gcc 4.5.0 stddef.h clobbers __size_t with #define, breaks VMS (code already avoids similar on FreeBSD)

[Jay K <jay dot krell at cornell dot edu>]

VMS decc$types.h:

??? typedef unsigned int __size_t;

but with GCC 4.5.0 this preprocesses as:

??? typedef unsigned int ;
??? 
and there are ensuing errors e.g. when compiling gcc/libiberty/regex.c

probably because of:

/usr/local/lib/gcc/alpha-dec-vms/4_5_0/include/stddef.h (it does get included)
#if defined (__FreeBSD__) && (__FreeBSD__>= 5)
/* __size_t is a typedef on FreeBSD 5!, must not trash it. */
#else
#define __size_t
#endif

presumably should be more like:

#if (defined (__FreeBSD__) && (__FreeBSD__>= 5)) || defined(__vms)
/* __size_t is a typedef on FreeBSD 5 and VMS, must not trash it! */
#else
#define __size_t
#endif


That gets further, then hits 


src/gcc-4.5.0/libiberty/regex.c: In function 'byte_insert_op2':
/src/gcc-4.5.0/libiberty/regex.c:4279:1: error: unrecognizable insn:
(insn 62 61 63 5 /src/gcc-4.5.0/libiberty/regex.c:4276 (set (reg:DI 135)
??????? (plus:SI (subreg/s:SI (reg/v/f:DI 109 [ pfrom ]) 0)
??????????? (const_int 5 [0x5]))) -1 (nil))
/src/gcc-4.5.0/libiberty/regex.c:4279:1: internal compiler error: in extract_insn, at recog.c:2103
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make: *** [regex.o] Error 1


?- Jay