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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-70719] Create single-test unit test binaries for local development iteration</title>
                <link>https://jira.mongodb.org/browse/SERVER-70719</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When working on a single file it would be nice to iterate on just building that file rather than the whole file.&#160;&lt;/p&gt;

&lt;p&gt;Quoting &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jason.chan%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;jason.chan@mongodb.com&quot;&gt;jason.chan@mongodb.com&lt;/a&gt;&#160;&lt;/p&gt;

&lt;p&gt;Additionally, it&#8217;d be really nice to locally build a single test file. For example, I&#8217;d like to be able to generate an executable for producer_consumer_queue_test locally to minimize compile time when I&#8217;m working on that class. Today, we&#8217;d be able to do that but it&#8217;d involve defining a new CppUnitTest for every individual test file. I&#8217;m wondering if there&#8217;s something more clever that can be done with the CppUnitTest target to infer that a sub-target should be generated for each cpp file, and then keep it out of the evergreen build.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2162866">SERVER-70719</key>
            <summary>Create single-test unit test binaries for local development iteration</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jason.chan@mongodb.com">Jason Chan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Oct 2022 23:22:31 +0000</created>
                <updated>Mon, 18 Dec 2023 17:37:14 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4916651" author="JIRAUSER1268551" created="Thu, 20 Oct 2022 18:55:37 +0000"  >&lt;p&gt;That is true in some cases and not others. In the cases where all the parts needed are in the single cpp file and included libraries and headers we should allow building this single target.&lt;/p&gt;

&lt;p&gt;It would be interesting to figure that out automatically but a simple solution is to provide the targets with the caveat that not all of them build.&lt;/p&gt;</comment>
                            <comment id="4915471" author="acm" created="Thu, 20 Oct 2022 13:13:27 +0000"  >&lt;p&gt;The problem with this is that you can&apos;t actually guarantee that a given single TU from a &lt;tt&gt;CppUnitTest&lt;/tt&gt; can be meaningfully linked into an executable. For instance, if the unit test source file uses a helper class or fixture type that is implemented in another source file usually linked into the test program:&lt;/p&gt;

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

&lt;p&gt;While it is possibly meaningful to make a standalone binary for the tests from &lt;tt&gt;bar_test.cpp&lt;/tt&gt; by compiling just that file, it is probably impossible to do the same for &lt;tt&gt;foo_test.cpp&lt;/tt&gt; since it needs symbols defined in &lt;tt&gt;foo_test_helpers.cpp&lt;/tt&gt;. We would either need a way to annotate which files are/aren&apos;t buildable standalone (which is fragile and likely to become incorrect), or accept that requesting a single file unit test build may or may not work. I suppose we could also ban the above technique and require every C++ unit test TU to be standalone compilable, but we would need to show that the cost of having that restriction was outweighed by the advantages of having this single file build mode available to the developer population.&lt;/p&gt;

&lt;p&gt;Meanwhile, it is always possible to build any unit test binary on its own by building the target directly. Either by the filesystem path like &lt;tt&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;scons|ninja&amp;#93;&lt;/span&gt; ... build/install/bin/foo_test&lt;/tt&gt; or the shorthand &lt;tt&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;scons|ninja&amp;#93;&lt;/span&gt; ... +foo_test&lt;/tt&gt;. Once you have done this once, if you are iterating on &lt;tt&gt;foo_test.cpp&lt;/tt&gt; then you still only pay to compile that one TU and link the binary. Linking just the one TU isn&apos;t likely to be that much faster than linking all the unit test TUs anyway, especially in &lt;tt&gt;--link-model=dynamic&lt;/tt&gt; mode. And then on the execution side we already provide build rules to run just the tests from a given TU, so &lt;tt&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;scons|ninja&amp;#93;&lt;/span&gt; ... +foo_test.cpp&lt;/tt&gt; will run just the tests from &lt;tt&gt;foo_test.cpp&lt;/tt&gt;, after doing any necessary compilation and relinking.&lt;/p&gt;</comment>
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            <issuekey id="2136421">SERVER-69696</issuekey>
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