From 67ac07b1a4b0aae9021d6e7ce1273710694fdd6f Mon Sep 17 00:00:00 2001
From: flykhan <liubo666666@outlook.com>
Date: Wed, 12 Jul 2023 11:41:46 +0800
Subject: [PATCH] =?UTF-8?q?day8=20coding:=20=E5=8A=A8=E6=80=81=E5=BA=93?=
 =?UTF-8?q?=E7=9A=84=E7=94=9F=E6=88=90=E5=92=8C=E4=BD=BF=E7=94=A8?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 day8/d2/README.md        |  18 ++++++++++++++++++
 day8/d2/my.c             |  11 +++++++++++
 day8/d2/my/includes/my.h |   9 +++++++++
 day8/d2/my/libs/libmy.so | Bin 0 -> 7896 bytes
 day8/d2/test.c           |   9 +++++++++
 5 files changed, 47 insertions(+)
 create mode 100644 day8/d2/README.md
 create mode 100644 day8/d2/my.c
 create mode 100644 day8/d2/my/includes/my.h
 create mode 100755 day8/d2/my/libs/libmy.so
 create mode 100644 day8/d2/test.c

diff --git a/day8/d2/README.md b/day8/d2/README.md
new file mode 100644
index 0000000..e40b1c1
--- /dev/null
+++ b/day8/d2/README.md
@@ -0,0 +1,18 @@
+### 动态库 (libxx.so) 生成
+
+```bash
+# 生成 xx 工具的动态库 xx.c ---> libxx.so
+gcc -shared xx.c -o libxx.so
+```
+
+### 静态库的使用
+
+```bash
+# test.c 使用 libxx.so 编译生成可执行文件 test 的方式
+gcc test.c libxx.so -o test
+# 运行时需要将库文件的目录 (./是当前路径) 添加到 LD_LIBRARY_PATH 环境变量中
+export LD_LIBRARY_PATH=./my/libs:$LD_LIBRARY_PATH
+# 或者将生成的库文件和相关头文件添加 (或使用软连接) 到系统的库目录 (/usr/lib) 及系统的头文件目录 (/usr/include)中
+# 以 root 进入 /usr/lib 目录，然后创建软连接
+ln -s /动态库目录.../libxx.so .
+```
diff --git a/day8/d2/my.c b/day8/d2/my.c
new file mode 100644
index 0000000..044dcb9
--- /dev/null
+++ b/day8/d2/my.c
@@ -0,0 +1,11 @@
+#include "./my/includes/my.h"
+
+int sum(int a, int b)
+{
+    return a + b;
+}
+
+int sub(int a, int b)
+{
+    return a - b;
+}
\ No newline at end of file
diff --git a/day8/d2/my/includes/my.h b/day8/d2/my/includes/my.h
new file mode 100644
index 0000000..26ce97f
--- /dev/null
+++ b/day8/d2/my/includes/my.h
@@ -0,0 +1,9 @@
+#ifndef __MY_H__
+#define __MY_H__
+
+#include <stdio.h>
+
+int sum(int, int);
+int sub(int, int);
+
+#endif
\ No newline at end of file
diff --git a/day8/d2/my/libs/libmy.so b/day8/d2/my/libs/libmy.so
new file mode 100755
index 0000000000000000000000000000000000000000..b03c4803ed6356d472a304901d19e53331720cd1
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diff --git a/day8/d2/test.c b/day8/d2/test.c
new file mode 100644
index 0000000..fe77231
--- /dev/null
+++ b/day8/d2/test.c
@@ -0,0 +1,9 @@
+#include "./my/includes/my.h"
+
+int main()
+{
+    int a = 10, b = 20;
+    printf("10+20=%d\n", sum(a, b));
+    printf("20-10=%d\n", sub(b, a));
+    return 0;
+}
\ No newline at end of file