[cfe-dev] [llvm-dev] Fwd: Raising CMake minimum version to 3.4.3

Chris Bieneman via cfe-dev cfe-dev at lists.llvm.org
Wed Apr 27 12:26:09 PDT 2016

> On Apr 27, 2016, at 12:13 PM, Chuck Atkins <chuck.atkins at kitware.com> wrote:
> The problem I see with doing this in the current situation is that it isn’t just the CMake module we need. If you look at the changes I called out in my earlier email, there are associated CMake C++ source changes too.
> I also think that one of the limitations I frequently come up against with CMake 2.8.12, is that newer CMake versions accept generator expressions in more places. This is entirely implemented in the CMake C++ code, and there is no way to workaround it in CMake scripts other than not using generator expressions.
> Indeed that doesn't work for all situations. The extensive advancement of generator expressions is a huge leap from older CMake versions given that they had just started to really appear near the end of 2.8.  You can't work around that effectively by just using a few newer CMake modules.  It will, however, give you a way to keep up to date with the frequently changing ExternalProject module once updating the minimum version.

Absolutely. In the future if there are changes to ExternalProject that are only in the CMake module we can have a copy in the LLVM repository to provide that compatibility.

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