Hi,
On 07/01/12 18:24, Shea Levy wrote:
> Fairly frequently (especially when trying to get packages to build on
> non-Linux platforms without affecting the build for Linux), I find
> myself wishing for easier syntax for conditionally-existent attributes.
> Right now, we have to do something like
>
> {
> a = 1;
> } // (if condition then { b = 2; } else {})
I've been thinking about a special ‘ignore’ value:
derivation {
CFLAGS = if system == "i686-darwin" then "bla" else ignore;
}
This value would be like ‘null’, except that if a derivation attribute evaluates
to ‘ignore’, it wouldn't be added to the environment of the builder.
--
Eelco Dolstra | http://www.st.ewi.tudelft.nl/~dolstra/
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