General search for symbols...

[Ilia Dyatchkov]

>I am trying to port GCC to another machine.
>Given that I have a file <new gcc
>path>/gcc/config/<machine>/<machine>.c, how would I, within any of the
>functions in that file find out if a certain symbol has been defined by
>a "#define" statement in the C source that is being compiled?
>
>E.g., the source file consists of one line:
>#define DEFINED_CONSTANT_2
>
>Note: my call to print_node CRASHES the compiler.
>
>I have tried various versions of:
>
>  if((decl = getdecls()))
>    print_node(stderr,"tree: ",decl,4);  /* this CRASHES!!! */

Try debug_tree(decl);

>
>  for ( ; decl; decl = TREE_CHAIN (decl))
>  {
>    if (TREE_CODE (decl) == IDENTIFIER_NODE)
>    {
>      if(!strcmp(IDENTIFIER_POINTER(decl),"DEFINED_CONSTANT_1"))
>        fprintf(stderr,"DEFINED_CONSTANT_1" found, code 
>%d\n",TREE_CODE(decl));
>      else if(!strcmp(IDENTIFIER_POINTER(decl),"DEFINED_CONSTANT_2"))
>        fprintf(stderr,"DEFINED_CONSTANT_2 found, code
>%d\n",TREE_CODE(decl));
>    }
>  }