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<a href="https://gitlab.rtems.org/joel">Joel Sherrill</a>
<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/3644#note_110436">commented</a>:
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">This is in newlib and has been since 2002. It is likely that the code written that didn't see it did not define the proper feature flag to trip this in stdlib.h:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; 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: 0; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">#if __POSIX_VISIBLE >= 200809</span>
<span id="LC2" class="line" lang="plaintext">extern char *suboptarg; /* getsubopt(3) external variable */</span>
<span id="LC3" class="line" lang="plaintext">int getsubopt (char **, char * const *, char **);</span>
<span id="LC4" class="line" lang="plaintext">#endif</span></code></pre>
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<p dir="auto" style="color: #333238; margin: 0;" align="initial">RTEMS does not have a <strong style="font-weight: 600; margin-top: 0;">TEST</strong> for this and would appreciate 1+.</p>
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<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/3644#note_110436">View it on GitLab</a>.
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