sin() and cos() in C++ function gives link error

Building my libraries on Mac suddenly started to fail with XCode Version 11.3 (11C29).

I was able to isolate one problem:

It seems that when you use sin and cos in the same function, the optimizer will use __sincosf_stret to calculate both at once but this result in a link error.

So what did I do:

1. Create a new XCode project, cmd line tool, objectiv-c
2. Change the main.m to main.mm to allow C++
3. Change main as:

#import <Foundation/Foundation.h> 
#include <cmath>  
void coordinateCalculator(float angle, float radius, float& x, float& y) 
{ 
   float mySin = sin(angle); 
   float myCos = cos(angle); 
   x = radius * myCos; 
   y = radius * mySin; 
}  
int main(int argc, const char * argv[]) 
{ 
  @autoreleasepool 
  { 
    float myAngle = 0.0; 
    float theX, theY; 
    float radius = 100.0; 
    while (myAngle < 360.0) 
    { 
      coordinateCalculator(myAngle, radius, theX, theY); 
      NSLog(@"My coordinates: %f, %f",theX,theY); 
      myAngle += 1.0; 
    } 
  } 
  return 0; 
}

I'm using in my project:

• C++: C++14, libC++
• Base SDK: MacOS
• Deployment target 10.14

Building in Debug works fine, building for profiling (Release version with optimization) will fail giving the following error message:

Undefined symbols for architecture x86_64:
  "___sincosf_stret", referenced from:
  coordinateCalculator(float, float, float&, float&) in main.o
  _main in main.o
ld: symbol(s) not found for architecture x86_64

When I change the deployment target to 10.7, the sincosf_stret is found, but I get 2 ARC errors:

Undefined symbols for architecture x86_64:
  "_objc_loadClassref", referenced from:
  __ARCLite__load() in libarclite_macosx.a(arclite.o)
  "_objc_readClassPair", referenced from:
  __ARCLite__load() in libarclite_macosx.a(arclite.o)
ld: symbol(s) not found for architecture x86_64

Trying different deployment targets give:

• 10.7: 2 ARC link errors
• 10.10: 2 ARC link errors AND _sincosf_ret error
• 10.12 or higher: _sincosf_ret error

I can't belief that it is not possible to use sin/cos in one function. So I hope someone has a hint to resolve this problem. I have to build multiplatform libraries. It worked fine for years. Recently I switched to XCode 11 and to BaseSDK "MacOS". Before I used some special tool to reinstall BaseSDK 10.7 for XCode 9. I wanted to get rid of the necessety of using this special tool for reinstalling BaseSDK 10.7 after each XCode update.

Thanks,

Rudi