Compilation errors in qt header files vs 2010 - visual-studio-2010

Question

I am trying to test my qt project with cppunit. The tests project uses MFC.
I am using Visual studio 2010.
I have included the qt libraries , dlls and made other changes in the project settings like adding preprocessor definitions to compile the cpp file which I want to test. But when I compile this cpp file, I get a lot of syntax errors, located in qt header files..The compilation output is given below:
1>------ Build started: Project: my_tests, Configuration: Debug Win32 ------
1>cl : Command line warning D9025: overriding '/ZI' with '/Zi'
1>cl : Command line warning D9025: overriding '/GS' with '/GS-'
1>cl : Command line warning D9025: overriding '/Zc:wchar_t' with '/Zc:wchar_t-'
1> CSetting.cpp
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qiodevice.h(247): error C2143: syntax error : missing ')' before 'constant'
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qiodevice.h(247): error C2143: syntax error : missing ';' before 'constant'
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qiodevice.h(247): error C2805: binary 'operator <<' has too few parameters
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qiodevice.h(247): error C2059: syntax error : ')'
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(160): error C2143: syntax error : missing ')' before 'constant'
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(160): error C2143: syntax error : missing ';' before 'constant'
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(160): error C2805: binary 'operator <<' has too few parameters
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(160): error C2988: unrecognizable template declaration/definition
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(160): error C2059: syntax error : 'constant'
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(160): error C2065: 'T' : undeclared identifier
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(160): error C2059: syntax error : ')'
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(178): error C2065: 'T' : undeclared identifier
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(180): error C2143: syntax error : missing ';' before '{'
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(180): error C2447: '{' : missing function header (old-style formal list?)
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(190): error C2143: syntax error : missing ')' before 'constant'
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(190): error C2143: syntax error : missing ';' before 'constant'
1>c:\qt\4.8.2\include\qtcore\../../src/corelib/io/qdebug.h(190): fatal error C1903: unable to recover from previous error(s); stopping compilation
Please help me with these errors..

Answer 1

You must be using QT 4.8.x or older.
All version before QT 5.x are compiled with
/Zc:wchar_t-
(it means: DO NOT treat WChar_t as built in type) which is not compatible with MFC, BOOST or CUDA libraries.
You need to switch to QT 5.x in which the flag changed to
/Zc:wchar_t
(without "minus" on the end) - it is compiled this way (they considered this as a flaw).
Or compile older version with /Zc:wchar_t, by changing it in source file:
QTSRC\mkspecs\win32-msvc2010\qmake.conf

Answer 2

I can only guess, but you sometimes get these kind of errors if you are missing the final semicolon after a class definition, or a closing bracket at any point.
class XXX
{
}; // <- this one could be missing
in your CSettings.cpp, check which file you include directly before QIODevice or QDebug. This is usually the faulty class (could be CSettings.h)