linux/scripts/kconfig/tests/err_recursive_dep/Kconfig

# SPDX-License-Identifier: GPL-2.0

# depends on itself

config A
	bool "A"
	depends on A

# select itself

config B
	bool
	select B

# depends on each other

config C1
	bool "C1"
	depends on C2

config C2
	bool "C2"
	depends on C1

# depends on and select

config D1
	bool "D1"
	depends on D2
	select D2

config D2
	bool

# depends on and imply

config E1
	bool "E1"
	depends on E2
	imply E2

config E2
	bool "E2"

# property

config F1
	bool "F1"
	default F2

config F2
	bool "F2"
	depends on F1

# menu

menu "menu depending on its content"
	depends on G

config G
	bool "G"

endmenu
kconfig: report recursive dependency involving 'imply' Currently, Kconfig does not complain about the recursive dependency where 'imply' keywords are involved. [Test Code] config A bool "a" config B bool "b" imply A depends on A In the code above, Kconfig cannot calculate the symbol values correctly due to the circular dependency. For example, allyesconfig followed by syncconfig results in an odd behavior because CONFIG_B becomes visible in syncconfig. $ make allyesconfig scripts/kconfig/conf --allyesconfig Kconfig # # configuration written to .config # $ cat .config # # Automatically generated file; DO NOT EDIT. # Main menu # CONFIG_A=y $ make syncconfig scripts/kconfig/conf --syncconfig Kconfig * * Restart config... * * * Main menu * a (A) [Y/n/?] y b (B) [N/y/?] (NEW) To detect this correctly, sym_check_expr_deps() should recurse to not only sym->rev_dep.expr but also sym->implied.expr . At this moment, sym_check_print_recursive() cannot distinguish 'select' and 'imply' since it does not know the precise context where the recursive dependency has been hit. This will be solved by the next commit. In fact, even the document and the unit-test are confused. Using 'imply' does not solve recursive dependency since 'imply' addresses the unmet direct dependency, which 'select' could cause. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Tested-by: Dirk Gouders <dirk@gouders.net> 2018-08-15 14:59:44 +09:00			`# SPDX-License-Identifier: GPL-2.0`

kconfig: tests: test if recursive dependencies are detected Recursive dependency should be detected and warned. Test this. This indirectly tests the line number increments. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Ulf Magnusson <ulfalizer@gmail.com> 2018-03-13 18:12:11 +09:00			`# depends on itself`

			`config A`
			`bool "A"`
			`depends on A`

			`# select itself`

			`config B`
			`bool`
			`select B`

			`# depends on each other`

			`config C1`
			`bool "C1"`
			`depends on C2`

			`config C2`
			`bool "C2"`
			`depends on C1`

			`# depends on and select`

			`config D1`
			`bool "D1"`
			`depends on D2`
			`select D2`

			`config D2`
			`bool`

			`# depends on and imply`

			`config E1`
			`bool "E1"`
			`depends on E2`
			`imply E2`

			`config E2`
			`bool "E2"`

			`# property`

			`config F1`
			`bool "F1"`
			`default F2`

			`config F2`
			`bool "F2"`
			`depends on F1`

			`# menu`

			`menu "menu depending on its content"`
			`depends on G`

			`config G`
			`bool "G"`

			`endmenu`