Expands to the external name of blank common on the computer in use. This is used in declaring an external structure in C that overlays the FORTRAN blank common block.

F77_BLANK_COMMON

F77_BLANK_COMMON

will expand as follows:

All Unix	_BLNK__
VAX/VMS:	$BLANK

extern struct { int i,j,k;} F77_BLANK_COMMON;

declares an external structure to use the same storage as the FORTRAN blank common.

F77_BLANK_COMMON.i

refers to component i of the above structure.