[llvm-bugs] [Bug 46913] New: -Wuninitialized inside lambda

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46913

            Bug ID: 46913
           Summary: -Wuninitialized inside lambda
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: federico.kircheis at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

I've a bug that GCC was able to avoid thanks to "-Wuninitialized -O1", but that
clang fails to diagnose.

The reduced test-case is

----
int main() {
    int i = [&](){return i;}();
    return i;
}
----

I've tried compiling with "-Weverything -Wno-c++98-compat -O2" and other
optimizations level, without any luck.


Notice that

----
int main() {
    int i = i;
    return i;
}
----

gets diagnosed correctly with "warning: variable 'i' is uninitialized when used
within its own initialization [-Wuninitialized]".


Another example where clang does not emit any diagnostic but GCC does:

----
int main() {
    int i;
    [&](){i++;}();
    return i;
}
----

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