Re: Compiling (development) Emacs with MSVC

[Tom Tromey]

Stefan> IIUC gcc uses something like
Stefan>    ENUM_BF(Lisp_Misc_Type) tag : 3;
Stefan> where ENUM_BF(x) can either turn into "enum x" or "unsigned int"
Stefan> depending on whether the compiler supports unsigned bit fields.
   
gdb uses:

/* Be conservative and use enum bitfields only with GCC.
   This is copied from gcc 3.3.1, system.h.  */

#if defined(__GNUC__) && (__GNUC__ >= 2)
#define ENUM_BITFIELD(TYPE) enum TYPE
#else
#define ENUM_BITFIELD(TYPE) unsigned int
#endif


GCC uses:

/* Be conservative and only use enum bitfields with GCC.
   FIXME: provide a complete autoconf test for buggy enum bitfields.  */

#if (GCC_VERSION > 2000)
#define ENUM_BITFIELD(TYPE) __extension__ enum TYPE
#else
#define ENUM_BITFIELD(TYPE) unsigned int
#endif


Tom