[Buildroot] [PATCH-FOR-NEXT v1 3/6] pkgconf: add host-pkg-config wrapper

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, All,

On 2018-02-25 21:38 +0100, Thomas De Schampheleire spake thusly:
[--SNIP--]
> For reference, here is my mail:
> http://lists.busybox.net/pipermail/buildroot/2018-February/213629.html
> 
> I think you misunderstood my question/proposal: what I'd need is a
> unique path to the cross tools (gcc, ...) that does _not_ contain the
> tuple anywhere in it (or is reachable via a symlink that does not
> contain the tuple).
> Where I wrote 'cross' in the example path:
>     $(HOST_DIR)/bin/cross/{gcc,gdb,nm,readelf}
> I really meant the literal string 'cross', not the tuple (the exact
> string is of course something that can be discussed)
> 
> The reason I need something like that is for scripts/build systems
> external to Buildroot. They do not know the tuple upfront, and would
> have to do tricks to determine it. All they typically know is a
> reference to the buildroot path and a defconfig name.

But then they can call buildroot to know the tuple:
    eval $(make -s printvars VARS=GNU_TARGET_NAME)

and then gain access to the tuple with ${GNU_TARGET_NAME}.

> So, for that use case, I do not need any changes to the PATH env
> variable. Just an extra shadow tree with symlinks to the necessary
> cross tools, but reachable without knowing the tuple.

I wonder if we would want to support this case, especially since we
can't have a sane way to keep it working.

What worries me is that by doing what you suggest, we would be diverging
*greatly* from established conventions, and any patch to packagees to
support that, would not be upstreamable...

Regards,
Yann E. MORIN.

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