(make.info) Make Control Functions

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(make.info) Functions

 
 Functions That Control Make
 ===========================
 
    These functions control the way make runs.  Generally, they are used
 to provide information to the user of the makefile or to cause make to
 stop if some sort of environmental error is detected.
 
 `$(error TEXT...)'
      Generates a fatal error where the message is TEXT.  Note that the
      error is generated whenever this function is evaluated.  So, if
      you put it inside a command script or on the right side of a
      recursive variable assignment, it won't be evaluated until later.
      The TEXT will be expanded before the error is generated.
 
      For example,
 
           ifdef ERROR1
           $(error error is $(ERROR1))
           endif
 
      will generate a fatal error during the read of the makefile if the
      `make' variable `ERROR1' is defined.  Or,
 
           ERR = $(error found an error!)
           
           .PHONY: err
           err: ; $(ERR)
 
      will generate a fatal error while `make' is running, if the `err'
      target is invoked.
 
 `$(warning TEXT...)'
      This function works similarly to the `error' function, above,
      except that `make' doesn't exit.  Instead, TEXT is expanded and
      the resulting message is displayed, but processing of the makefile
      continues.
 
      The result of the expansion of this function is the empty string.
 

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(make.info) Functions