Lecture 2 Makefile exercise

Lec2-makefile/Makefile

+CC = gcc
+CFLAGS = -O -std=gnu11
+LDLIBS = -lm
+
+default: out.txt
+	cat out.txt
+
+out.txt: hello
+	./hello > out.txt
+
+hello: hello.o
+	$(CC) -o hello hello.o $(LDLIBS)
+
+hello.o: hello.c
+	$(CC) $(CFLAGS) -c hello.c
+
+clean:
+	$(RM) -f hello.o hello out.txt
+
+test:
+	echo $(CC)
+	echo $(CDFLAGS)
+	echo $(LDLIB)
+	echo $(RM)

Lec2-makefile/hello.c

+#include<stdio.h>
+#include<math.h>
+
+int main() {
+	double x = sqrt(2.0);
+	printf("Hello, sqrt(2)=%g\n", x);
+return 0;
+}

Lec2-makefile/out.txt

+Hello, sqrt(2)=1.41421