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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-81425] Automatically detect C files in bazel toolchain</title>
                <link>https://jira.mongodb.org/browse/SERVER-81425</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With the current toolchain *.c files are being compiled with g+&lt;ins&gt;/clang&lt;/ins&gt;+ which define the macro `__cplusplus`. This is incorrect and breaks the ability to properly compile a large number of C targets.&lt;/p&gt;

&lt;p&gt;Modify the toolchain to detect .c files and instead compile them with gcc/clang.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2450680">SERVER-81425</key>
            <summary>Automatically detect C files in bazel toolchain</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="13201">Fixed</resolution>
                                        <assignee username="zack.winter@mongodb.com">Zack Winter</assignee>
                                    <reporter username="zack.winter@mongodb.com">Zack Winter</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Sep 2023 19:05:45 +0000</created>
                <updated>Mon, 18 Dec 2023 17:44:14 +0000</updated>
                            <resolved>Wed, 8 Nov 2023 21:49:46 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5862721" author="xgen-internal-githook" created="Wed, 8 Nov 2023 00:27:15 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Zack Winter&apos;, &apos;email&apos;: &apos;zack.winter@mongodb.com&apos;, &apos;username&apos;: &apos;zackwintermdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81425&quot; title=&quot;Automatically detect C files in bazel toolchain&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81425&quot;&gt;&lt;del&gt;SERVER-81425&lt;/del&gt;&lt;/a&gt; remove separate target for tcmalloc c targets&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9b1e87713ccb72ac49b351f75a6e5f190dfafbf7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9b1e87713ccb72ac49b351f75a6e5f190dfafbf7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5859163" author="xgen-internal-githook" created="Mon, 6 Nov 2023 23:15:32 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Zack Winter&apos;, &apos;email&apos;: &apos;zack.winter@mongodb.com&apos;, &apos;username&apos;: &apos;zackwintermdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81425&quot; title=&quot;Automatically detect C files in bazel toolchain&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81425&quot;&gt;&lt;del&gt;SERVER-81425&lt;/del&gt;&lt;/a&gt; Automatically detect C files in bazel toolchain&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b75a05bcd7db73d50df4552582a06e9548537385&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b75a05bcd7db73d50df4552582a06e9548537385&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5792975" author="JIRAUSER1274619" created="Thu, 19 Oct 2023 22:55:41 +0000"  >&lt;p&gt;In master we&apos;re relying on a macro around the native `cc_library` right now so I don&apos;t think there&apos;s a way to select a toolchain based on the extension of each source code as-is: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/bazel/mongo_src_rules.bzl#L5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/bazel/mongo_src_rules.bzl#L5&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;If we switch to implementing our own version of `cc_library/program/etc` like in the POC we can select the toolchain based off of the extension.&lt;/p&gt;

&lt;p&gt;Do you think we won&apos;t be able to rely on the native versions of these to support all of the features we need? It would be great if we could rely on the built in bazel cc rules to do a lot of the manual work, but I&apos;m not sure how far defining our own toolchain config will get us.&lt;/p&gt;</comment>
                            <comment id="5792483" author="JIRAUSER1274619" created="Thu, 19 Oct 2023 20:36:22 +0000"  >&lt;p&gt;Notes from meeting with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.moody%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;daniel.moody@mongodb.com&quot;&gt;daniel.moody@mongodb.com&lt;/a&gt; - we will want to require this before flipping the switch on requiring bazel since there are subtle differences between gcc/clang &amp;amp; g+&lt;ins&gt;/clang&lt;/ins&gt;+&lt;/p&gt;

&lt;p&gt;We can do this either by:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Defining our own toolchain config implementation and switching between compiler depending on the bazel action (see &lt;a href=&quot;https://github.com/carbon-language/carbon-lang/blob/trunk/bazel/cc_toolchains/clang_cc_toolchain_config.bzl#L85)&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/carbon-language/carbon-lang/blob/trunk/bazel/cc_toolchains/clang_cc_toolchain_config.bzl#L85&lt;/a&gt; for example) This would allow interleaving C &amp;amp; C++ source in a single target&lt;/li&gt;
	&lt;li&gt;Creating a new set of toolchain configs for C &amp;amp; creating a set of C build macros that use those (ex. a &quot;mongo_c_library&quot; version of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/bazel/mongo_src_rules.bzl#L5)&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/bazel/mongo_src_rules.bzl#L5&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The second is a bit messy since it&apos;s yet another dimension of toolchain configs, which is already pretty huge (arch, OS, compiler), but it&apos;s a much simpler implementation.&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="2431465">SERVER-80603</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2486564">SERVER-82620</issuekey>
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