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U-Boot has a ton of definition locations for some symbols, causing a lot
of redundant work when iterating over Kconfig.defined_syms in
_build_dep(). Iterate over set(Kconfig.defined_syms) instead, wherever
possible.
This speeds up the U-Boot parsing time from 4 seconds to 0.6 seconds on
my machine.
Also update the bundled tools to iterate over set(Kconfig.defined_syms).
The performance loss is negligible even for projects that don't use
multiple definition locations.
Update the documentation to clarify that symbols/choices defined in
multiple locations appear multiple times in Kconfig.defined_syms/choices
as well.
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We can rely on set_value() being a no-op when setting non-bool/tristate
symbols to 0/1/2 (due to those values being invalid for other types).
Remove some long duplicated comments too.
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This environment variable was inherited from the C tools.
kconfiglib.standard_config_filename() looks at it.
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Everything's ISC.
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Verified to produce identical output to 'make allmodconfig', for all
arches.
Will be packaged.
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