'do {} while (0)' replacement

[Frank Mehnert <fm3@xxxxxxxxxxxxxxxxxxxx>]

Hi,

I'm searching for a replacement of

  do {} while (0)

in a macro definition.

My problem is the following:

  #define BREAK_ON_ERROR(i)   \
    if (1)                    \
    {                         \
      if (i < 0)              \
        break;                \
    }                         \
    else do                   \
    {                         \
    } while (0)               \

  int foo(void)
  {
    for (;;)
    {
      int bar = 1, buzz = 2;
      if (bar)
        BREAK_ON_ERROR(buzz);
    }
  }

gcc-4.3 will warn with 

  'warning: suggest explicit braces to avoid ambiguous `else'

Any hints for a clever replacement of 'do {} while (0)' in this
case? Of course, enclosing the BREAK_ON_ERROR statement like

  if (bar)
  {
    BREAK_ON_ERROR(buzz)
  }

is possible but not what I want :-)

Thanks in advance,

Frank
-- 
## Dept. of Computer Science, Dresden University of Technology, Germany ##
## http://os.inf.tu-dresden.de/~fm3                                     ##

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