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Re: Target specified by an empty variable

From: Oleksandr Gavenko
Subject: Re: Target specified by an empty variable
Date: Mon, 17 May 2010 19:37:54 +0300
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100317 Thunderbird/3.0.4

On 2010.05.17 3:24, Glenn Morris wrote:
        @echo foo

My question is, if foo is empty, ie:

foo =

which means that the $(foo) rule has no target (?), is the resulting
Makefile valid and portable? It seems to work OK with GNU make, but I
am not sure if I can rely on that.

From info make:

   A "target" is usually the name of a file that is generated by a
program; examples of targets are executable or object files.  A target
can also be the name of an action to carry out, such as `clean'.

So if strlen > 0 - it OK, otherwise GNU Make developer nothing guarantee.

If you run make with empty string target you get error:

 $ LANG=C make ""
make: *** empty string invalid as file name.  Stop.

It likely empty string target incorrect and you
must rewrote build scripts to avoid empty string in target.

С уважением, Александр Гавенко.

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