1 # Select broken dependency issue 1 # Select broken dependency issue
2 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 # 3 #
4 # Test with: 4 # Test with:
5 # 5 #
6 # make KBUILD_KCONFIG=Documentation/kbuild/Kco 6 # make KBUILD_KCONFIG=Documentation/kbuild/Kconfig.select-break menuconfig
7 # 7 #
8 # kconfig will not complain and enable this la 8 # kconfig will not complain and enable this layout for configuration. This is
9 # currently a feature of kconfig, given select 9 # currently a feature of kconfig, given select was designed to be heavy handed.
10 # Kconfig currently does not check the list of 10 # Kconfig currently does not check the list of symbols listed on a symbol's
11 # "select" list, this is done on purpose to he 11 # "select" list, this is done on purpose to help load a set of known required
12 # symbols. Because of this use of select shoul 12 # symbols. Because of this use of select should be used with caution. An
13 # example of this issue is below. 13 # example of this issue is below.
14 # 14 #
15 # The option B and C are clearly contradicting 15 # The option B and C are clearly contradicting with respect to A.
16 # However, when A is set, C can be set as well 16 # However, when A is set, C can be set as well because Kconfig does not
17 # visit the dependencies of the select target 17 # visit the dependencies of the select target (in this case B). And since
18 # Kconfig does not visit the dependencies, it 18 # Kconfig does not visit the dependencies, it breaks the dependencies of B
19 # (!A). 19 # (!A).
20 20
21 mainmenu "Simple example to demo kconfig selec 21 mainmenu "Simple example to demo kconfig select broken dependency issue"
22 22
23 config A 23 config A
24 bool "CONFIG A" 24 bool "CONFIG A"
25 25
26 config B 26 config B
27 bool "CONFIG B" 27 bool "CONFIG B"
28 depends on !A 28 depends on !A
29 29
30 config C 30 config C
31 bool "CONFIG C" 31 bool "CONFIG C"
32 depends on A 32 depends on A
33 select B 33 select B
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