[Interest] Slow compiling on Mac

[Bo Elmgreen]

Hi again,

Hmmm - using jN+1 does not improve things, but ... why would it?

Cheers,
Bo

On Thu, Aug 30, 2012 at 1:32 PM, Bo Elmgreen <bo.elmgreen at gmail.com> wrote:

> Hi Mike,
>
> That certainly hit the spot! With that switch the compile time with gcc is
> down to 8 minutes.
>
> Thanks!
> Bo
>
>
> On Thu, Aug 30, 2012 at 1:17 PM, Michael Jackson <imikejackson at gmail.com>wrote:
>
>> In QtCreator it uses "Make" to do the compile and by default it will only
>> use a single thread Where Xcode would by default use all your cores to
>> compile. You need to add a "-jN" to the "make argument" in the "Project"
>> tab of QtCreator. Where "N" is the number of cores on your computer. That
>> will speed things up.
>>
>> Mike,
>>
>> On Aug 30, 2012, at 7:09 AM, Bo Elmgreen wrote:
>>
>> > Hi!
>> >
>> > Thanks for the suggestions. Yes, it is true that I might be comparing
>> apples to pears :-) but what if gcc actually was just as fast as clang? ;-)
>> > Anyway, I am now trying to set up clang in QtCreator. Since 4.8.0 (I
>> think) there are mkspecs for clang - although unsupported - but when
>> compiling, QtCreator cannot find clang++ :-/ And I cannot find it on my
>> system. Maybe it is because I still have Xcode 3.2.6 installed!? Hmmm - it
>> seems like I need to upgrade to Xcode 4 in order to get clang++ :-/
>> >
>> > Cheers,
>> > Bo
>> >
>> > On Thu, Aug 30, 2012 at 12:48 PM, Konstantin Tokarev <annulen at yandex.ru>
>> wrote:
>> >
>> >
>> > 30.08.2012, 14:37, "Till Oliver Knoll" <till.oliver.knoll at gmail.com>:
>> > > Am 30.08.2012 um 11:47 schrieb Bo Elmgreen <bo.elmgreen at gmail.com>:
>> > >
>> > >>  ...(gcc in QtCreator and clang in Xcode)
>> > >
>> > > Here you go, you answered your own question! :)
>> > >
>> > > You were not comparing Qt Creator vs Xcode, but rather gcc vs clang!
>> > >
>> > >>  ... are there tricks we can use to speed up the compiling?
>> > >
>> > > Usually the environment variable QMAKESPEC tells 'qmake' how to
>> generate the Makefiles (for what compiler).
>> >
>> > There's no clang mkspec in Qt 4.7, so QMAKE_CXX needs to be specified
>> on qmake command line.
>> >
>> > --
>> > Regards,
>> > Konstantin
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