Created attachment 477849 [details]
preprocessed source

Description of problem:
mysterious warning with -DNDEBUG, -Wall using boost::optional 

Version-Release number of selected component (if applicable):
gcc-4.6.0-0.6.fc15.x86_64

How reproducible:
100%

Steps to Reproduce:
1. g++ -c -O2 -Wall -DNDEBUG foo.cxx
or
2. g++ -c -O2 -Wall foo.ii
  
Actual results:
foo.cxx:47:9: warning: ‘*((void*)& aNewItem +8)’ may be used uninitialized in this function [-Wuninitialized]

Expected results:
Either no warning, or a better line location to indicate where the error lies.

Additional info:
Couple of other very similar examples included in the foo.cxx don't trigger the warning and gcc 4.5.X didn't warn about this.