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[bug #47163] description of ifdef directive behavior

From: Manoj Srivastava
Subject: [bug #47163] description of ifdef directive behavior
Date: Mon, 15 Feb 2016 22:12:43 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.82 Safari/537.36


                 Summary: description of ifdef directive behavior
                 Project: make
            Submitted by: srivasta
            Submitted on: Mon 15 Feb 2016 04:12:42 PM CST
                Severity: 3 - Normal
              Item Group: Documentation
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 4.1
        Operating System: Any
           Fixed Release: None
           Triage Status: None




This was reported by a debian user. Please retain a CC to 
so that the Debian BTS has a copy of your input. 

The manual says:
  ifdef variable-name
     The ifdef form takes the name of a variable as its argument, not a
reference to a variable. The value of that variable has a non-empty value, the
text-if-true is effective; otherwise, the text-if-false, if any, is effective.
Variables that have never been defined have an empty value. The text
variable-name is expanded, so it could be a variable or function that expands
to the name of a variable.

The second sentence of the first paragraph has a grammar error, it looks like
it should read "If the value of that variable..."
 Also, "The value has a ... value" seems awkward.



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