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On 23/03/12 12:02 PM, Ciaran McCreesh wrote:
> On Fri, 23 Mar 2012 11:58:47 -0400 Mike Gilbert
> <floppym@g.o> wrote:
>>> oasis_src_compile() { oasis_src_compile_no_doc if has doc
>>> ${IUSE} && use doc; then ocaml setup.ml -doc || die fi }
>> 
>> This should probably call use_if_iuse from eutils.eclass, which 
>> handles IUSE="[+-]doc".
> 
> Actually, neither way works. The spec says:
> 
> Global variables must only contain invariant values 
> (see~\ref{sec:metadata-invariance}). If a global variable's value
> is invariant, it may have the value that would be generated at any 
> given point in the build sequence.
> 
> So you can't rely upon IUSE having the "merged" value in an
> eclass.
> 

I don't know if I follow this one or not.  When inheriting an eclass,
all entities within the eclass get merged into the ebuild.  As long as
there aren't any special conditional tricks being used to assign to
global variables like IUSE, it would still be invariant wouldn't it?

I think 'any point in the build sequence' is still
post-eclass-inheritance isn't it?



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