[C/C++]Two different ways of using include

kikook

于 2019-07-15 00:58:21 发布

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分类专栏： C c++编程语言手记

本文链接：https://blog.youkuaiyun.com/chenhanxuan1999/article/details/95937346

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博客内容为从Github笔记中提取的相关内容，链接为https://github.com/youhengchan/LearnMake/tree/master/Makefile_Notes/test3 ，涉及信息技术领域的代码笔记分享。

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"-I" is a parameter to anotate position of header files, format:

cc [options] [sources.cxx] -I path_of_directoris

In this sample(Makefile), we use "-I.", which indicate that we look for
 the header files in the current working diretory.

The search orders:(Depending on the way to include files: "" or <>)

<.h>: gcc/g++ look in following orders:
    1."-I path_of_directories" -> specified path got checked first
    2./usr/local/include
    3./usr/include
    4.cerr error

".h": gcc/g++ look in following orders:
    1.current working directory (where sources code being staged)
    2."-I path_of_directories" -> path_of_directories 
    3./usr/local/include
    4./usr/include
    5.cerr error

Extract from my Github notes:

https://github.com/youhengchan/LearnMake/tree/master/Makefile_Notes/test3