Kconfig bug (optional choice deselected by following option)

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Hi all,

I have found weird feature of Kconfig.
If I misused something, please let me know - I found at least one place where the same error occurs.

Let's consider the following Kconfig (you can put it anywhere in the source tree):
<-------------- copy ----------------->
menu "Testmenu"
choice
prompt "Problem to solve"
optional
default n
help
Solve one of great world problems

config SOLVE_HUNGER
bool "Hunger"

config SOLVE_WARS
bool "Wars"

config CURE_CANCER
bool "Cancer"

endchoice

config TREES
default n
bool "Plant trees in garden"
endmenu

config BLAH
default n
bool "Totally unrelated option"

<------------- paste ------------------->

Now, select HUNGER important problem to solve; Warning - select it with space, _not_ enter + selection from list; Then select either TREES or BLAH.

Weird thing is - SOLVE_HUNGER is unselected.

It doesn't happen when you select (anything) by entering selection menu (i.e. enter). Even if you deselect option and then select it with space.

It happens both in menuconfig and nconfig.

It happens both in recent U-Boot b57843e6 and Linux kernel ece62678.

Unfortunately my knowledge of Kconfig is very limited so your help would be appreciated.

Best Regards,
Mateusz
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Hi Mateusz,
(CCing linux-kbuild, which I think the best place to discuss this topic)

I think "default n" in the choice entry is weird
because the choice is not boolean.

Without it, the weird thing you saw did not happen on my box.

Anyway, I'd like Kconfig to say something if it is really a syntax error.

I hope comments from Kconfig experts.

2016-01-17 20:39 GMT+09:00 Mateusz Kulikowski <[email protected]>:

Quoted 60 lines

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Hi all,

I have found weird feature of Kconfig.
If I misused something, please let me know - I found at least one place where the same error occurs.

Let's consider the following Kconfig (you can put it anywhere in the source tree):
<-------------- copy ----------------->
menu "Testmenu"
choice
prompt "Problem to solve"
optional
default n
help
Solve one of great world problems

config SOLVE_HUNGER
bool "Hunger"

config SOLVE_WARS
bool "Wars"

config CURE_CANCER
bool "Cancer"

endchoice

config TREES
default n
bool "Plant trees in garden"
endmenu

config BLAH
default n
bool "Totally unrelated option"

<------------- paste ------------------->

Now, select HUNGER important problem to solve; Warning - select it with space, _not_ enter + selection from list; Then select either TREES or BLAH.

Weird thing is - SOLVE_HUNGER is unselected.

It doesn't happen when you select (anything) by entering selection menu (i.e. enter). Even if you deselect option and then select it with space.

It happens both in menuconfig and nconfig.

It happens both in recent U-Boot b57843e6 and Linux kernel ece62678.

Unfortunately my knowledge of Kconfig is very limited so your help would be appreciated.

Best Regards,
Mateusz
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Quoted 12 lines

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--
Best Regards
Masahiro Yamada

Hi Mateusz,
(CCing linux-kbuild, which I think the best place to discuss this topic)

I think "default n" in the choice entry is weird
because the choice is not boolean.

Without it, the weird thing you saw did not happen on my box.

Anyway, I'd like Kconfig to say something if it is really a syntax error.

I hope comments from Kconfig experts.

2016-01-17 20:39 GMT+09:00 Mateusz Kulikowski <[email protected]>:
Hi all,

I have found weird feature of Kconfig.
If I misused something, please let me know - I found at least one place where the same error occurs.

Let's consider the following Kconfig (you can put it anywhere in the source tree):
<-------------- copy ----------------->
menu "Testmenu"
choice
prompt "Problem to solve"
optional
default n
help
Solve one of great world problems

config SOLVE_HUNGER
bool "Hunger"

config SOLVE_WARS
bool "Wars"

config CURE_CANCER
bool "Cancer"

endchoice

config TREES
default n
bool "Plant trees in garden"
endmenu

config BLAH
default n
bool "Totally unrelated option"

<------------- paste ------------------->

Now, select HUNGER important problem to solve; Warning - select it with space, _not_ enter + selection from list; Then select either TREES or BLAH.

Weird thing is - SOLVE_HUNGER is unselected.

It doesn't happen when you select (anything) by entering selection menu (i.e. enter). Even if you deselect option and then select it with space.

It happens both in menuconfig and nconfig.

It happens both in recent U-Boot b57843e6 and Linux kernel ece62678.

Unfortunately my knowledge of Kconfig is very limited so your help would be appreciated.

Best Regards,
Mateusz

Quoted 4 lines

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