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Bad oversight. Weak reverse dependencies (from imply) are not considered
if the direct dependencies of a symbol are not met (the
'if'/'depends on' dependencies from the symbol and its parents, taking
location into account if the symbol is defined in multiple places).
Caused a wrong value for the symbol FS_FAT in the U-Boot Kconfigs, where
'imply' is more heavily used compared to the kernel.
Add a new variable _direct_deps that corresponds to dir_dep from the C
implementation. Before 'imply', dir_dep was only used for a
'select'-related warning in the C implementation.
Add a bunch of tests to cover 'imply' semantics. Should be solid now.
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Was added upstream in 31847b67 (kconfig: allow use of relations other
than (in)equality). Completely unused (and undocumented) in the kernel
except for in DEBUG_UART_8250_WORD in arch/arm/Kconfig.debug:
depends on DEBUG_UART_8250_SHIFT >= 2
(That line was added before lt/gt support by the way, and assumed a
feature that wasn't there.)
This change (and the upstream one) also slightly changes how
(in)equality comparisons work, making e.g.
MY_HEX = 0x00037
evaluate to 'y' if MY_HEX is 0x37. Prior to this change, the strings
needed to match exactly.
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This is like a 'select' that only changes the default value of a symbol,
not limiting what values the user can set it to (with one exception: A
symbol implied to 'y' can't be set to 'm').
Symbol.get_implied_symbols() was added, corresponding to
Symbol.get_selected_symbols(), and Symbol.__str__() was extended to
print implied symbols and weak reverse dependencies. Weak reverse
dependencies are the 'imply' version of 'select's reverse dependencies.
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Also add tests for misc. other forms.
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