Makefile How to use the shell if judge

/********************************************************************* * Makefile How to use shell if judgment * Description: * For example, it may be necessary to determine the existence of files, folders in Makfile, use shell syntax * To output some information, and so on. * * 2017-8-21 Shenzhen Longhua gen Zengjianfeng ************************************************************* *******/First, reference documents:1. Test whether a directory exists inside a makefile https://Stackoverflow.com/questions/20763629/test-whether-a-directory-exists-inside-a-makefileSecond, the solution:ifA shell command, must beinchOne line, or is on multiple linesusingA backslash forLine extension.

Makefile How to use the shell if judge