The following statements are extensions that can influence compilation:
/ASSUME = [NO]UNDERSCORE (Alpha only)
{ALL }
{[NO]BOUNDS }
/CHECK = {[NO]OVERFLOW }
{[NO]UNDERFLOW }
{NONE }
/NOCHECK
{BIG_ENDIAN }
{CRAY }
{FDX }
{FGX }
/CONVERT = {IBM }
{LITTLE_ENDIAN }
{NATIVE }
{VAXD }
{VAXG }
/[NO]EXTEND_SOURCE
/[NO]F77
{D_FLOAT (VMS only) }
/FLOAT = {G_FLOAT (VMS only) }
{IEEE_FLOAT }
/[NO]G_FLOATING (VMS only)
/[NO]I4
/[NO]RECURSIVE