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<div class="moz-cite-prefix">On 11/03/2014 09:51 AM, Eli Bendersky
wrote:<br>
</div>
<blockquote
cite="mid:CACLQwhG1fU3jMdG-sjbojV_Djt7UB7-h7iZ0Tu95XrCndFXdjg@mail.gmail.com"
type="cite">
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<div class="gmail_quote">On Mon, Nov 3, 2014 at 9:26 AM, Tom
Stellard <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:tom@stellard.net" target="_blank">tom@stellard.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><span
class="">On Fri, Oct 31, 2014 at 04:31:47PM -0700, Bob
Wilson wrote:<br>
><br>
> > On Oct 31, 2014, at 4:19 PM, Eric Christopher
<<a moz-do-not-send="true"
href="mailto:echristo@gmail.com">echristo@gmail.com</a>>
wrote:<br>
> ><br>
> ><br>
> ><br>
</span><span class="">> > On Fri Oct 31 2014 at
3:11:22 PM Tom Stellard <<a moz-do-not-send="true"
href="mailto:tom@stellard.net">tom@stellard.net</a>
<mailto:<a moz-do-not-send="true"
href="mailto:tom@stellard.net">tom@stellard.net</a>>>
wrote:<br>
> > Hi,<br>
> ><br>
> > I would like to propose deprecating the
autoconf build system at some<br>
> > point in the future. Maintaining two build
systems is a hassle not<br>
> > only for this project, but also for other
projects that use LLVM<br>
> > and have to deal with the slight differences
in output between the two<br>
> > build systems.<br>
> ><br>
> > It seems like most people are using CMake at
this point, so my questions<br>
> > to the community are:<br>
> ><br>
> > - Is there any technical reason why the
remaining autoconf users can't switch<br>
> > to CMake?<br>
> ><br>
> ><br>
> > I think Bob was the lead on keeping the
autoconf system last year when this came up, there is a
PR somewhere in the system about the blocking things
that need to work in cmake to get it to happen. I don't
know where we are on that list or what features people
still need.<br>
><br>
> I’ve come around to the point of accepting the
inevitability of moving to cmake, but I think there’s
quite a bit of work to be done to get everything to
work. The compiler-rt build in particular is
problematic.<br>
><br>
> ><br>
> > Personally I still use the autoconf system,
but am willing to remove it if we can get to a single
system, but all of the requirements need to be handled
first.<br>
> ><br>
> > -eric<br>
> ><br>
> > For example, I personally use automake, and
the only reason I don't<br>
> > use CMake is because it doesn't produce a
single shared object<br>
</span>> > (e.g. <a moz-do-not-send="true"
href="http://libLLVM-3.6.0svn.so" target="_blank">libLLVM-3.6.0svn.so</a>
<<a moz-do-not-send="true"
href="http://libllvm-3.6.0svn.so/" target="_blank">http://libllvm-3.6.0svn.so/</a>>).<br>
<span class="">> ><br>
> > - What is a reasonable timeframe to allow the
remaining autoconf users<br>
> > a chance to migrate to CMake?<br>
><br>
> I don’t know how to answer that. Someone will need
to do the work to first identify all the problems and
then to get them fixed.<br>
><br>
> Converting everything to cmake will take quite a
lot of work. In comparison, the minor hassle of keeping
the makefiles working for a bit longer seems pretty
insignificant.<br>
<br>
</span>The main problem is testing. It doubles the
testing load to have two<br>
build systems, because we need to make sure both build
systems work<br>
on all platforms.<br>
<br>
</blockquote>
<div><br>
</div>
<div>+1 to this. </div>
<div><br>
</div>
<div>The situation I frequently find myself in is - doing
development using CMake + ninja, and then when I need to
actually commit to SVN, I need to build & test with
the makefile as well because the builds are slightly
different, of occasionally make builds fail where CMake +
ninja suceeds. And rebuilding all of LLVM + Clang with the
makefile build is *slow*, even on a fast machine.</div>
<div><br>
</div>
<div>Eli</div>
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<br>
</blockquote>
<br>
This is extra burdensome because LLVM requires an ancient version of
autotools. You need to track down the old versions and install them
to regenerate the makefiles, which is a lot of unnecessary work.<br>
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