Programming Utilities Guide
Macros: Definition, Substitution, and Suffix Replacement
New Append Operator
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+=
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This is the new append operator that appends a SPACE followed by a word or words, onto the existing value of the macro.
Conditional Macro Definitions
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:=
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This is the conditional macro definitions operator that indicates a conditional (targetwise) macro definition. A makefile entry of the form:
target := macro = value
indicates that macro takes the indicated value while processing target and its dependencies.
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