[SOLVED] Using the STXXL library with Qt

[isaacEnrique]

Greetings.

I want to use the STXXL library in my Qt project, but I can not get it (basically, this describes the whole problem).

Install the STXXL library and then built and run some test programs to make sure that the installation was fine. I use CMake for to build these sample programs.

Now, for work with Qt + STXXL, I try to add the following lines to my Qt project file (.pro file):

@
INCLUDEPATH += /usr/include/stxxl
LIBS += -lpthread -lstxxl
@

However, this did not work.

I say, moreover, that the error messages given by Qt creator don't appear to be related to STXXL (actually I don't know that those messages should be or where those messages come from). For example, I get error messages like the following:

/usr/include/c++/4.9.0/parallel/multiway_mergesort.h: 421: error:undefined reference to `omp_get_num_threads'.

I welcome any help and/or suggestions that brings light to this problem.
Thanks in advance.

[andreyc]

Looks like omp_get_num_threads is a part of OpenMP.
I guess you need to include OpenMP as well or disable some STXXL options to prevent using OpenMP.

[isaacEnrique]

I have also

@QMAKE_CXXFLAGS +=-fopenmp@

into me .pro ​​file.

Still I get the errors mentioned above.

[isaacEnrique]

Greetings.

Some time ago I found the solution to the problem, but had forgotten to post about it. You have to add the following lines in the project file (.pro file):

@
INCLUDEPATH += /usr/include
LIBS += -lpthread -lgomp -lstxxl_debug

Compiler Config

QMAKE_CXXFLAGS += -fopenmp
@

I apologize for not posting before and I hope this post will be helpful to anyone trying to work with Qt + STXXL.