[Interest] qmake and CONFIG += c++14

[Wilhelm]

Am 25.03.2015 um 12:03 schrieb Allan Sandfeld Jensen:
> On Wednesday 25 March 2015, Wilhelm wrote:
>> Hi all,
>>
>> the qmake documentation says that is is possible to set
>>
>> CONFIG+= c++14
>>
>> But if I do so, the generated makefile still contains the flag
>>
>> -std=c++11
>>
>> So, whats wrong here?
> 
> You can check mkspecs/features/c++14.prf for the conditions that triggers it.
> 
> It should have worked. You probably need a cleaner build.
> 

As you can see running qmake with linux-clang doesn't work:

⌁68% [lmeier:/home/lmeier/Lehre/Eigene/Prog2NeuesKonzept/SS2015/vl01] $
qmake -spec linux-clang

⌁68% [lmeier:/home/lmeier/Lehre/Eigene/Prog2NeuesKonzept/SS2015/vl01] $
make clean all
rm -f main.o
rm -f *~ core *.core
clang++ -c -pipe -O2 -march=x86-64 -mtune=generic -O2 -pipe
-fstack-protector-strong --param=ssp-buffer-size=4 -std=c++11 -Wall -W
-fPIE  -I. -I/usr/lib/qt/mkspecs/linux-clang -o main.o main.cc
clang++ -ccc-gcc-name g++ -o vl01 main.o


But running qmake with linux-g++ does work:

⌁68% [lmeier:/home/lmeier/Lehre/Eigene/Prog2NeuesKonzept/SS2015/vl01] $
qmake -spec linux-g++

⌁68% [lmeier:/home/lmeier/Lehre/Eigene/Prog2NeuesKonzept/SS2015/vl01] $
make clean all
rm -f main.o
rm -f *~ core *.core
g++ -c -pipe -O2 -march=x86-64 -mtune=generic -O2 -pipe
-fstack-protector-strong --param=ssp-buffer-size=4 -std=c++1y -Wall -W
-fPIE  -I. -I/usr/lib/qt/mkspecs/linux-g++ -o main.o main.cc
g++ -Wl,-O1 -Wl,-O1,--sort-common,--as-needed,-z,relro -o vl01 main.o



-- 
Wilhelm
w.meier at unix.net