2 - eliminate target_architecture.h and replace with stuff in lang_features.h
5 - Add preprocessor code.
6 - proper handling of different file encodings, parsing non-ascii strings
7 - We could save some space by holding source positions in a separate (somehow
8 compressed table) and only storing pointers to it on the AST.
11 - disallow storage class specifiers in struct/union members
12 - add constant folding code (optional, ast2firm already does it)
13 - Refactor code, so code to handle number values (and strings?) is an own
15 - Add columns to source positions
16 - SourcePositions could be stored selectively on expressions that really need
18 - check semantic for functions declared/defined in global scope and declared
19 again in a local scope
20 - for errors relating to function argument, print number of argument
21 - print initialisation type_path for initializer errors
24 - output source file positions for panics.
25 - handle bitfield members with 0 correctly (standard says they finish the
29 - goto over VLA declarations
32 - dead assignments (int x = 5; x = bla(); -> dead assignment at x = 5;)
33 - catch the if(k = b) cases, maybe require all assignments to be in parentheses
34 (but some few exceptions like toplevel, nested assignments)
35 - warn when folding shift constants with too large shift amounts
38 - delete output file if we had an error
39 - go through gcc manual and emulate all the gcc flags...