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

[Robert Maynard]

:)

On Wed, Jan 4, 2017 at 3:48 PM, David Gobbi <david.gobbi at gmail.com> wrote:
> 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-features.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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>>
>