Initializer is not a constant only with certain functions

Question

If I try compile the following and I have /O2 optimisation on, then it doesn't compile:

#include <math.h>


double myfunc(double arg) { return 5.4; };


double (*f[])(double) = { 
    myfunc,
    fabs, 
   // floor,  // THESE TWO TRIGGER THE ERROR
   // ceil, // initialiser is not a constant 
    sqrt
};

Only the floor and ceil functions trigger the error. If I put this code in a cpp file it compiles fine, but it seems MSVC's compiler is bugged, or am I doing something wrong? Error only happens on /O2, not /O1 or disabled. I'm on Visual Studio Version 17.7.6. Windows SDK version is 10.0 (latest installed version).

Answer 1

It is unrelated to the optimisation settings.

It is only because of the Enable Intrinsic Functions settings. If you set this to NO, it compiles fine. With this setting set to Yes (/Oi) I get the same errors.

• Visual Studio 2022 17.8.0
• Platform toolset : Visual Studio 2022 (v143)
• Windows SDK Version : 10.0.22621.0 (latest installed version)