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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>
    </build-info>


<item>
            <title>[SERVER-31016] return type &apos;std::__1::cv_status&apos; must match previous return type &apos;std::__1::cv_status::__lx&apos; when lambda expression has unspecified explicit return type</title>
                <link>https://jira.mongodb.org/browse/SERVER-31016</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongodb 3.4.7 fails to build on OS X 10.8 with the compiler &quot;Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)&quot; from Xcode 5.1.1; here is a build log:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://build.macports.org/builders/ports-10.8_x86_64_legacy-builder/builds/35112/steps/install-port/logs/stdio&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://build.macports.org/builders/ports-10.8_x86_64_legacy-builder/builds/35112/steps/install-port/logs/stdio&lt;/a&gt;&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;src/mongo/db/operation_context.cpp:335:13: error: return type &apos;std::__1::cv_status&apos; must match previous return type &apos;std::__1::cv_status::__lx&apos; when lambda expression has unspecified explicit return type&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            return cv.wait_until(m, deadline.toSystemTimePoint());&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            ^&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;src/mongo/db/operation_context.cpp:340:9: error: return type &apos;stdx::cv_status&apos; (aka &apos;std::__1::cv_status&apos;) must match previous return type &apos;std::__1::cv_status::__lx&apos; when lambda expression has unspecified explicit return type&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        return cvWaitUntilWithClockSource(clockSource, cv, m, deadline);&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        ^&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;src/mongo/db/operation_context.cpp:366:12: error: no viable conversion from &apos;const std::__1::cv_status::__lx&apos; to &apos;StatusWith&amp;lt;stdx::cv_status&amp;gt;&apos;&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    return waitStatus;&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           ^~~~~~~~~~&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The same version builds fine on OS X 10.9 with the compiler &quot;Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)&quot; from Xcode 6.2. Here is that build log:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://build.macports.org/builders/ports-10.9_x86_64-builder/builds/34415/steps/install-port/logs/stdio&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://build.macports.org/builders/ports-10.9_x86_64-builder/builds/34415/steps/install-port/logs/stdio&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The same version also builds fine on OS X 10.7 with clang 3.9.1 as installed by MacPorts. Here is that build log:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://build.macports.org/builders/ports-10.7_x86_64_legacy-builder/builds/40825/steps/install-port/logs/stdio&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://build.macports.org/builders/ports-10.7_x86_64_legacy-builder/builds/40825/steps/install-port/logs/stdio&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;If necessary, we can tell MacPorts to build mongodb with a newer clang on OS X 10.8 as well, but previous versions of mongodb built fine on OS X 10.8 with clang from Xcode so I wanted to let you know in case this is a bug.&lt;/p&gt;</description>
                <environment></environment>
        <key id="425779">SERVER-31016</key>
            <summary>return type &apos;std::__1::cv_status&apos; must match previous return type &apos;std::__1::cv_status::__lx&apos; when lambda expression has unspecified explicit return type</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="ryandesign">Ryan Schmidt</reporter>
                        <labels>
                    </labels>
                <created>Sat, 9 Sep 2017 15:07:00 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:43 +0000</updated>
                            <resolved>Thu, 2 Nov 2017 20:59:40 +0000</resolved>
                                    <version>3.4.7</version>
                                    <fixVersion>3.4.11</fixVersion>
                                    <component>Build</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1715986" author="xgen-internal-githook" created="Thu, 2 Nov 2017 20:58:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Morrow&apos;, &apos;username&apos;: &apos;acmorrow&apos;, &apos;email&apos;: &apos;acm@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31016&quot; title=&quot;return type &amp;#39;std::__1::cv_status&amp;#39; must match previous return type &amp;#39;std::__1::cv_status::__lx&amp;#39; when lambda expression has unspecified explicit return type&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31016&quot;&gt;&lt;del&gt;SERVER-31016&lt;/del&gt;&lt;/a&gt; Be more explicit about some lambda return types&lt;/p&gt;

