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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>[CDRIVER-1387] BSON_EXTRA_ALIGN 0 does not compile with MSVC</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-1387</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;If BSON_EXTRA_ALIGN is 0 the BSON_ALIGNED_BEGIN macro defined &lt;a href=&quot;https://github.com/mongodb/libbson/blob/33851d13ff3a392/src/bson/bson-macros.h#L127&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; is invalid.&lt;/p&gt;

&lt;p&gt;MSVC does not allow mathematical expressions in align:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;__declspec( align( # ) ) declarator&lt;/p&gt;

&lt;p&gt;...&lt;/p&gt;

&lt;p&gt;&amp;#35; is the alignment value. &lt;b&gt;Valid entries are integer powers of two from 1 to 8192 (bytes), such as 2, 4, 8, 16, 32, or 64.&lt;/b&gt;&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;&lt;a href=&quot;https://msdn.microsoft.com/en-us/library/83ythb65.aspx&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://msdn.microsoft.com/en-us/library/83ythb65.aspx&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The cmake file always sets BSON_EXTRA_ALIGN to 1 so this was never noticed. &lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/libbson/blob/33851d13/CMakeLists.txt#L70-L92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/libbson/blob/33851d13/CMakeLists.txt#L70-L92&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="301553">CDRIVER-1387</key>
            <summary>BSON_EXTRA_ALIGN 0 does not compile with MSVC</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="9">Done</resolution>
                                        <assignee username="shane.harvey@mongodb.com">Shane Harvey</assignee>
                                    <reporter username="shane.harvey@mongodb.com">Shane Harvey</reporter>
                        <labels>
                    </labels>
                <created>Fri, 15 Jul 2016 20:24:24 +0000</created>
                <updated>Wed, 10 Aug 2016 22:10:46 +0000</updated>
                            <resolved>Mon, 18 Jul 2016 17:40:05 +0000</resolved>
                                                    <fixVersion>1.4.0</fixVersion>
                                    <component>libbson</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1327228" author="xgen-internal-githook" created="Mon, 18 Jul 2016 17:17:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ajdavis&apos;, u&apos;name&apos;: u&apos;A. Jesse Jiryu Davis&apos;, u&apos;email&apos;: u&apos;jesse@emptysquare.net&apos;}
&lt;p&gt;Message: Merge pull request #170 from ShaneHarvey/master&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-1387&quot; title=&quot;BSON_EXTRA_ALIGN 0 does not compile with MSVC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-1387&quot;&gt;&lt;del&gt;CDRIVER-1387&lt;/del&gt;&lt;/a&gt; Fix MSVC syntax error in align&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/libbson/commit/6d0e8b2edc8f5c62740bd0795f6434f7ea8e079d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/libbson/commit/6d0e8b2edc8f5c62740bd0795f6434f7ea8e079d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1327226" author="xgen-internal-githook" created="Mon, 18 Jul 2016 17:17:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ShaneHarvey&apos;, u&apos;name&apos;: u&apos;Shane Harvey&apos;, u&apos;email&apos;: u&apos;shane.harvey@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-1387&quot; title=&quot;BSON_EXTRA_ALIGN 0 does not compile with MSVC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-1387&quot;&gt;&lt;del&gt;CDRIVER-1387&lt;/del&gt;&lt;/a&gt; Fix MSVC syntax error in align&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/libbson/commit/46b7549de61559d76b437a59a2014d6dc5026012&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/libbson/commit/46b7549de61559d76b437a59a2014d6dc5026012&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1325836" author="shane.harvey" created="Fri, 15 Jul 2016 20:27:50 +0000"  >&lt;p&gt;It&apos;s not even possible to do align((8)) because of the extra parentheses. So&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: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// syntax error&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;define BSON_ALIGNED_BEGIN(_N) &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;__declspec&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; (align ((_N) &amp;gt; BSON_ALIGN_OF_PTR ? BSON_ALIGN_OF_PTR : (_N) ))&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: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// syntax error&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;define BSON_ALIGNED_BEGIN(_N) &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;__declspec&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; (align ((_N)))&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: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// correct&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;define BSON_ALIGNED_BEGIN(_N) &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;__declspec&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; (align (_N))&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>
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