Makefile writing or skills

1. Transfer macro definitions

For example, add a debug macro and add it directly to cflags in makefile.

Cflags =-g-wall-ddebug

 

2. determine whether an environment variable definition exists. If no error exists, stop.

Ifndef sdk_path
$ (Warning)
$ (Error error: 'sdk _ path' not defined .)
Endif

3. Generate the environment variable file in makefile and use make SDK. env to generate this file. You can use source SDK. env to set the environment variable;

SDK. env:
@ Echo creating $ @...
@ Echo "#! /Bin/sh ">$ @
@ Echo "# source this script to compile your modules, create by command" >>$ @
@ Echo "# Make SDK. env app_name = app;" >>$ @
@ Echo "# Don't edit it" >> @
@ Echo "sdk_path = $ (shell PWD)" >> @
@ Echo "Export sdk_path" >> @
Chmod + x $ @

 

4. Put the compilation information into the file

SH/bash can make &> 1.txt
CSH/tcsh is make> & 1.txt