Compiler Options [Solved]

nickninevah

Hi all.

I am trying to pass options to the compiler in Qt Creator. I'm new to Qt. Please take pity and explain why when I pass options to the compiler in creator, my program won't compile. But if I use the compiler directly via the command line with options, everything goes fine.

OS: OpenSUSE Linux 12.3 (64 bit)
Compiler: g++
QT: 4.8.4 (64 bit)
Creator: 2.6.2

I passed options to the compiler with the following entries in my .pro file.

@QMAKE_CXXFLAGS += -O2
QMAKE_CXXFLAGS += -llapack
QMAKE_CXXFLAGS += -lblas@

I tried running this directly on the command line.

@g++ -O2 -llapack -lblas main.cpp@

Works just fine.

But in Qt Creator, doesn't work. I checked my compile output, and I can see that the options are included.

@10:06:31: Running steps for project testArma1...
10:06:31: Starting: "/usr/bin/qmake" /home/nicholas/Development/testArma1/testArma1.pro -r -spec linux-g++-64 CONFIG+=debug CONFIG+=declarative_debug
10:06:31: The process "/usr/bin/qmake" exited normally.
10:06:31: Starting: "/usr/bin/make" -w
make: Entering directory /home/nicholas/Development/testArma1-build-Desktop-Debug' g++ -c -m64 -pipe -O2 -llapack -lblas -g -Wall -W -D_REENTRANT -DQT_WEBKIT -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++-64 -I../testArma1 -I/usr/include/QtCore -I/usr/include -I. -I../testArma1 -I. -o main.o ../testArma1/main.cpp ../testArma1/main.cpp:8:5: warning: unused parameter 'argc' [-Wunused-parameter] ../testArma1/main.cpp:8:5: warning: unused parameter 'argv' [-Wunused-parameter] g++ -m64 -o testArma1 main.o -L/usr/lib64 -lQtCore -L/usr/lib64 -lpthread main.o: In function gemv<double>':
/usr/include/armadillo_bits/blas_wrapper.hpp:39: undefined reference to dgemv_' main.o: In function gemm<double>':
/usr/include/armadillo_bits/blas_wrapper.hpp:74: undefined reference to dgemm_' main.o: In function gemv<double>':
/usr/include/armadillo_bits/blas_wrapper.hpp:39: undefined reference to dgemv_' main.o: In function dot<double>':
/usr/include/armadillo_bits/blas_wrapper.hpp:140: undefined reference to ddot_' collect2: error: ld returned 1 exit status make: Leaving directory /home/nicholas/Development/testArma1-build-Desktop-Debug'
make: *** [testArma1] Error 1
10:06:38: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project testArma1 (kit: Desktop)
When executing step 'Make'@

I even tried using the exact Qt command in the command line, minus the Qt variables.

@g++ -c -m64 -pipe -O2 -llapack -lblas -g -Wall -W -I/usr/share/qt4/mkspecs/linux-g++-64 -I../testArma1 -I/usr/include/QtCore -I/usr/include -I. -I../testArma1 -I. -o main.o ../testArma1/main.cpp@

And that worked fine. I assume something important is happening in the Qt variables. But I'm too new at this to know what. Any help please?

SGaist

Hi,

Your options are passed but they are wrong (except for the O2).

-llapack and -lblas are linker options and since these are "libraries" options what you need to do is:

@LIBS += -llapack -lblas@

in your pro file and you should be good

nickninevah

You were right. Worked perfect once I added those as libs. Thanks!