This is output from `defines' version 4.1.1, from your buddies at Newtware!
Thu May 17 22:34:28 HKT 2012
Linux debian 2.0.6 #2 Sun Jul 14 18:49:25 PDT 1996 i686
cc = [lcc]

_POSIX_SOURCE	= 1 
__BASE_FILE__	= "/tmp/def303.c"
__DATE__	= "May 17 2012"
__ELF__	= 1 
__FILE__	= "/tmp/def303.c"
__IMMEDIATE_PREFIX__	= 
__INCLUDE_LEVEL__	= 0
__LCC__	= 1 
__LINE__	= 8744
__PTRDIFF_TYPE__	= int
__REGISTER_PREFIX__	= 
__SIZE_TYPE__	= unsigned int
__STDC_VERSION__	= 199409L
__STDC__	= 1 
__STRICT_ANSI__	= 1 
__TIME__	= "22:34:28"
__USER_LABEL_PREFIX__	= 
__VERSION__	= "2.7.2"
__WCHAR_TYPE__	= long int
__i386__	= 1 
__linux__	= 1 
__signed__	= signed 
__unix__	= 1 
i386	= 1 
linux	= 1 
unix	= 1 

Checking other possibilities; should already be listed above:
__DATE__	= "May 17 2012"
__FILE__	= "/tmp/def303.c"
__LINE__	= 25
__STDC__	= 1
__TIME__	= "22:34:28"

Sizes of basic variable types:
  sizeof(char)           = 8 bits
  sizeof(short)          = 16 bits
  sizeof(int)            = 32 bits
  sizeof(long)           = 32 bits
  sizeof(float)          = 32 bits
  sizeof(double)         = 64 bits
  sizeof(long double)    = 64 bits
  sizeof(char *)         = 32 bits
  sizeof(char (*)(char)) = 32 bits