On Tue, Oct 28, 2003 at 12:21:49PM +0900, Dominique DEUFF wrote:
>
> Hello,
>
> I have to rebuild a project with the makefile I join at the end.
> I obtain this error :
> makefile:71: *** Recursive variable `LIBS' references itself
> (eventually). Stop
>
> Does anyone know a solution to this ?
There are two types of assignments.
LIBS = file.a
Result in late evaluation. What is to the right of '=' is evaluated only
when LIBS is referenced. With late evaluation a variable cannot
reference itself - that the problem you see.
Late evaluation is required when for example using the following:
VAR = $@
What to realise is that the value of $@ differ with the context where the
variable is used - therefore late evaluation is required.
But most often this is not the case, so I generally prefer the second type
of assignment in my makefiles.
LIBS := file.a
Result in early evaluation. Here LIBS is immediately assigned the value of
file.a. Use this type of assignment and your problem is solved.
Sam
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