&lt;p&gt;Apparently, XCode 5&apos;s clang can&apos;t see that the two return arms&lt;br/&gt;
have the same type. Provide explicit return types to work around.&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8c9429d4a94b8c153e057cf18b955a66612f8100&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8c9429d4a94b8c153e057cf18b955a66612f8100&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1715564" author="ryandesign" created="Thu, 2 Nov 2017 16:28:17 +0000"  >&lt;p&gt;Yes, I&apos;ll do that.&lt;/p&gt;</comment>
                            <comment id="1715556" author="acm" created="Thu, 2 Nov 2017 16:24:13 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ryandesign&quot; class=&quot;user-hover&quot; rel=&quot;ryandesign&quot;&gt;ryandesign&lt;/a&gt; - Sure, I&apos;ll apply the patch and run it through our CI system to ensure that it doesn&apos;t break anything. I won&apos;t really be able to confirm that it still works with XCode 5 easily. I&apos;ll ping the ticket once I&apos;ve committed a fix. After that would you mind confirming for me that it fixes things on your side?&lt;/p&gt;</comment>
                            <comment id="1714099" author="ryandesign" created="Tue, 31 Oct 2017 22:16:08 +0000"  >&lt;p&gt;I would prefer not to. Aside from my dislike of git and the inconvenience of creating pull requests, I would prefer not to be listed as the author of changes you wrote and which are in a language I don&apos;t understand. I&apos;ll attach the patch I used here though if you want to commit it.&lt;/p&gt;</comment>
                            <comment id="1714093" author="acm" created="Tue, 31 Oct 2017 22:07:06 +0000"  >&lt;p&gt;Awesome. Want to send us a PR?&lt;/p&gt;</comment>
                            <comment id="1714053" author="ryandesign" created="Tue, 31 Oct 2017 21:32:56 +0000"  >&lt;p&gt;I think I&apos;ve understood enough about lambdas now to guess that this is the additional change you&apos;re suggesting:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;--- src/mongo/db/operation_context_test.cpp.orig        2017-10-18 11:01:51.000000000 -0500&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+++ src/mongo/db/operation_context_test.cpp     2017-10-31 16:03:27.000000000 -0500&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;@@ -231,7 +231,7 @@&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                                                  Date_t maxTime) {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; &lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;         auto barrier = std::make_shared&amp;lt;unittest::Barrier&amp;gt;(2);&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-        auto task = stdx::packaged_task&amp;lt;stdx::cv_status()&amp;gt;([=] {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+        auto task = stdx::packaged_task&amp;lt;stdx::cv_status()&amp;gt;([=]() -&amp;gt; stdx::cv_status {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;             if (maxTime &amp;lt; Date_t::max()) {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                 txn-&amp;gt;setDeadlineByDate(maxTime);&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;             }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;With that additional change, it builds! Thanks!&lt;/p&gt;</comment>
                            <comment id="1713848" author="acm" created="Tue, 31 Oct 2017 18:44:22 +0000"  >&lt;p&gt;I think the same fix will work there: just give the lambda passed into the &lt;tt&gt;packaged_task&lt;/tt&gt; a trailing return type of &lt;tt&gt;stdx::cv_status&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="1712049" author="ryandesign" created="Sun, 29 Oct 2017 13:40:51 +0000"  >&lt;p&gt;Thanks for your help; sorry I didn&apos;t respond sooner. The patch you provided allows compilation to proceed further, but fails later with a similar error:&lt;/p&gt;



&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;:info:build src/mongo/db/operation_context_test.cpp:245:17: error: return type &apos;std::__1::cv_status::__lx&apos; must match previous return type &apos;stdx::cv_status&apos; (aka &apos;std::__1::cv_status&apos;) when lambda expression has unspecified explicit return type&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;:info:build                 return stdx::cv_status::no_timeout;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;:info:build                 ^&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="1701432" author="acm" created="Tue, 17 Oct 2017 16:37:17 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ryandesign&quot; class=&quot;user-hover&quot; rel=&quot;ryandesign&quot;&gt;ryandesign&lt;/a&gt; - I&apos;m closing this ticket because there has been no activity on it for some time. I assume that you have either applied a local patch to address the issue, or that this is no longer a problem for you for other reasons. Please feel free to re-open the ticket or comment on it if there is additional help I can provide.&lt;/p&gt;</comment>
                            <comment id="1693685" author="acm" created="Mon, 9 Oct 2017 20:28:12 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ryandesign&quot; class=&quot;user-hover&quot; rel=&quot;ryandesign&quot;&gt;ryandesign&lt;/a&gt; - Just circling back to this ticket to see if you were able to verify my proposed fix. If so I would still encourage you to open a PR.&lt;/p&gt;</comment>
                            <comment id="1677504" author="acm" created="Wed, 20 Sep 2017 13:46:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ryandesign&quot; class=&quot;user-hover&quot; rel=&quot;ryandesign&quot;&gt;ryandesign&lt;/a&gt; - Were you able to test out my suggested change? Did it fix the issue for you?&lt;/p&gt;</comment>
                            <comment id="1672952" author="acm" created="Thu, 14 Sep 2017 15:55:41 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ryandesign&quot; class=&quot;user-hover&quot; rel=&quot;ryandesign&quot;&gt;ryandesign&lt;/a&gt; - &lt;/p&gt;

