[LLVMbugs] [Bug 12669] New: Constant expressions in constant context not evaluated as such

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12669

             Bug #: 12669
           Summary: Constant expressions in constant context not evaluated
                    as such
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: llvm-bugs at quasiparticle.net
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


The attached code returns 1 when compiled with -O2 or higher, and fails to link
otherwise. Either the program does not admit a constexpr foo::contains (which
clang should diagnose here in all cases, since the function is used in constant
context), or the optimizers are smarter than the clang constexpr evaluator.

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