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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-67069] Pass /Zc:lambda to MSVC</title>
                <link>https://jira.mongodb.org/browse/SERVER-67069</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Until we are on C+&lt;ins&gt;20, we should pass &lt;a href=&quot;https://docs.microsoft.com/en-us/cpp/build/reference/zc-lambda?view=msvc-170&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;/Zc:lambda&lt;/tt&gt;&lt;/a&gt; to msvc. It is implied by &lt;tt&gt;/std:c&lt;/ins&gt;+20&lt;/tt&gt; and higher, but must be passed explicitly before then. It will tell msvc to use a standards-conforming lambda parser rather than whatever it is they were doing before. This was recomended by the MSVC team in response to &lt;a href=&quot;https://developercommunity.visualstudio.com/t/ICE-inheriting-from-a-lambda/10037887&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a bug&lt;/a&gt; I filed about hitting an ICE.&lt;/p&gt;

&lt;p&gt;It is probably worth doing this on any branch with a new enough MSVC that we still backport to in order to minimize surprising compiler errors when backporting. On older version of MSVC 2019 it was spelled &lt;tt&gt;/experimental:newLambdaProcessor&lt;/tt&gt;, but the documentation seems to imply that it is just a different spelling of the same flag.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2063394">SERVER-67069</key>
            <summary>Pass /Zc:lambda to MSVC</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="alex.neben@mongodb.com">Alex Neben</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Jun 2022 08:37:32 +0000</created>
                <updated>Sun, 29 Oct 2023 21:37:13 +0000</updated>
                            <resolved>Thu, 23 Jun 2022 15:42:19 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4636756" author="xgen-internal-githook" created="Thu, 23 Jun 2022 21:16:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Alexander Neben&apos;, &apos;email&apos;: &apos;alexander.neben@mongodb.com&apos;, &apos;username&apos;: &apos;IamXander&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67069&quot; title=&quot;Pass /Zc:lambda to MSVC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67069&quot;&gt;&lt;del&gt;SERVER-67069&lt;/del&gt;&lt;/a&gt; added /Zc:lambda for windows in cxx17&lt;br/&gt;
Branch: davish/&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63099&quot; title=&quot;Constant folding should not assume arithmetic is associative or commutative in the general case&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63099&quot;&gt;&lt;del&gt;SERVER-63099&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/09d251fb165d7f5976ed707a3ed16d12f6da945f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/09d251fb165d7f5976ed707a3ed16d12f6da945f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4634123" author="xgen-internal-githook" created="Thu, 23 Jun 2022 01:48:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Alexander Neben&apos;, &apos;email&apos;: &apos;alexander.neben@mongodb.com&apos;, &apos;username&apos;: &apos;IamXander&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67069&quot; title=&quot;Pass /Zc:lambda to MSVC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67069&quot;&gt;&lt;del&gt;SERVER-67069&lt;/del&gt;&lt;/a&gt; added /Zc:lambda for windows in cxx17&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/09d251fb165d7f5976ed707a3ed16d12f6da945f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/09d251fb165d7f5976ed707a3ed16d12f6da945f&lt;/a&gt;&lt;/p&gt;</comment>
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