[OE-core] RFC: FOO_subtract, the logical antidote to FOO_append.

[Manuel Bessler]

Just a few minutes ago I was wondering if such a feature did exist...

I ran into a situation where I wanted to remove something from a .bbappend
that is added to a variable using VARIABLE_append = "this and that"


Manuel
On Tue, May 15, 2012 at 3:01 PM, Peter Seebach
<peter.seebach at windriver.com> wrote:
> There's a few cases where something is a huge list of space-separated
> things, and it is desireable to remove one.  The example currently
> afflicting me is DISTRO_FEATURES_LIBC_DEFAULT; I want to end up with
> the distro features including all but one of the words in it.
>
> It seems to me that a counterpart to _append would make sense.  Here
> is my basic idea:
>
> FOO_subtract = "..."
>
> means that, when you expand FOO:
>
> 1. Fully expand it.
> 2. Fully expand FOO_subtract.
> 3. Remove any words in FOO_subtract from FOO.
> 4. Yield the result.
>
> The rationale is that the semantics of things where we're using _append
> seem to be consistently of the form "this is a space-separated set",
> and being able to remove things from a set would be Super Handy.
>
> So I'm proposing the semantics for consideration, and if people like
> them, I will go try to implement it in my Copious Free Time.
>
> -s
> --
> Listen, get this.  Nobody with a good compiler needs to be justified.
>
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