That's because I'm an idiot and told you to use the wrong variable.
Try QMAKE_CXXFLAGS. :P

/s/ Adam

On Sun, Dec 20, 2009 at 11:46 AM, Paul Smith <phh...@gmail.com> wrote:
> Thanks again, Adam. I did as you suggested, but still getting -O2:
>
> -----------------------------------------------
> Running build steps for project exp...
> Configuration unchanged, skipping QMake step.
> Starting: /usr/bin/make -w
> make: Entering directory `/home/psmith/exp'
> g++ -c -pipe -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
> -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -Wall
> -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB
> -I/usr/lib64/qt4/mkspecs/linux-g++ -I. -I/usr/include/QtCore
> -I/usr/include/QtGui -I/usr/include -I. -o exp.o exp.cpp
> exp.cpp: In function 'int main()':
> exp.cpp:17: warning: unused variable 'ngen'
> g++ -O3 -Wl,-O1 -o exp exp.o -lQtGui -lQtCore -lpthread
> make: Leaving directory `/home/psmith/exp'
> Exited with code 0.
> -----------------------------------------------
>
> Paul
>
>
>
> On Sun, Dec 20, 2009 at 2:36 AM, Coda Highland <c...@bobandgeorge.com> wrote:
>> This is really a qmake question, since it's qmake that controls this.
>>
>> In your .pro file, use something like:
>> QMAKE_LFLAGS -= -O2
>> QMAKE_LFLAGS += -O3
>>
>> /s/ Adam
>>
>> On Sat, Dec 19, 2009 at 6:38 PM, Paul Smith <phh...@gmail.com> wrote:
>>> Thanks, Adam. I was thinking about the option -O3. How can one force
>>> qt-creator to use -O3?
>>>
>>> Paul
>>>
>>>
>>> On Sun, Dec 20, 2009 at 12:31 AM, Coda Highland <c...@bobandgeorge.com> 
>>> wrote:
>>>> On Linux, it uses -O2 by default in release mode if I recall
>>>> correctly, so it already is.
>>>>
>>>> /s/ Adam
>>>>
>>>> On Sat, Dec 19, 2009 at 5:46 PM, Paul Smith <phh...@gmail.com> wrote:
>>>>> Dear All,
>>>>>
>>>>> I am new to qt-creator, and I am using it mainly to write my C++
>>>>> programs on a Linux machine (Fedora 12). Basically, my projects are
>>>>> "Empty Qt4" ones.
>>>>>
>>>>> My question is: how can one configure qt-creator for optimizing for
>>>>> speed the C++ programs edited with qt-creator?
>>>>>
>>>>> Thanks in advance,
>>>>>
>>>>> Paul
>>>>> _______________________________________________
>>>>> Qt-creator mailing list
>>>>> Qt-creator@trolltech.com
>>>>> http://lists.trolltech.com/mailman/listinfo/qt-creator
>>>>>
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