WIP: new variant resolving / rendering #1122
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This is an attempt to separate things better into "stage 1" and "stage 2" rendering.
Stage 1:
Get all used variables from Jinja and conditional expressions and then render these out for all combinations that are found based on the variant config. This already creates a number of different combinations.
Stage 2:
From the rendered recipes (no more Jinja, conditionals) we need to get all the
requirements
at build/link time and create additional variants.Stage 3:
Topologically sort and de-duplicate outputs (with multiple outputs, these renders might create duplicate outputs, for example if you have a C library and multiple variants for Python bindings).