Some compiler directives and compiler options have the same effect (see the following table). However, compiler directives can be turned on and off throughout a program, while compiler options remain in effect for the whole compilation unless overridden by a compiler directive.
| Compiler directive | Equivalent command-line compiler option |
|---|---|
| DECLARE | /warn:declarations or /4Yd |
| NODECLARE | /warn:nodeclarations or /4Nd |
| DEFINE symbol | /define:symbol or /Dsymbol |
| FIXEDFORMLINESIZE:option | /extend_source[:option] or /4Loption |
| FREEFORM | /free or /nofixed, or /4Yf |
| NOFREEFORM | /nofree, /fixed, or /4Nf |
| INTEGER:option | /integer_size:option or /4Ioption |
| OBJCOMMENT | /libdir |
| PACK:option | /alignment[:option] or /Zpoption |
| REAL:option | /real_size:option or /4Roption |
| STRICT | /warn:stderrors with /stand:f90 or /4Ys |
| NOSTRICT | /4Ns |
Note that any of the compiler directive names above can be specified using the prefix !MS$; for example, !MS$NOSTRICT is allowed.
For rules on using compiler directives, see Syntax Rules for General Directives.