[CMake] CMake/Ninja support in Qt Creator

[Peter Kümmel]

On 24.09.2012 11:04, Nils Gladitz wrote:
> When I tried with one of my larger projects the first no-op build after
> a full build took something between 20 and 30 seconds but no-op builds
> after that were below a second.
>
> I'm not really sure what would cause this (I guess disk or filesystem
> caching?).

Yes, ninja needs to read a lot of files to check dependencies.

>
> Nils
>
> On 09/24/2012 10:42 AM, Peter Kümmel wrote:
>> On 23.09.2012 15:04, Wouter van Kleunen wrote:
>>>
>>> I had the following idea to speed up the building even more, if a tool
>>> can be build in ninja to list all files that need to be stat when
>>> building  a project. These files can be monitored by qtcreator and later
>>> be provided as input again to ninja. So my idea works as follows:
>>>
>>> 1. Build project using cmake + ninja
>>> 2. Get file list of all dependencies by using ninja (something like
>>> ninja -t deplist).
>>> 3. Monitor the files using qt creator + qfilesystemwatcher
>>>
>>> When the user requests a rebuild:
>>> 4. Execute a ninja build command + provide the list of changed files.
>>> This way ninja won't have to stat any file.
>>> 5. Ninja builds
>>>
>>> Is this feasible ?
>>
>> I assume Qt Creator does it this way for qbs.
>> But for ninja this would be too much work.
>>
>> You think even ninja is too slow?
>>
>> Peter
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>
>