[Qt-creator] QMAKE_CXXFLAGS += -Wno-multichar doesn't work on Mac

[Stephen Chu]

So I need to suppress multi-character warning in one of the header 
files. I tried #pragma GCC diagnostic ignored "-Wmultichar" thinking it 
will just disable the warning for that file. It didn't work on either 
Mac or Windows. I may have misunderstood what it mean but on to the next 
option.

I then add QMAKE_CXXFLAGS += -Wno-multichar to my pro file, which will 
disable that warning for all of my files. Not great. But at least it 
will make those warnings go away.

It does. Only on Windows. However I tried, the same warnings persist on 
Mac. I checked the compile output and it is indeed part of the g++ call.

So what's going on? How do I suppress the particular warning?

Thanks.

PS. This is with Creator 2.2 snapshots and Qt 4.7.2.

-- 
Stephen Chu