[cmake-developers] RFC: CMake precompiled header support and custom compiler based implementation

[Daniel Pfeifer]

My working branch is here: https://github.com/purpleKarrot/CMake/commits/pch

Feel free to comment, evaluate, contribute.

I am nut fully decided regarding these two questions:
- Do we want to support different pch per CONFIG? I think no, but I
might be wrong.
- Do we want to support different pch per LANGUAGE? I first thought
yes, but I am no longer certain about that.

On Fri, Dec 4, 2015 at 5:12 AM, Taylor Braun-Jones
<taylor at braun-jones.org> wrote:
> Perhaps the Paris Climate talks would be good inspiration for tackling
> this feature. How many pounds of CO2 are emitted each year due to
> needless header compilation CPU cycles? :-)
>
> On Fri, Oct 30, 2015 at 1:48 AM, James Johnston
> <johnstonj.public at codenest.com> wrote:
>>> -----Original Message-----
>>
>>> From: cmake-developers [mailto:cmake-developers-bounces at cmake.org]
>>
>>> On Behalf Of Daniel Pfeifer
>>
>>> Sent: Wednesday, October 28, 2015 08:57
>>
>>> To: Taylor Braun-Jones
>>
>>> Cc: CMake Developers
>>
>>> Subject: Re: [cmake-developers] RFC: CMake precompiled header support
>>
>>> and custom compiler based implementation
>>
>>>
>>
>>> On Tue, Oct 27, 2015 at 3:53 AM, Taylor Braun-Jones <taylor at braun-
>>
>>> jones.org> wrote:
>>
>>> > What's the status of this PCH feature? Does it need testers? More
>>
>>> > design input? I'd love to see this feature in a future CMake release.
>>
>>> > Willing to help.
>>
>>>
>>
>>> I haven't worked on it for quite some time as I currently don't have a
>>
>> project
>>
>>> which needs it.
>>
>>> But I agree that we should get it into CMake, even if it does not
>>
>>> support
>>
>> all
>>
>>> generators yet.
>>
>>> Support for additional generators can be added successively.
>>
>>>
>>
>>> I will rebase my branch to master on the weekend, ie port it to
>>
>>> cmGeneratorTarget.
>>
>>> Then you are free to help with review, testing, and additional generators.
>>
>>>
>>
>>> Which generators are the most important for you?
>>
>>
>>
>> I'd also love to see some progress on PCH support, though I haven't had much
>> time recently... I'd be quite happy to test however with the below compilers
>> and generators - all of which we would use PCH support with:
>>
>>
>>
>> Generators:
>>
>>
>>
>> * Ninja
>>
>> * Visual Studio 2008 (eventually 2015)
>>
>> * Although we're not currently using it, CMake would be pretty broken
>> without supporting: Unix Makefiles
>>
>>
>>
>> Compilers:
>>
>>
>>
>> * Visual C++ 2008 (eventually 2015): both Ninja and VS generators
>>
>> * Embarcadero bcc32 compiler: Ninja
>>
>> * GCC: Ninja
>>
>>
>>
>> Best regards,
>>
>>
>>
>> James Johnston
>>
>>
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