 2021 21:36:16 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:45 +0000</updated>
                            <resolved>Tue, 30 Mar 2021 14:12:34 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Build</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3689765" author="xgen-internal-githook" created="Mon, 29 Mar 2021 19:24:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Moody&apos;, &apos;email&apos;: &apos;daniel.moody@mongodb.com&apos;, &apos;username&apos;: &apos;dmoody256&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54928&quot; title=&quot;Investigate injection of libdeps tags via ARFLAGS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54928&quot;&gt;&lt;del&gt;SERVER-54928&lt;/del&gt;&lt;/a&gt; switch no-init-global flags to be stored on node instead of env.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7c3a9eff515d5137e3f4f40bdad4744fe62b4e54&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7c3a9eff515d5137e3f4f40bdad4744fe62b4e54&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3676031" author="JIRAUSER1253549" created="Mon, 22 Mar 2021 13:46:45 +0000"  >&lt;p&gt;Code Review:&#160;&lt;a href=&quot;https://mongodbcr.appspot.com/774100017/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/774100017/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3667355" author="JIRAUSER1253549" created="Tue, 16 Mar 2021 18:53:28 +0000"  >&lt;p&gt;after some discussion on scons discord, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bdbaddog&quot; class=&quot;user-hover&quot; rel=&quot;bdbaddog&quot;&gt;bdbaddog&lt;/a&gt; suggested storing pre/post flag information on the target node in an emitter: &lt;a href=&quot;https://discord.com/channels/571796279483564041/612459756246007829/821453516672335902&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://discord.com/channels/571796279483564041/612459756246007829/821453516672335902&lt;/a&gt; &lt;/p&gt;

&lt;p&gt;This will remove the need to the ARFLAGS subst.&lt;/p&gt;</comment>
                            <comment id="3653755" author="JIRAUSER1253549" created="Tue, 9 Mar 2021 05:48:32 +0000"  >&lt;p&gt;Okay I did some digging and this is how its working:&lt;/p&gt;

&lt;p&gt;The ARFLAGS are assigned _LIBDEPS_TAGS so that all static libraries we build will run the expansions. AR is used for creating the .a libraries which are linked with the linker. One of the expansions that we assign globally is the no_global_init expansion. This needs to expand for every static library, modifying that static library node environment, to set the pre and post flags for that node environment if it has the no_global_init tag.&lt;/p&gt;

&lt;p&gt;Later in the build when we go to get the libdeps for linking with the linker, every libdep is converted to a node, and that node env checked if it has the pre and postfix flags that were set in the original expansion per static library node, and then added to the link line if necessary.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
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