function entry+exit echo,

[lazer1]

Hello,

can I customise gcc so that when code is compiled
function entry and exit is customised,

eg if

f( ........ )
{
....
}

is compiled, I'd like on entry of f eg a shell echo to happen:


if(some_env_variable_is_set())
   {
   int i ;
   for( i = 0 ; i < nest_count ; i++ )printf(" ") ;
   printf("%s %d %d{\n", __FILE__, __LINE__, nest_count );
   }
nest_count++ ;


and at all exit points
if( some_env_variable_is_set() )
   {
   int i ;
   for( i = 0 ; i < nest_count ; i++ )printf(" ") ;
   printf("}\n")
   }
nest_count-- ;

where nest_count is a global variable and some_env_variable_is_set() is 
a function I've defined, (I'll write the latter function in a way to prevent
infinite recursion for when it is compiled!)


that way for debugging I can by setting the env variable 
locally track all function calls,

in case it is relevant I'm interested in this for 68k and PPC gcc's,





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