In addition to the ANSI-compliant, implementation-independent
  macros described in the HP C Language Reference Manual, The HP C
  compiler provides the following predefined macros:

  Additional Information (explode) :

• System Identification Macros
• Compiler Mode Macros
• Floating Point Macros
• RTL Standards Macros
• HIDE FORBIDDEN NAMES
• CC$gfloat
• DATE
• FILE
• LINE
• TIME