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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-59503] Regenerate files with ninja when MONGO_VERSION changes</title>
                <link>https://jira.mongodb.org/browse/SERVER-59503</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If we update MONGO_VERSION and attempt to rebuild using ninja, auto-generated files that use MONGO_VERSION will not automatically regenerate. Sample repro:&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;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;$ git checkout r5.0.2~1&lt;/span&gt;&lt;/pre&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;$ scons ... --ninja generate-ninja&lt;/span&gt;&lt;/pre&gt;
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		&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;$ ninja build/.../mongo/util/version_constants.h&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;$ git checkout r5.0.2&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;$ ninja build/.../mongo/util/version_constants.h&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The second build should not return &quot;&lt;tt&gt;ninja: no work to do&lt;/tt&gt;&quot;&lt;/p&gt;

&lt;p&gt;The files are regenerated correctly when using plain SCons.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1858030">SERVER-59503</key>
            <summary>Regenerate files with ninja when MONGO_VERSION changes</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13202">Works as Designed</resolution>
                                        <assignee username="ryan.egesdahl@mongodb.com">Ryan Egesdahl</assignee>
                                    <reporter username="xuerui.fa@mongodb.com">Xuerui Fa</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Aug 2021 14:55:19 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:17 +0000</updated>
                            <resolved>Thu, 26 Aug 2021 03:44:30 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4023189" author="ryan.egesdahl" created="Thu, 26 Aug 2021 03:44:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=xuerui.fa&quot; class=&quot;user-hover&quot; rel=&quot;xuerui.fa&quot;&gt;xuerui.fa&lt;/a&gt; The behavior you&apos;re seeing isn&apos;t directly related to &lt;tt&gt;MONGO_VERSION&lt;/tt&gt; except that &lt;tt&gt;version_constants.h&lt;/tt&gt; is generated from it, which actually part of the &lt;tt&gt;generated-sources&lt;/tt&gt; target. The &lt;tt&gt;generated-sources&lt;/tt&gt; target has no declared dependency on the value of &lt;tt&gt;MONGO_VERSION&lt;/tt&gt; - nor can we easily make SCons aware of such a dependency, in fact, which means we also can&apos;t represent it in &lt;tt&gt;build.ninja&lt;/tt&gt;, either.&lt;/p&gt;

&lt;p&gt;What you&apos;re really asking for here is for Ninja to be aware of changes to the state of your worktree. Ninja is a tool that depends on a snapshot of the current state of the worktree in order to optimize the task. The only way we could make it aware of changes to the state of your worktree is to have it always run SCons to generate a new snapshot, which would be slow enough that it defeats the reason you probably wanted to use Ninja in the first place.&lt;/p&gt;

&lt;p&gt;Unfortunately, this is just a limitation of Ninja. Whenever you change branches or do a &lt;tt&gt;git pull&lt;/tt&gt; or do anything else that changes your worktree in a way that Ninja can&apos;t be aware of (anything operated on by the &lt;tt&gt;generated-sources&lt;/tt&gt; target is a likely candidate), you will need to generate your &lt;tt&gt;build.ninja&lt;/tt&gt; over again.&lt;/p&gt;</comment>
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