add gcc makefile leaning

GCC/Calc/include/head.h

@@ -0,0 +1,6 @@
+#include <stdio.h>
+int add(int a, int b);
+int div(int a, int b);
+int mul(int a, int b);
+int sub(int a, int b);
+

GCC/Calc/main.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include "head.h"
+
+int main(void)
+{
+    int sum = add(2, 24);
+    printf("sum = %d\n", sum);
+    return 0;
+}

GCC/Calc/src/add.c

@@ -0,0 +1,6 @@
+#include "head.h"
+int add(int a, int b)
+{
+    int result = a + b;
+    return result;
+}

GCC/Calc/src/div.c

@@ -0,0 +1,7 @@
+#include"head.h"
+
+int div(int a, int b)
+{
+    int result = a / b;
+    return result;
+}

GCC/Calc/src/mul.c

@@ -0,0 +1,6 @@
+#include "head.h"
+int mul(int a, int b)
+{
+    int result = a * b; 
+    return result;
+}

GCC/Calc/src/sub.c

@@ -0,0 +1,6 @@
+#include "head.h"
+int sub(int a, int b)
+{
+    int result = a - b;
+    return result;
+}

MAKE/add.c

@@ -0,0 +1,6 @@
+#include "head.h"
+int add(int a, int b)
+{
+    int result = a + b;
+    return result;
+}

MAKE/div.c

@@ -0,0 +1,7 @@
+#include"head.h"
+
+int div(int a, int b)
+{
+    int result = a / b;
+    return result;
+}

MAKE/include/head.h

@@ -0,0 +1,6 @@
+#include <stdio.h>
+int add(int a, int b);
+int div(int a, int b);
+int mul(int a, int b);
+int sub(int a, int b);
+

MAKE/main.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include "head.h"
+
+int main(void)
+{
+    int sum = add(2, 24);
+    printf("sum = %d\n", sum);
+    return 0;
+}

MAKE/makefile

@@ -0,0 +1,22 @@
+#get all .c files
+SrcFiles=$(wildcard *.c)
+
+#all .c files -> .o files
+ObjFiles=$(patsubst %.c,%.o,$(SrcFiles)) 
+all:app app1
+# 目标文件的用法$(Var)
+app:$(ObjFiles)
+	gcc -o $@ -I ./include $(ObjFiles)
+#模式匹配规则，$@，$<这样的变量，只能在规则中出现
+app1:$(ObjFiles)
+	gcc -o $@ -I ./include $(ObjFiles)
+
+%.o:%.c
+	gcc -c $< -I ./include -o $@
+test:
+	@echo $(SrcFiles)
+	@echo $(ObjFiles)
+.PHONY:clean all
+clean:
+	-@rm -f *.o # 不显示信息
+	-@rm -f app app1

MAKE/makefile1

@@ -0,0 +1,3 @@
+app:main.c add.c sub.c div.c mul.c
+	gcc -o app -I ./include main.c add.c sub.c div.c mul.c
+

MAKE/makefile2

@@ -0,0 +1,16 @@
+# ObjFiles 定义目标文件
+ObjFiles=main.o add.o sub.o div.o mul.o
+# 目标文件的用法$(Var)
+app:$(ObjFiles)
+	gcc -o app -I ./include main.o add.o sub.o div.o mul.o
+main.o:main.c
+	gcc -c main.c -I ./include
+add.o:add.c
+	gcc -c add.c -I ./include
+sub.o:sub.c
+	gcc -c sub.c -I ./include
+mul.o:mul.c
+	gcc -c mul.c -I ./include
+div.o:div.c
+	gcc -c div.c -I ./include
+

MAKE/makefile4

@@ -0,0 +1,18 @@
+#get all .c files
+SrcFiles=$(wildcard *.c)
+
+#all .c files -> .o files
+ObjFiles=$(patsubst %.c,%.o,$(SrcFiles)) 
+
+# 目标文件的用法$(Var)
+app:$(ObjFiles)
+	gcc -o app -I ./include $(ObjFiles)
+#模式匹配规则，$@，$<这样的变量，只能在规则中出现
+%.o:%.c
+	gcc -c $< -I ./include -o $@
+test:
+	@echo $(SrcFiles)
+	@echo $(ObjFiles)
+clean:
+	-@rm -f *.o # 不显示信息
+	-@rm -f app

MAKE/mul.c

@@ -0,0 +1,6 @@
+#include "head.h"
+int mul(int a, int b)
+{
+    int result = a * b; 
+    return result;
+}

MAKE/sub.c

@@ -0,0 +1,6 @@
+#include "head.h"
+int sub(int a, int b)
+{
+    int result = a - b;
+    return result;
+}