[llvm-bugs] [Bug 47640] New: -Wdangling-gsl only warns on initialization and not on assignment

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47640

            Bug ID: 47640
           Summary: -Wdangling-gsl only warns on initialization and not on
                    assignment
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rtrieu at google.com
                CC: gribozavr at gmail.com, llvm-bugs at lists.llvm.org,
                    m.gehre at gmx.de, neeilans at live.com,
                    richard-llvm at metafoo.co.uk, xazax.hun at gmail.com

-Wdangling-gsl is a warning that catches dangling pointers.  This warning
catches a lot of lifetime bugs, but it only does so during initialization. 
Similar code that causes a dangling pointer during assignments does not get a
warning.

#include <string>
#include <string_view>
#include <memory>

std::string get_string();
std::unique_ptr<int> get_int();

int main() {
  std::string_view sv = get_string();  // Warning on initialization
  sv = get_string();                   // No warning on assignment

  int *p = get_int().get();  // Warning on initialization
  p = get_int().get();       // No warning on assignment
}

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