常用的 Makefile 自動變數

$@ is the name of the file being generated, and $< the first prerequisite (usually the source file). You can find a list of all these special variables in the GNU Make manual. For example, consider the following declaration: all: library.cpp main.cpp In this case: $@ evaluates to all $< evaluates to library.cpp $^ evaluates to library.cpp main.cpp ----------------------------------------------------------------------------- Automatic Variables For more details: https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html#Automatic-Variables $@ Target name (目標條件名), the value at the left side of the comma.  foo.o: foo.c      echo $@     Expected Result = foo.o $< The first prerequisite (第一條件名), the first value at the right side of the comma.  foo.o: foo.c      echo $<     Expected Result = foo.c $^ All the prerequisites (全個 list). The whole list of values at the right side of the comma. foo.o: food.c drinks.c life.c      echo $^     Expected Result = food.c drinks.c life.c