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<a href="https://gitlab.rtems.org/TheSamPrice">Sam Price</a> created a merge request: <a href="https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/55">!55</a>
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Project:Branches: TheSamPrice/rtems-lwip:netstart-extern-c to rtems/pkg/rtems-lwip:main
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Author: Sam Price
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<h2 id="user-content-summary" dir="auto" style="margin-top: 0px; margin-bottom: 10px;" align="initial">Summary<a href="#summary" aria-label="Link to heading 'Summary'" data-heading-content="Summary" class="anchor" style="margin-top: 0px;"></a>
</h2>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">netstart.h: Add the extern "C" guard</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">The header declares start_networking() and start_networking_shared() with no
guard, so a C++ caller gets C++-mangled references that nothing defines:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style="display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;"><code style="font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;"><span id="LC1" class="line" data-lang="plaintext" style="margin-top: 0px;">undefined reference to `start_networking(netif*, ip_addr*, ip_addr*,</span>
<span id="LC2" class="line" data-lang="plaintext"> ip_addr*, unsigned char*)'</span></code></pre>
<copy-code></copy-code><insert-code-snippet></insert-code-snippet>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">It compiles, and fails at link with a message that names a function the caller
can plainly see is there -- which sends the reader looking for a missing
library rather than a missing guard.</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">netstart.h is the public entry point to this library: bringing the interface up
is the first thing any application does with it, and an application in C++ is
not unusual.</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">Several other headers under rtemslwip/include are also unguarded --
sys/sysctl.h, xil-compat-lwip-common.h, arch/sys_arch.h among them. They are
left alone here because they are internal to the build and because one header
is a reviewable change; the same argument applies to them if anyone reaches
them from C++.</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">Signed-off-by: Samuel Price <a href="mailto:thesamprice@gmail.com" style="margin-top: 0px;">thesamprice@gmail.com</a>
Assisted-by: Claude Opus 5 (1M context) <a href="mailto:noreply@anthropic.com">noreply@anthropic.com</a></p>
<h2 id="user-content-generative-ai" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Generative AI<a href="#generative-ai" aria-label="Link to heading 'Generative AI'" data-heading-content="Generative AI" class="anchor" style="margin-top: 0px;"></a>
</h2>
<p dir="auto" style="color: #3a383f; margin: 0px;" align="initial">Assisted-by: Claude Opus 5 (1M context) <a href="mailto:noreply@anthropic.com" style="margin-top: 0px;">noreply@anthropic.com</a></p>
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