<p><b>@jcarrano</b> requested changes on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/12198#discussion_r323157927">makefiles/cflags.inc.mk</a>:</p>
<pre style='color:#555'>> @@ -39,9 +39,10 @@ endif
 CFLAGS += -fno-common
 
 # Compress debug info. This saves approximately 50% of disk usage.
-# It has no effect if debugging information is not emitted, so it can be left
-# on unconditionally.
-OPTIONAL_CFLAGS += -gz
+# This makes ccache less effective, so disable for CI builds.
+ifneq (1, $(RIOT_CI_BUILD))
</pre>
<p>I second <a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=675644" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/miri64">@miri64</a> , the test should not be for RIOT_CI_BUILD. The current meaning of RIOT_CI_BUILD is "turn off any non-determinism". I may want to build with both RIOT_CI_BUILD and debug. Also, the issue may not manifest itself if the path is not changed, which means even testing for CCACHE is too much.</p>
<p>This should be done in a way that is specific to murdock and nothing else.</p>

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