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Cross Compiler Macros

Explanation courtesy of Christophe Rhodes on IRC?, reformatted somewhat

DEFMACRO defines a host macro when seen by the host and a target macro when seen by the cross-compiler

SB!XC:DEFMACRO, on the other hand, defines a cross-compiler macro when seen by the host and a target macro when seen by the cross-compiler - i.e. defmacro and sb!xc:defmacro are the same to the cross-compiler

DEF!MACRO does some or all of these things as it judges appropriate, but DEF!MACRO is made up of DEFMACRO and SB!XC:DEFMACRO operations; these two are the fundamental ones to understand

Example:

DEF!STRUCT FOO => DEFSTRUCT FOO + SB-XC:DEFSTRUCT FOO

DEF!STRUCT SB-XC:FOO => DEFSTRUCT SB-XC:FOO + SB-XC:DEFSTRUCT FOO

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