<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<p><font size="-1">Here
is how I would make the argument for the latest version of
cmake.</font></p>
<font size="-1">
</font>
<p><font size="-1">The latest version of cmake addresses a number
issues we face in
building LLVM including the following.</font></p>
<font size="-1">
</font>
<p><font size="-1">[list the justifications]</font></p>
<font size="-1">
</font>
<p><font size="-1">We realize this using of the latest versions of
external software
goes outside our usual method, but in this case the cmake
software
will not be folded into the resulting LLVM software release and
only
in the building of the release. Whatever issues a new cmake may
present in the build will be identified during testing in that
the
nature of cmake should easily allow our standard testing to know
if
it is working properly or not.</font></p>
<font size="-1">
</font>
<p><font size="-1">For those building </font><font size="-1"><font
size="-1">LLVM</font> for standard OS release versions such as
the Ubuntu LTS versions seen on our prepared build page, it is
expected that those installations are dedicated to the building
of
LLVM and not for any other production purpose so that installing
the
recent version of cmake will not affect their other efforts if
some
problem with this latest cmake version arises.</font></p>
<font size="-1">
</font>
<p><font size="-1">Neil Nelson</font>
<style type="text/css">p { margin-bottom: 0.1in; line-height: 115%; background: transparent none repeat scroll 0% 0%; }</style></p>
<div class="moz-cite-prefix"><font size="-1">On 11/4/19 7:33 AM,
Robinson, Paul wrote:</font><br>
</div>
<blockquote type="cite"
cite="mid:BYAPR13MB2421619149A5506B58655C21927F0@BYAPR13MB2421.namprd13.prod.outlook.com">
<pre class="moz-quote-pre" wrap="">However I think you are creating a false dichotomy. I have no real
insight into Ubuntu's methodology, but as a user, what I observe
is that Ubuntu LTS is NOT a collection of the most recent stable
well-tested versions of all components, kept up-to-date; instead,
it is a snapshot of stable, well-tested versions of all components,
which Ubuntu then commits to maintaining for N years. A given LTS
releases maintenance updates only, not new features.
And it is certainly not the case that every version of every
component after an Ubuntu LTS is a buggy, bleeding-edge untested
hacked-up mess. Ubuntu LTS chooses to stick with certain versions,
not because later versions are awful, but because picking up new
versions is not their goal.
So, when we talk about raising our minimum required CMake version,
it is not to take CMake bleeding-edge HEAD and have everyone build
their own; it is to take a more recent formal release of CMake.
Now, the CMake people might not conveniently package binaries for
everyone's environment, which might mean some people need to pull
a release's source package and build it themselves; this is the
nature of open-source.
--paulr
</pre>
</blockquote>
</body>
</html>