local compiler directives

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Local directives may be used more then once in a unit or program.

Local compiler direvtives

• $A and $ALIGN determines the of alignment of data in records.
• $A1, $A2,$A4 and $A8 determines the of alignment of data in records. Has the same effect as the directive $PACKRECORDS.
• $B or $BOOLEVAL enables short-cut evaluation of boolean values.
• $C or $ASSERTIONS supports debugging.
• $BITPACKING enables bit-wise packing of records.
• $CALLING determines calling-convention of routines.
• $CHECKPOINTER checks validity of pointers.
• $CODEALIGN determines the code-aligning in memory.
• $COPERATORS enables usage of operatores similar to conventions in the C language.
• $DEFINE or $DEFINEC enables definition of own symbols.
• $EXTENDEDSYM ignored by compiler.
• $F ignored by compiler.
• $FPUTYPE compiles according to FPU type
• $GOTO enables Goto and Label
• $H or $LONGSTRINGS determines string type for reserved word string.
• $HPPEMIT ignored by compiler.
• $IMPLICITEXCEPTIONS helps to avoid memory leaks.
• $INLINE copies procedures to the place, where they have been called from.
• $INTERFACES determines interface type.
• $I or $IOCHECKS enables checking of input/output.
• $I or $INCLUDE includes file in compilation.
• $I or $INCLUDE included certein compiler information.
• $J or $WRITEABLECONST enables run-time assigning of values to typed constants.
• $L or $LINK inserts object file during linking.
• $LINKLIB inserts library during linking.
• $M or $TYPEINFO creates RTTI
• $MACRO enables usage of macros.
• $MINENUMSIZE for Delphi-compatibility, see $PACKENUM or $Z
• $MINFPCONSTPREC sets minimum accuracy of floating point operations.
• $NODEFINE ignored by compiler.
• $OBJECTCHECKS checks usage of pointer to self.
• $OPTIMIZATION switches on certain optimizations.
• $OUTPUT_FORMAT determines output format of object file.
• $PACKENUM or $Z enables packing of compiler enumerations.
• $PACKRECORDS determines alignment of records in memory.
• $PACKSET determines packing of sets.
• $POP recreates saved compiler settings.
• $PUSH saves current compiler settings.
• $OVERFLOWCHECKS checkes integer variables for overflow.
• $R or $RANGECHECKS checks overflow of index in compound variables.
• $R or $RESOURCE inserts resource file.
• $STATIC enable usage of the reserved word static.
• $T or $TYPEDADDRESS determines, if the address operator @ delivers a typed or untyped pointer.
• $UNDEF undefines symbol.
• $V or $VARSTRINGCHECKS enables checking of assignments to string variables.
• $W or $STACKFRAMES determines conditions for the creation of stack frames.
• $WAIT waits with execution until the enter key has been pressed.

Conditional compilation

• $ELSE defines alternative path in conditional compilation.
• $ELSEIF defines alternative and new branch conditional compilation.
• $ENDIF defines end of conditional compilation.
• $IF Begin of conditional compilation.
• $IFDEF Begin of conditional compilation.
• $IFNDEF Begin of conditional compilation.
• $IFOPT Begin of conditional compilation.

Self-defined compiler warnings, messages and hints

• $ERROR display a self-defined error message.
• $FATAL display a self-defined fatal error message.
• $HINT displays a self-defined hint.
• $HINTS enables self-defined hints.
• $INFO display a self-defined information message.
• $MESSAGE creates a self-defined information message.
• $NOTE creates a self-defined note.
• $NOTES enables the creation of self-defined notes.
• $STOP display a self-defined fatal error message.
• $WARNING creates a self-defined warning.
• $WARNINGS enables self-defined warnings.

Local compiler direvtives for x86 processors only

• $ASMMODE assembler mode.
• $I386_XXX determines the assembler format.
• $MMX enables optimizations for MMX processores.
• $SATURATION Enables saturation (protection from memory-overflow) for MMX processores.
• $MAXFPUREGISTERS determines the maximum number of floating-points registers to use.

Local compiler direvtives for Darwin-based operating systems only

• $LINKFRAMEWORK inserts Framework.

Local compiler direvtives for MacPas mode only

The following directives are supported for compatibility with existing Pascal compilers for Mac OS:

• $A and $ALIGN determines the alignment of data in records.
• $ERRORC returns an error message.
• $Q or $OV monitor overflow of integer variables.

Symbols

• $DEFINEC enables definition of own symbols.
• $SETC defines and assigns a symbol.
• $UNDEFC undefines and unassigns a symbol.