qmake how to add extra flags

Question

I am using qmake to cross-compile my ARM based program on Ubuntu. I have ran into the multithreading issue as described in this thread:

C++ 11 Threads, Error Pure virtual function called

One answer suggests adding the flag to the compilation as:

g++ -pthread -std=c++11 -D__GCC_HAVE_SYNC_COMPARE_AND_SWAP_{1,2,4} thread1.cpp

I am not sure how to add this -D__GCC_HAVE_SYNC_COMPARE_AND_SWAP_{1,2,4} in my qmake project file.

I did QMAKE_CXXFLAGS += -D__GCC_HAVE_SYNC_COMPARE_AND_SWAP_{1,2,4}. My error still remains so I wanted to confirm if this is the right way to add that flag.

Answer 1

It's a bash glob/wildcard. Expands to

-D__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 -D__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 -D__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4