Re: conditional statements

[Oleksandr Gavenko]

On 2010.04.29 12:55, Payal wrote:
> Hello,
> Need some help in understaning below, please.
>
> 1. cat Makefile
> .PHONY : all
> ifndef $(one)
>          one := 1
> endif
> all :
>          @echo $(one)
>
> $ make
>
> $
> Why does it not print 1?
Don't know, I got "1" and always use ifndef pattern in my Makefiles.

> 2. I am unable to find a real simple example for understanding of $(if ...).
> Can someone please give one?
I use $(if ...) in such case:

cmd ... | tee .log

save output into log. To control when use loggin I define:

LOG_CMD = $(if $(VERBOUSE), | tee $(LOG))

and in command wrote:

a: b
    cmd -o $@ $< $(LOG_CMD)

--
С уважением, Александр Гавенко.