Compile for use with the debugger. 

"-g"

Global source program checking for consistency. 

"-Xlist[x]"

Check for subscripts out of range. 

"-C"

Undeclared variables--show a warning message. 

"-u"

Version ID--show ID along with name of each compiler pass. 

"-V"

Enable VMS Fortran `D' debugging statements with -vax=debug.

"-vax=v"

Allow debugging by dbx without .o files.

"-xs"