&lt;p&gt;I had something like this in mind: &lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;diff --git a/src/mongo/db/operation_context.cpp b/src/mongo/db/operation_context.cpp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;index 8151fe97df..41b54eb661 100644&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;--- a/src/mongo/db/operation_context.cpp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+++ b/src/mongo/db/operation_context.cpp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;@@ -325,7 +325,7 @@ StatusWith&amp;lt;stdx::cv_status&amp;gt; OperationContext::waitForConditionOrInterruptNoAsser&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;         deadline = std::min(deadline, getDeadline());&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-    const auto waitStatus = [&amp;amp;] {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+    const auto waitStatus = [&amp;amp;]() -&amp;gt; stdx::cv_status {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;         if (Date_t::max() == deadline) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;             cv.wait(m);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;             return stdx::cv_status::no_timeout;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Note also that this appears to only affect the v3.4 branch (well, maybe 3.2 as well but I didn&apos;t check) - this code has changed in master. So if you validate this fix, please create a GitHub PR against the v3.4 branch, and I can run it through our CI loop and get it merged.&lt;/p&gt;</comment>
                            <comment id="1672167" author="ryandesign" created="Wed, 13 Sep 2017 18:35:28 +0000"  >&lt;p&gt;I&apos;d be happy to try out some changes, but I haven&apos;t used the C++ features you mentioned so I&apos;m not sure what changes to make. Could you attach possible diffs to this issue for me to try?&lt;/p&gt;</comment>
                            <comment id="1671947" author="acm" created="Wed, 13 Sep 2017 15:44:30 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ryandesign&quot; class=&quot;user-hover&quot; rel=&quot;ryandesign&quot;&gt;ryandesign&lt;/a&gt; - Thanks for the bug report.&lt;/p&gt;

&lt;p&gt;You have identified a weakness in our current CI environment, in that we don&apos;t actually build on macOS 10.8 with XCode 5. We set it as the minimum compiler version that we enforce, but I believe we actually do the official 3.4 builds with XCode 7 on a much newer macOS version, so this slipped by us.&lt;/p&gt;

&lt;p&gt;Given that, we don&apos;t really have a straightforward way to validate a fix for this. However, I &lt;b&gt;think&lt;/b&gt; that the answer to this is probably as simple as either giving the lambda a trailing return type of &lt;tt&gt;stdx::cv_status&lt;/tt&gt;, or wrapping the call to &lt;tt&gt;cv.wait_until&lt;/tt&gt; in a &lt;tt&gt;stdx::cv_status&lt;/tt&gt; constructor.&lt;/p&gt;

&lt;p&gt;It is interesting to me that the more recent compilers can see that this code is fine, so I suspect that this is really a bug in Xcode 5. Since you are in a position to repro with the configuration that you have, would you mind trying out one of the above suggestions, and, if one of them works, posting a CR? We will be able to get that merged as long as it tests clean in our CI system.&lt;/p&gt;

&lt;p&gt;Also, an FYI that MongoDB 3.5 (soon to be 3.6) has bumped the minimum to Xcode 8.&lt;/p&gt;</comment>
                            <comment id="1668726" author="ryandesign" created="Sat, 9 Sep 2017 15:09:07 +0000"  >&lt;p&gt;I should be more specific about versions: mongodb 3.2.x built fine on OS X 10.8 with clang from Xcode. mongodb 3.4.0 and later don&apos;t.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="169869" name="lambda-return-type.patch" size="1156" author="ryandesign" created="Tue, 31 Oct 2017 22:16:30 +0000"/>
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