[OpenWrt-Devel] How to handle multiple providers?

[Mats Karrman]

Thanks for your help!

I was actually working on something similar to your (2), using CONFIG_ 
variables but there were some trouble with the logic behind including 
the .config file and then also, all string options are exported with 
"quotes" around them and that messed up the DEPENDENCY declaration.

BR // Mats

On 2015-01-23 08:18, Alexandru Ardelean wrote:
> Well, you need to specifiy Ax in the DEPENDS section of B.
> Since there are 3 Ax, you can do it 2 ways:
>
> 1) Create Bx (x = 1-3) packages; B1 depends on A1, B2 depends on A2, 
> B3 depends on A3; so, if you select the correct Bx, the correct Ax 
> will also get built.
> You can also use build variants to keep Bx in a single Makefile; you 
> can check the  package/ncurses/Makefile for hints.
> The build variants does not seem too popular, but you can try it.
>
> 2) In the Makefile of B you can do a "dynamic" DEPENDS.
> Before the package definition (i.e.  define Package/B ) you can add a 
> A_DEPENDS variable.
> You can do something like:
> ifeq ($(A_DEPENDS),)
>    ifeq ($(CONFIG_A1),y)
>         A_DEPENDS := A1
>    endif
> endif
> ifeq ($(A_DEPENDS),)
>    ifeq ($(CONFIG_A2),y)
>         A_DEPENDS := A2
>    endif
> endif
> ifeq ($(A_DEPENDS),)
>    ifeq ($(CONFIG_A3),y)
>         A_DEPENDS := A3
>    endif
> endif
> A_DEPENDS should equal to either A1, A2 or A3, if either is selected. 
> Note that CONFIG_Ax is as defined in the .config file.
> Then
> define Package/B
>   DEPENDS:= ............ $(A_DEPENDS)
> endef
>
> If I look at this approach, it does what you asked for.
> But all in all, I would say there would be a cleaner approach if Ax 
> and B are known.
>
> If the assumption would be that Ax are similar packages (or variants 
> of a base A), then I'd make a single package A, and define some 
> options to it.
> Based on those options A would be a variation of type Ax (x = 1 - 3).
> Then
> define Package/B
>   DEPENDS:= ............ A
> endef
>
> And you can configure A with whatever options you need.
>
>
> On Thu, Jan 22, 2015 at 8:34 PM, Mats Karrman <mats.dev.list at gmail.com 
> <mailto:mats.dev.list at gmail.com>> wrote:
>
>     Hi,
>
>     I'm struggling with a problem and I can't really get it to work as
>     I want.
>
>     Say you have 3 packages, A1, A2 and A3, that all provide the
>     include file "f.h".
>     I also have package B that build-time depends on "f.h".
>
>     I will enable either A1, A2 or A3 in the .config for a build but
>     how do I make
>     OpenWRT understand that it cannot build B until either of Ax is built?
>
>     I'd be ever so greatfull for some good hints on how to solve this.
>
>     (and oh, I'm on "Attitude-Adjustment")
>
>     Best regards,
>     Mats
>     _______________________________________________
>     openwrt-devel mailing list
>     openwrt-devel at lists.openwrt.org
>     <mailto:openwrt-devel at lists.openwrt.org>
>     https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
>
>

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