<div dir="auto">Examples of tier 2 breaking 1 are when a change in its code need & warrant a change in common apis (in tier 1), and those changes break unrelated tier 1 code.<div dir="auto"><br></div><div dir="auto">I agree it's not super well defined, but I really think we shouldn't try to list what is in/out of each tier and I'm hoping people can help me define the scope of each.</div><div dir="auto"><br></div><div dir="auto">Questions like yours are super helpful to do just that. </div><div dir="auto"><br></div><div dir="auto">Thanks! </div><div dir="auto">Renato </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, 31 Oct 2020, 02:21 Neil Nelson via llvm-dev, <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<p><font size="-1">Renato,</font></p>
<p><font size="-1">By your earlier requirements for tier 1, not
seeing how tier 2 could break tier 1. If a file was in tier 2,
it would not be in tier 1. There would be no action in tier 1 on
tier 2 files to cause a break.</font></p>
<p><font size="-1">What this may mean is that those working in tier
2 do not wander into tier 1, obscuring that distinction. Or that
there may be some confusion about what was in tier 1 vs. 2. That
in some manner the distinction becomes not well defined.<br>
</font></p>
<p><font size="-1">Neil Nelson<br>
</font></p>
<div><font size="-1">On 10/30/20 6:13 PM,
Renato Golin via llvm-dev wrote:<br>
</font></div>
<blockquote type="cite"><font size="-1">But I wanted to express: "3 can't break 2 can't break
1", and make it easier to drop silly scripts or config files if
they're no longer valid or maintained, more easily than dropping
entire build systems.</font></blockquote>
</div>
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