[LEDE-DEV] Dependency issues on custom packages and USE_MUSL visibility

[Yousong Zhou]

On 10 October 2016 at 04:03, Carlos Ferreira <carlosmf.pt at gmail.com> wrote:
> Hello!
> I'm having some issues regarding the implementation of new package
> options, due to their peculiar dependencies.
>
> I'm trying to implement a configuration option, which should exist
> only if the package libbz2 is selected. I understand that to do this,
> I should have something like this:
>
>     config new-option-with-libbz2-dependency
>         depends on PACKAGE_libbz2
>         bool "Optional support for libbz2."
>         default n
>
> Now, the thing is, the building system is not building libbz2 before
> the package, as a result of being a dependency, it is only hiding the
> option until libbz2 is selected in the menuconfig.
> Also, if I add:
>     select PACKAGE_libz2
> it will only select the package but not build it as a dependency.
>
> How can I force the compilation of libbz2 before the package is
> compiled, when my new option is selected?

Try using +new-option-with-libbz2-dependency:libbz2 . See
https://wiki.openwrt.org/doc/devel/packages#dependency_types and
package makefile of dnsmasq for details

>
>
> Also, I would like to know how can I use the USE_MUSL symbol to add
> values to the TARGET_LDFLAGS variable. The following example seems not
> to work:
>
> TARGET_LDFLAGS += \
>     $(if $(@USE_MUSL), -pthread -lrt,) \
>
>
> What am I doing wrong?

Check `CONFIG_USE_MUSL` in Makefile.  It's not the same as the those
in `DEPENDS` and mconf, though related.

                yousong

>
> --
>
> Carlos Miguel Ferreira
> Researcher at Telecommunications Institute
> Aveiro - Portugal
> Work E-mail - cmf at av.it.pt
> Skype & GTalk -> carlosmf.pt at gmail.com
> LinkedIn -> http://www.linkedin.com/in/carlosmferreira
>
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