[LLVMbugs] [Bug 15507] New: warn about signed, unsigned arithmetic

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15507

            Bug ID: 15507
           Summary: warn about signed, unsigned arithmetic
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: eric.huhtala at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

It would be nice to have a warning about signed vs. unsigned arithmetic, e.g.
the following:

int s = -1;
unsigned int u = 2;
signed d = u / s;
std::cout << d << std::endl; // prints '0', not '-2' as some might expect.

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