General Compiler Directives

Compaq Fortran provides several general-purpose compiler directives to perform tasks during compilation. You do not need to specify a compiler option to enable general directives.

The following general compiler directives are available:

• ALIAS

  Specifies an alternate external name to be used when referring to external subprograms.

• ATTRIBUTES

  Specifies properties for data objects and procedures.

• DECLARE and NODECLARE

  Generates or disables warnings for variables that have been used but not declared.

• DEFINE and UNDEFINE

  Specifies a symbolic variable whose existence (or value) can be tested during conditional compilation.

• FIXEDFORMLINESIZE

  Sets the line length for fixed-form source code.

• FREEFORM and NOFREEFORM

  Specifies free-format or fixed-format source code.

• IDENT

  Specifies an identifier for an object module.

• IF and IF DEFINED

  Specifies a conditional compilation construct.

• INTEGER

  Specifies the default integer kind.

• IVDEP

  Assists the compiler's dependence analysis.

• MESSAGE

  Specifies a character string to be sent to the standard output device during the first compiler pass.

• OBJCOMMENT

  Specifies a library search path in an object file.

• OPTIONS

  Affects data alignment and warnings about data alignment.

• PACK

  Specifies the memory starting addresses of derived-type items.

• PSECT

  Modifies certain characteristics of a common block.

• REAL

  Specifies the default real kind.

• STRICT and NOSTRICT

  Disables or enables language features not found in the language standard specified on the command line (Fortran 95 or Fortran 90).

• TITLE and SUBTITLE

  Specifies a title or subtitle for a listing header.

• UNROLL

  Tells the compiler's optimizer how many times to unroll a DO loop.

The following sections describe:

• Syntax Rules for General Directives
• Equivalent Compiler Options