技巧：打印头文件搜索路径

src/index.md

@@ -3,6 +3,7 @@
 * [打印gcc执行的子命令](print-commands-only.md)
 * [打印优化级别的对应选项](print-level-options.md)
 * [打印彩色诊断信息](diagnostics-color.md)
+* [打印头文件搜索路径](print-header-search-dir.md)
 * [查看连接库的具体路径](print-file-name.md)
 
 # 预处理

src/print-header-search-dir.md

@@ -0,0 +1,26 @@
+# 打印头文件搜索路径
+
+## 例子
+
+	$ gcc -v foo.c
+	...
+	ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
+	ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../x86_64-linux-gnu/include"
+	#include "..." search starts here:
+	#include <...> search starts here:
+	 /usr/lib/gcc/x86_64-linux-gnu/4.6/include
+	 /usr/local/include
+	 /usr/lib/gcc/x86_64-linux-gnu/4.6/include-fixed
+	 /usr/include/x86_64-linux-gnu
+	 /usr/include
+	End of search list.
+	...
+
+## 技巧
+
+如上所示，使用`-v`选项可以打印出gcc搜索头文件的路径和顺序。当然，也可以使用`-###`选项
+
+## 贡献者
+
+xmj
+