include/cln/modules.h

   1 // Macros for correct module ordering.
   2
   3 #ifndef _CL_MODULES_H
   4 #define _CL_MODULES_H
   5
   6 // global constructor/destructor naming.
   7 #include "cln/config.h"
   8
   9 // Concatenation of macroexpanded tokens.
  10 // Equivalent to CL_CONCAT in src/base/cl_macros.h which we do not want
  11 // to expose, however.
  12 #define CL_CONCATENATE_(xxx,yyy)  xxx##yyy
  13 #define CL_CONCATENATE(xxx,yyy)  CL_CONCATENATE_(xxx,yyy)
  14
  15 // Sometimes a link time dependency is needed, but without requirements
  16 // on initialization order.
  17 //
  18 // CL_FORCE_LINK(dummy,external_variable)
  19 // forces a link time reference to the external_variable.
  20 #include <cstdlib>
  21 #if 0
  22 // This definition does not work.  It gets optimized away by g++ 3.1.
  23 #define CL_FORCE_LINK(dummy,external_variable) \
  24   static const void* const dummy[] = { &dummy, &external_variable };
  25 #else
  26 #define CL_FORCE_LINK(dummy,external_variable) \
  27   static const                                                          \
  28   struct dummy {                                                        \
  29     inline dummy () {                                                   \
  30       if ((void*) &external_variable == (void*) this)                   \
  31         abort();                                                        \
  32     }                                                                   \
  33   }                                                                     \
  34   CL_CONCATENATE(dummy,_instance);
  35 #endif
  36
  37 #endif /* _CL_MODULES_H */