ref: 7761303503062221973c8bd9bad4cb019cebe7f6
dir: /cc1/TODO/
* Implement constant expressions * Verify correctness in initializators * emit initializators * emit structures definition * Define array types based in the value of constant expressions * Rewrite decl.c and use only one decl function with a function pointer parameter * Allow external declarations of incomplete array types * Implement bitfields * Define data structure shared between cc1 and cc2 with the type information * Rewrite error recovery code, and ensure correct state after recovery * Allow comparisions between pointers and 0 * Implement function calls * Parse correctly all integer and float constants * Add C99 features (almost all the new features of C99 are missed) * Add correct emit for any kind of constant