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Created attachment 19758 [details]
g++ -O -Wuninitialized -S 1.cc
Older g++s issue a warning:
pr42905.cc: In function ‘void f()’:
pr42905.cc:5: warning: ‘s.S::i’ is used uninitialized in this function
pr42905.cc:11: note: ‘s.S::i’ was declared here
(In reply to comment #1)
Sorry, it should be pr42905.cc, not 1.cc
It's optimized away before giving us a chance to warn about it. Such is life.