D15764: [Custom-DefinesAndIncludes]: Objective-C++ support

[René J.V. Bertin]

rjvbb added a comment.


  `__builtin_unreachable()` does have strange effects:
  
    #include <stdio.h>
    
    int foo(int doit)
    {
         switch(doit) {
              case 0:
              case 1:
              case 2:
                   return doit;
              default:
                   __builtin_unreachable();
         }
    }
    
    int main(int argc, char *argv[])
    {
         fprintf(stderr, "foo(0)=%d\n", foo(0));
         foo(1);
         foo(2);
         fprintf(stderr, "unreachable foo(4)=");
         fprintf(stderr, "%d\n", foo(4));
         return 0;
    }
  
  Depending on how and with what compiler I build this, the program either loops (from the `foo(4)` call back to the start of `main`) until it SEGVs, or it terminates after printing `foo(4)=4`
  
  IOW, it looks like it just causes UB in release builds when the assert is removed from Q_UNREACHABLE :-/

REPOSITORY
  R32 KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D15764

To: rjvbb, #kdevelop, aaronpuchert
Cc: aaronpuchert, kdevelop-devel, glebaccon, antismap, iodelay, vbspam, geetamc, Pilzschaf, akshaydeo, surgenight, arrowd
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