gcc misses the access to the uninitialized member S::i in the program below and fails to issue a warning for it.
I would expect to see a warning not only for the access to the member but also for the definition of the user-defined constructor that fails to initialize the data member. $ cat t.cpp && gcc -Wuninitialized -Wall -Wextra -W -c t.cpp int main () { struct S { int i; S() { } } s; return s.i; } -- Summary: missing -Wuninitialized warning on a user-defined class ctor Product: gcc Version: 4.4.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: msebor at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42000