[LLVMbugs] [Bug 15621] New: __builtin_popcount should be constexpr

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15621

            Bug ID: 15621
           Summary: __builtin_popcount should be constexpr
           Product: clang
           Version: 3.2
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: steveire at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

switch(argc)
  {
    case __builtin_popcountll(2):
      return 1;
    default:
      return 0;
  }


$ g++ -std=c++11 main.cpp
$ clang++ -std=c++11 main.cpp
main.cpp:228:10: error: case value is not a constant expression
    case __builtin_popcountll(2):
         ^
1 error generated.

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