[Bug preprocessor/17798] [3.4/4.0 Regression] high cpp memory usage with undefined symbols

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-12-14 05:53 -------
The first thing is that read_file_guts mallocs the whole file which seems wrong.  That accounts for 
500M.
The next problem is that keep every identifier we parsed even though we don't need it.
3014 calls for 12,273,008 bytes: thread_a000a1ec |0x0 | _dyld_start | _start | main | toplev_main | 
do_compile | compile_file | c_common_parse_file | c_parse_file | yyparse | yylex | _yylex | c_lex | 
c_lex_with_flags | cpp_get_token | _cpp_lex_token | _cpp_handle_directive | do_ifdef | lex_macro_node 
| _cpp_lex_token | _cpp_lex_direct | lex_identifier | ht_lookup_with_hash | _obstack_newchunk | 
xmalloc | malloc | malloc_zone_malloc 

And this is where the problem comes from.
No there is no leak we keep a reference to all of thes identifiers but this seems like we should not.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[3.4/4.0 Regression] cpp    |[3.4/4.0 Regression] high
                   |memory leak with undefined  |cpp memory usage with
                   |symbols                     |undefined symbols


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17798