<p>Really strange. What I could figure out is that the problem arose 3 days ago by merging PR <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="371520670" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/10195" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/10195/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/10195">#10195</a>, which apparently has nothing to do with ESP-NOW.</p>
<p>When you checkout commit <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/RIOT-OS/RIOT/commit/95a2081cfa61fd829d740d1346c41454380b42e1/hovercard" href="https://github.com/RIOT-OS/RIOT/commit/95a2081cfa61fd829d740d1346c41454380b42e1"><tt>95a2081</tt></a> it works as exepected.<br>
But, when you checkout commit <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/RIOT-OS/RIOT/commit/65b71026088f5c2ef7b99fab1e00ca5779f83127/hovercard" href="https://github.com/RIOT-OS/RIOT/commit/65b71026088f5c2ef7b99fab1e00ca5779f83127"><tt>65b7102</tt></a>, the problem occurs.</p>
<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=1301112" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/benpicco">@benpicco</a> Would you have some time to check whether the changes of compile options of PR <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="371520670" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/10195" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/10195/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/10195">#10195</a> affect the compilation of ESP32 code? Maybe it is just a side effect and the real problem is something else. You could use</p>
<pre><code>USEMODULE=esp_now make BOARD=esp32-wroom-32 -C examples/gnrc_networking flash
</code></pre>
<p>which produces the same problem but makes the test easier since it doesn't require the fix in PR <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="494745568" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/12263" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/12263/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/12263">#12263</a>.</p>
<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=3057851" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/jcarrano">@jcarrano</a> Might changed compile options produce problems on certain architectures?</p>

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