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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>[CXX-1678] std::aligned_storage build failure with extra alignment</title>
                <link>https://jira.mongodb.org/browse/CXX-1678</link>
                <project id="11980" key="CXX">C++ Driver</project>
                    <description>&lt;p&gt;Visual Studio (v15.8+) project&#160;&apos;bsoncxx&apos; (and &apos;bsoncxx_testing&apos;) generated by CMake has compile error in &apos;core.cpp&apos; (static assert in &apos;type_traits&apos;):&lt;/p&gt;
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					&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;You&apos;ve instantiated std::aligned_storage&amp;lt;Len, Align&amp;gt; with an extended alignment (in other words, Align &amp;gt; alignof(max_align_t)). Before VS &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2017&lt;/span&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;15.8&lt;/span&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;, the member type would non-conformingly have an alignment of only alignof(max_align_t). VS &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2017&lt;/span&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;15.8&lt;/span&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; was fixed to handle &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;this&lt;/span&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; correctly, but the fix inherently changes layout and breaks binary compatibility (*only* &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;for&lt;/span&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; uses of aligned_storage with extended alignments). Please define either (&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;) _ENABLE_EXTENDED_ALIGNED_STORAGE to acknowledge that you understand &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;this&lt;/span&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; message and that you actually want a type with an extended alignment, or (&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2&lt;/span&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;) _DISABLE_EXTENDED_ALIGNED_STORAGE to silence &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;this&lt;/span&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; message and get the old non-conformant behavior.&lt;/span&gt;&lt;/pre&gt;
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					&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;c:\program files (x86)\microsoft visual studio\&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2017&lt;/span&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;\enterprise\vc\tools\msvc\&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;14.15&lt;/span&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;26726&lt;/span&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;\include\type_traits&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment>Windows \ Microsoft Visual Studio 2015 v15.8+</environment>
        <key id="626149">CXX-1678</key>
            <summary>std::aligned_storage build failure with extra alignment</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="kevin.albertson@mongodb.com">Kevin Albertson</assignee>
                                    <reporter username="Azriel">Zolotov Pavel</reporter>
                        <labels>
                            <label>C++11</label>
                            <label>VisualStudio</label>
                            <label>build-failure</label>
                    </labels>
                <created>Mon, 29 Oct 2018 14:18:49 +0000</created>
                <updated>Sat, 28 Oct 2023 11:27:21 +0000</updated>
                            <resolved>Tue, 27 Nov 2018 20:24:06 +0000</resolved>
                                    <version>3.4.0</version>
                                    <fixVersion>3.5.0</fixVersion>
                                    <component>BSON</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2073786" author="azriel" created="Wed, 28 Nov 2018 07:57:55 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kevin.albertson&quot; class=&quot;user-hover&quot; rel=&quot;kevin.albertson&quot;&gt;kevin.albertson&lt;/a&gt;, thank you!&lt;/p&gt;</comment>
                            <comment id="2073296" author="kevin.albertson" created="Tue, 27 Nov 2018 20:24:00 +0000"  >&lt;p&gt;Hi Zolotov, This has been fixed on master, and should no longer require the workarounds I described above. Although it is still recommended that you configure the C driver with &lt;tt&gt;-DENABLE_EXTRA_ALIGNMENT=OFF&lt;/tt&gt; regardless.&lt;/p&gt;</comment>
                            <comment id="2073231" author="xgen-internal-githook" created="Tue, 27 Nov 2018 19:47:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Albertson&apos;, &apos;email&apos;: &apos;kevin.albertson@10gen.com&apos;, &apos;username&apos;: &apos;kevinAlbs&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CXX-1678&quot; title=&quot;std::aligned_storage build failure with extra alignment&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CXX-1678&quot;&gt;&lt;del&gt;CXX-1678&lt;/del&gt;&lt;/a&gt; Fix VS2017 build&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-cxx-driver/commit/c124f9d0b3671c8b62066510cd415af7d83ec929&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-cxx-driver/commit/c124f9d0b3671c8b62066510cd415af7d83ec929&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2054205" author="azriel" created="Wed, 7 Nov 2018 08:37:41 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kevin.albertson&quot; class=&quot;user-hover&quot; rel=&quot;kevin.albertson&quot;&gt;kevin.albertson&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;thank you for the presented solution.&lt;/p&gt;</comment>
                            <comment id="2053463" author="kevin.albertson" created="Tue, 6 Nov 2018 18:07:42 +0000"  >&lt;p&gt;Hi Zolotov,&lt;/p&gt;

&lt;p&gt;I was able to reproduce this on VS 2017. As the error message indicates, there is code in the C++ driver trying to create a &lt;tt&gt;std::aligned_storage&lt;/tt&gt; with alignment greater than &lt;tt&gt;alignof(max_align_t)&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;I&apos;m still investigating the right solution. As a workaround, you do one of the following:&lt;br/&gt;
1. Reconfigure, compile, and install the C driver without extra alignment. The root of this issue is that the &lt;tt&gt;bson_t&lt;/tt&gt; type in the C driver has 128 byte alignment by default. We&apos;d like to change it but can&apos;t without breaking ABI compatibility. See &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-2813&quot; title=&quot;Remove BSON_EXTRA_ALIGNMENT option&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-2813&quot;&gt;CDRIVER-2813&lt;/a&gt;.&lt;br/&gt;
You can disable this extra alignment by configuring libmongoc with passing -DENABLE_EXTRA_ALIGNMENT=OFF to cmake:&lt;/p&gt;

&lt;p&gt;2. Define _ENABLE_EXTENDED_ALIGNED_STORAGE in the preprocessor Visual Studio project configuration.&lt;/p&gt;</comment>
                            <comment id="2048209" author="jesse" created="Wed, 31 Oct 2018 21:22:01 +0000"  >&lt;p&gt;Thanks for the report! We aren&apos;t currently testing with Visual Studio 2017, let us know if you find a solution.&lt;/p&gt;</comment>
                            <comment id="2045904" author="azriel" created="Tue, 30 Oct 2018 08:27:37 +0000"  >&lt;p&gt;I made a mistake in &apos;&lt;b&gt;Environment&lt;/b&gt;&apos;.&#160;&lt;/p&gt;

&lt;p&gt;Correct description is &apos;&lt;em&gt;Microsoft Visual Studio 2017 v15.8+&lt;/em&gt;&apos;.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="598755">CDRIVER-2813</issuekey>
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            <issuekey id="638246">CXX-1697</issuekey>
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