makefile - Make: Redo some targets if configuration changes -


I want to re-execute some goals in the configuration changes.

Consider this example:

I have a configuration variable (which either reads from the environment variable or a config.local file): 

  CONF: = ...   
 Based on this variable CONF, I collect a header file like .com.hpp:  
  conf .hpp: buildConfHeader $ (CONF)   
 Now, of course, I want to recreate this header if the configuration variable changes, because otherwise the header will not reflect the new configuration . But how can I make it? The configuration variable is not connected to a file, as it can be read from environment variables.  
 Is there any way to get this?   
 
 
 If the configuration has changed through a macro or environment variable, then  make < There is no way for / code>.  
 You, however, use a goal that only updates the timestamp of  conf.hpp , which will always force it to rebuild:  
  conf.pp: confupdate buildConfHeader $ (CONF) confupdate: @touchconf.hpp   
 However, as I said,  conf.pp  always made , Which means that any goals that depend on him as well as need to be made again is to create a more friendly solution to make himself. Seamke or GNU autototals are good for this, except you sacrifice a lot of control over the makefile. You can also use makefile build scripts, but I would advise against it because there are tools available that will allow you to make one more easily.

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