[llvm-bugs] [Bug 37848] New: sinh vs asinh vs constexpr

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37848

            Bug ID: 37848
           Summary: sinh vs asinh vs constexpr
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zhonghao at pku.org.cn
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

The code is as follow:

namespace std {
 constexpr double asinh (double x) { return __builtin_asinh (x); }
}

int main()
{
 constexpr double das = std::asinh(1.0); 
}

clang++ produces errors:
error: constexpr function never produces a constant expression
[-Winvalid-constexpr]
     constexpr double asinh (double x) { return __builtin_asinh (x); }

 note: subexpression not valid in a constant expression
     constexpr double asinh (double x) { return __builtin_asinh (x); }
error: constexpr variable 'das' must be initialized by a constant expression
     constexpr double das = std::asinh(1.0); 

g++ accepts the above code. The code comes from a gcc bug report:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49813


The report has a long discussion on this issue. Please check the report. It
seems to be a bug in clang++.

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