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

[Taylor Braun-Jones]

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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