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Target specified by an empty variable

From: Glenn Morris
Subject: Target specified by an empty variable
Date: Sun, 16 May 2010 20:24:54 -0400


I have a Makefile that looks something like this:

all: go

foo = something

go : go.c $(foo)
        gcc -o go go.c

        @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.

The actual Makefile is generated by autoconf, and $foo is only
non-empty on certain platforms. I am wondering if that is OK, or if I
need to set $foo to some non-empty, dummy value.

TIA for any help.

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