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#### 1.2.71 $SETC : Define and assign a value to a symbol

In MACPAS mode, this directive can be used to define compiler symbols. It is an alternative to the $DEFINE directive for macros. It is supported for compatibility with existing Mac OS Pascal compilers. It will define a symbol with a certain value (called a compiler variable expression).

The expression syntax is similar to expressions used in macros, but the expression must be evaluated at compile-time by the compiler. This means that only some basic arithmetic and logical operators can be used, and some extra possibilities such as the TRUE,FALSE and UNDEFINED operators:

{$SETC TARGET_CPU_PPC := NOT UNDEFINED CPUPOWERPC}
{$SETC TARGET_CPU_68K := NOT UNDEFINED CPUM68K}
{$SETC TARGET_CPU_X86 := NOT UNDEFINED CPUI386}
{$SETC TARGET_CPU_MIPS := FALSE}
{$SETC TARGET_OS_UNIX := (NOT UNDEFINED UNIX) AND (UNDEFINED DARWIN)}

The := assignment symbol may be replaced with the = symbol.

Note that this command works only in MACPAS mode, but independent of the -Sm command line option or {$MACRO } directive.

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