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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-48427] Fix useless compiler tools checks</title>
                <link>https://jira.mongodb.org/browse/SERVER-48427</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In both &lt;tt&gt;etc/scons/mongodbtoolchain_v3_gcc.vars&lt;/tt&gt; and &lt;tt&gt;etc/scons/mongodbtoolchain_v3_clang.vars&lt;/tt&gt;, we test that the toolchain is complete using the following:&lt;/p&gt;
&lt;p/&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;AR &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;=&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; subprocess.check_output([CXX, &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;-print-prog-name=ar&apos;&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;]).decode(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;utf-8&apos;&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;).strip()&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;AS &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;=&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; subprocess.check_output([CXX, &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;-print-prog-name=as&apos;&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;]).decode(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;utf-8&apos;&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;).strip()&lt;/span&gt;&lt;/pre&gt;
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					&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;OBJCOPY &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;=&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; subprocess.check_output([CXX, &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;-print-prog-name=objcopy&apos;&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;]).decode(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;utf-8&apos;&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;).strip()&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;Ostensibly, this check makes sure the compiler toolchain is valid. However, there are two problems with this approach:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;We already do it when we test compile simple programs, so it&apos;s not really needed.&lt;/li&gt;
	&lt;li&gt;It&apos;s not actually a valid test because:
	&lt;ol&gt;
		&lt;li&gt;We&apos;re using piped builds and the toolchains determine what to execute at build time.&lt;/li&gt;
		&lt;li&gt;We never set these variables in the environment to ensure what we tested is what we actually use during build.&lt;/li&gt;
		&lt;li&gt;It&apos;s possible to override the tool that gets used regardless of what we test.&lt;/li&gt;
	&lt;/ol&gt;
	&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;As they exist now, these tests are confusing because they declare something that isn&apos;t actually true. In especially the case of clang, it will use &lt;tt&gt;llvm-as&lt;/tt&gt; on systems that support it, and we only ever test &lt;tt&gt;as&lt;/tt&gt;. We should either remove the tests entirely or, if we still need them for some reason, update them to be accurate with respect to the actual build that will occur.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1363029">SERVER-48427</key>
            <summary>Fix useless compiler tools checks</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="backlog-server-devplatform">[DO NOT ASSIGN] Backlog - Server Development Platform Team (SDP)</assignee>
                                    <reporter username="ryan.egesdahl@mongodb.com">Ryan Egesdahl</reporter>
                        <labels>
                    </labels>
                <created>Tue, 26 May 2020 23:17:06 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:49 +0000</updated>
                            <resolved>Mon, 13 Dec 2021 16:33:45 +0000</resolved>
                                    <version>4.5 Desired</version>
                                                    <component>Build</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4244347" author="april.schoffer" created="Mon, 13 Dec 2021 16:33:45 +0000"  >&lt;p&gt;Discussed during planning - this is no longer relevant.&lt;/p&gt;</comment>
                            <comment id="3121342" author="ryan.egesdahl" created="Wed, 27 May 2020 15:17:35 +0000"  >&lt;p&gt;I didn&apos;t realize that these variables were being used elsewhere, but that does make sense, thanks. I think this works just fine for gcc based on what you&apos;re saying, but I don&apos;t think it works for llvm because we can end up in a situation where we&apos;re using two different linkers or assemblers in the same build. Is there a way we can pass tool names down to this script so we&apos;re just asking the compiler to resolve the tool path for us? I am not sure what a good practice here would be.&lt;/p&gt;</comment>
                            <comment id="3119952" author="acm" created="Wed, 27 May 2020 13:48:36 +0000"  >&lt;p&gt;These aren&apos;t really validity checks though. We are asking the toolchain to tell us what it would use if it wanted to invoke the assembler or archiver, so that we can tell SCons where those tools are. There are (a few) situations where we manually invoke the assembler, so we need to know where the compiler&apos;s version of `as` is, and there are lots of circumstances where we directly invoke the archiver. Ditto &lt;tt&gt;objcopy&lt;/tt&gt;. I agree that setting these doesn&apos;t change what the compiler will use. Note though that this file also sets the toolchain bin directory into the PATH. This is more of a safety net than a hard requirement: the toolchain should already know the sysroot by which to find its own builds of the linker and assembler (should it need one). &lt;/p&gt;</comment>
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