[LLVMbugs] [Bug 7975] New: chained comparisons lacking warning gcc has

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7975

           Summary: chained comparisons lacking warning gcc has
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: evan at chromium.org
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


We were just marveling at the gcc warning on the following code:

bool x = 3 < 4 < 5;

test.cc:3: warning: comparisons like ‘X<=Y<=Z’ do not have their mathematical
meaning

So I thought to see what clang thinks of it.  No warning at all!

(llvm/clang r111814)

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