[vtk-developers] Plan to make CMake 3.3 and C++11 required

[David Gobbi]

Almost exactly three years after I upgraded the wrappers to read C++11
syntax :)


On Wed, Jan 4, 2017 at 12:36 PM, Mathieu Westphal <
mathieu.westphal at kitware.com> wrote:

> That's awesome ! Thanks for doing that !
>
>
>
> Mathieu Westphal
>
> On Wed, Jan 4, 2017 at 8:06 PM, Robert Maynard <robert.maynard at kitware.com
> > wrote:
>
>> As we start a new year, it is time to announce that we are planning on
>> rolling out a series of updates to VTK that are starting with the update
>> of the minimum required CMake version.
>>
>> We have chosen CMake 3.3 as the minimum required version for numerous
>> reasons,
>> the most important of those reasons being:
>>
>> - It is the first CMake release that offers C++11 support for all four
>> major
>>   compilers ( GCC / MSVC / Clang / XCode ). [1]
>>
>> - The CMake version is sufficiently new enough that it allows for a
>> cleaning
>>   of the existing CMake infrastructure. The current CMake minimum version
>>   requires VTK to maintain forks of numerous FindPackages and Modules
>> that are
>>   part of newer CMake versions.
>>
>> - Supports HTTPS downloads, with all the official binaries come with
>> support.
>>   Allowing for migration of external data to a HTTPS only server.
>> Something we
>>   are going to require in the near future. [2]
>>
>> As mentioned above this year we have a series of upgrades planned to VTK
>> which
>> require moving the minimum CMake version to 3.3. The most significant
>> of these changes to all developers is the requirement of a C++11 capable
>> compiler.
>>
>> Yes you heard that correct, VTK is going to soon require a C++11 capable
>> compiler. To be more exact we are going to require a compiler that
>> understands
>> the significant majority of the C++11 language and runtime additions. The
>> exact
>> versions for each compiler have not been set in stone, but a rough
>> estimation
>> would be:
>>   - GCC 4.8+
>>   - Clang 3.3+
>>   - XCode 5.0+
>>   - MSVC 2013+
>> As we progress through the year, I expect a more concrete list of
>> supported
>> compilers will be determined and documented.
>>
>> Now the roll out for C++11 support is going to happen in multiple stages
>> with an initial plan being:
>>
>> Stage 1: We require CMake 3.3, upgrade all dashboards, work through
>> developer
>>          reported issues with the version bump
>>
>> Stage 2: Explicitly enable C++11 compiler flags during CMake
>> configuration. Again
>>          we will have to upgrade/retire dashboards, work through developer
>>          reported issues.
>>
>> Stage 3: Update the VTK Coding Standards for C++11.
>>
>> Stage 4: Allow C++11 to be used in VTK ( outside currently permitted
>> usage ).
>>
>> Notes:
>>
>> 1 - If you are using a different compiler vendor than one of those listed
>> above
>>     please see if it is currently supported
>>     ( https://cmake.org/cmake/help/v3.7/manual/cmake-compile-featu
>> res.7.html ).
>>     If the vendor is not explicitly listed please contact me, so we can
>> discuss
>>     what options are available.
>>
>> 2 - https://data.kitware.com is transitioning to be the location for all
>>     external data, and requires a SSL connection.
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>>
>
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