Q_PROCESSOR_... defines are NOT available for moc compiler

In qprocessordetection.h the processor definitions for x86 are defined as follows:

#  if defined(_M_IX86)
#    define Q_PROCESSOR_X86     (_M_IX86/100)
#  elif defined(__i686__) || defined(__athlon__) || defined(__SSE__) || defined(__pentiumpro__)
#    define Q_PROCESSOR_X86     6
#  elif defined(__i586__) || defined(__k6__) || defined(__pentium__)
#    define Q_PROCESSOR_X86     5
#  elif defined(__i486__) || defined(__80486__)
#    define Q_PROCESSOR_X86     4
#  else
#    define Q_PROCESSOR_X86     3
#  endif

defines like _i686_ are defined by compiler. This means that the define is not available for the moc compiler. If you want to compile for X86 and you have a construct like this

#ifndef Q_PROCESSOR_X86

private slots:

void doSomeNonX86Things(void);

#endif

for moc compiler slot doSomeNonX86Things is part of the code (because Q_PROCESSOR_X86 is not defined) and for X86 compiler method doSomeNonX86Things ist NOT part of the code (because Q_PROCESSOR_X86 is defined). In this case code could not be compiled for X86.