TODO list:

- bug with defines:
    #define spin_lock(lock) do { } while (0)
    #define wq_spin_lock spin_lock
    #define TEST() wq_spin_lock(a)
- typedefs can be structure fields
- see bugfixes.diff + improvement.diff from Daniel Glockner
- constructors
- cast bug (Peter Wang)
- define incomplete type if defined several times (Peter Wang).
- long long constant evaluation
- configure --cc=tcc (still one bug in libtcc1.c)
- disable-asm and disable-bcheck options
- test binutils/gcc compile
- add alloca(), __builtin_expect()
- gcc '-E' option.
- optimize VT_LOCAL + const
- tci patch + argument.
- '-b' bug.
- atexit (Nigel Horne)
- see -lxxx bug (Michael Charity).
- see transparent union pb in /urs/include/sys/socket.h
- precise behaviour of typeof with arrays ? (__put_user macro)
- #include_next support for /usr/include/limits ?
  but should suffice for most cases)
- handle '? x, y : z' in unsized variable initialization (',' is
  considered incorrectly as separator in preparser)
- function pointers/lvalues in ? : (linux kernel net/core/dev.c)
- transform functions to function pointers in function parameters (net/ipv4/ip_output.c)
- fix function pointer type display
- fix bound exit on RedHat 7.3
- check lcc test suite -> fix bitfield binary operations
- check section alignment in C
- fix invalid cast in comparison 'if (v == (int8_t)v)'
- packed attribute
- finish varargs.h support (gcc 3.2 testsuite issue)
- fix static functions declared inside block
- C99: add variable size arrays (gcc 3.2 testsuite issue)
- C99: add complex types (gcc 3.2 testsuite issue)
- postfix compound literals (see 20010124-1.c)
- fix multiple unions init
- setjmp is not supported properly in bound checking.
- better local variables handling (needed for other targets)
- fix bound check code with '&' on local variables (currently done
  only for local arrays).
- sizeof, alignof, typeof can still generate code in some cases.
- bound checking and float/long long/struct copy code. bound
  checking and symbol + offset optimization
- Fix the remaining libtcc memory leaks.
- make libtcc fully reentrant (except for the compilation stage itself).
- '-MD' option

Optimizations:

- suppress specific anonymous symbol handling
- more parse optimizations (=even faster compilation)
- memory alloc optimizations (=even faster compilation)

Not critical:

- C99: fix multiple compound literals inits in blocks (ISOC99
  normative example - only relevant when using gotos! -> must add
  boolean variable to tell if compound literal was already
  initialized).
- add PowerPC or ARM code generator and improve codegen for RISC (need
  to suppress VT_LOCAL and use a base register instead).
- interactive mode / integrated debugger
- fix preprocessor symbol redefinition
- better constant opt (&&, ||, ?:)
- add portable byte code generator and interpreter for other
  unsupported architectures.
- C++: variable declaration in for, minimal 'class' support.
- win32: add __stdcall, __intxx. use resolve for bchecked malloc et
  al. check GetModuleHandle for dlls. check exception code (exception
  filter func).
- handle void (__attribute__() *ptr)()