[LLVMbugs] [Bug 20082] New: Feature request: warn on `a < b < c`

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20082

            Bug ID: 20082
           Summary: Feature request: warn on `a < b < c`
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mimomorin at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

For C primers, it would be useful to warn on `a < b < c`: 

    int main(int argc, char* argv[])
    {
        int a = 2;
        int b = 3;
        int c = 4;
        if (a < b < c) {
            /* ... */
        }
    }

I think it makes sense to warn on these codes 
as the compiler emits warnings on codes like `if (a = b)`.

P.S. gcc emits warnings on such codes.

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