Bug 676361

Summary: warning: ‘*((void*)& aNewItem +8)’ may be used uninitialized in this function
Product: [Fedora] Fedora Reporter: Caolan McNamara <caolanm>
Component: gccAssignee: Jakub Jelinek <jakub>
Status: CLOSED UPSTREAM QA Contact: Fedora Extras Quality Assurance <extras-qa>
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Version: rawhideCC: bkoz, jakub
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Last Closed: 2011-02-10 15:05:01 UTC Type: ---
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Description Caolan McNamara 2011-02-09 16:12:00 UTC
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.

Comment 1 Caolan McNamara 2011-02-09 16:12:22 UTC
Created attachment 477850 [details]
unprocessed source

Comment 2 Jakub Jelinek 2011-02-10 15:05:01 UTC
Tracking upstream as PR47679.