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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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Setting all tristate choice symbols to 'm' is enough to always do the
right thing in practice. It has no effect for bool choice symbols (since
'm' will be ignored), but forces symbols in m-mode choices to 'm'.
'm' will also be ignored for tristate choice symbols in choices in 'y'
mode, because tristate is automagically converted to bool there.
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No longer used after the tool helpers were added.
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Removes repeated KCONFIG_CONFIG boilerplate.
Also make allyesconfig use KCONFIG_CONFIG when writing (oversight), and
document the sys.exit() behavior for standard_kconfig().
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standard_kconfig() gets the top-level Kconfig file from the first
command-line argument, defaulting to "Kconfig". This removes some
boilerplate from tools.
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Move to the root, simplify a bit, provide an entry point function (for
setuptools's entry_points).
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