Menu
CC=g++ CFLAGS=-c -Wall LDFLAGS= SOURCES=main.cpp hello.cpp factorial.cpp OBJECTS=$(SOURCES:.cpp=.o) EXECUTABLE=hello all: $(SOURCES) $(EXECUTABLE) $(EXECUTABLE): $(OBJECTS) $(CC) $(LDFLAGS) $(OBJECTS) -o $@ .cpp.o: $(CC) $(CFLAGS) $< -o $@ What do the $@ and $< do exactly?
312
Inside actions we can use: $@ to represent the full target name of the current target $? returns the dependencies that are newer than the current target $* returns the text that corresponds to % in the target $< returns the name of the first dependency $^ returns the names of all the dependencies with space as the ...
This special significance of ' $ ' is why you must write ' $$ ' to have the effect of a single dollar sign in a file name or recipe. Variable references can be used in any context: targets, prerequisites, recipes, most directives, and new variable values.
Lion is the symbol of Make in India. This logo was inspired by the Ashoka Chakra, to represent India's success in all spheres. You can read about the Make In India – Initiatives, Aims, Advantages & Challenges in the given link.
$@ is the name of the target being generated, and $< the first prerequisite (usually a 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
115
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
