[Interest] Force use of QMAKE CXXFLAGS set through ENV Var

[Oliver Niebuhr]

Oops. Small Correction. Dumb Copy and Paste Error. It is:
* SET QMAKE=-project "QMAKE_CXXFLAGS+=-pipe"

And I forgot to mention, I also tried:
* doskey g++=g++ -pipe
* doskey gcc=gcc -pipe
Oliver

On 16/10/2018 09:51, Oliver Niebuhr wrote:
> Morning everyone.
> 
> OS: Windows 10
> Compiler: MingW-64, 8.1.0
> Qt: 5.12, latest Git (but not really important in that case)
> 
> What do I want:
> A.) Build Qt5 from Source
> A.1.) While forcing "g++" to use the flag "-pipe", without modifying 
> "QMAKE.CONF" in the local Git Directory every time.
> 
> I tried:
> Setting the following Environment Variables in the Windows CMD Shell:
> 
> * SET QMAKE="QMAKE_CFLAGS+=-pipe QMAKE_CXXFLAGS+=-pipe"
> * SET QMAKE_CFLAGS+="-pipe"
> * SET QMAKE_CXXFLAGS+="-pipe"
> * SET G++="-pipe"
> * SET QMAKE=-project "QMAKE_CXXFLAGS+=-std=c++11"
> 
> I tested with and without the --> "" <--
> 
> I also tried to use it as a Configure Parameter. For Example:
> * %SystemDrive%\qt5srcgit\qt5\configure -verbose -platform win32-g++ 
> -c++std c++1z -opensource -confirm-license QMAKE_CXXFLAGS+=-pipe
> * %SystemDrive%\qt5srcgit\qt5\configure -verbose -platform win32-g++ 
> -c++std c++1z -opensource -confirm-license -device-option 
> QMAKE_CXXFLAGS+=-pipe
> 
> If anyone could point me to the right Direction, I would be very 
> grateful! All the Stuff I have tried, is from the Internet and the Qt5 
> Configure Script. And yes, I am aware that it makes not much difference 
> using "-pipe" these Days. Its about reducing write cycles on my SSD. And 
> also figuring out, how to optimize my Linux Scripts / Windows Batch 
> Files further.
> 
> Thanks!
> Oliver
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