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| author | Masahiro Yamada <masahiroy@kernel.org> | 2020-03-02 07:23:40 +0100 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-03-13 02:05:34 +0100 |
| commit | 3a9dd3ecb207b2cb8a4aabd12d20e43fa360b66d (patch) | |
| tree | 7586526ac545db8fae708e3ad928b7a0789ea312 /Documentation/kbuild | |
| parent | kconfig: allow symbols implied by y to become m (diff) | |
| download | linux-3a9dd3ecb207b2cb8a4aabd12d20e43fa360b66d.tar.xz linux-3a9dd3ecb207b2cb8a4aabd12d20e43fa360b66d.zip | |
kconfig: make 'imply' obey the direct dependency
The 'imply' statement may create unmet direct dependency when the
implied symbol depends on m.
[Test Code]
config FOO
tristate "foo"
imply BAZ
config BAZ
tristate "baz"
depends on BAR
config BAR
def_tristate m
config MODULES
def_bool y
option modules
If you set FOO=y, BAZ is also promoted to y, which results in the
following .config file:
CONFIG_FOO=y
CONFIG_BAZ=y
CONFIG_BAR=m
CONFIG_MODULES=y
This does not meet the dependency 'BAZ depends on BAR'.
Unlike 'select', what is worse, Kconfig never shows the
'WARNING: unmet direct dependencies detected for ...' for this case.
Because 'imply' is considered to be weaker than 'depends on', Kconfig
should take the direct dependency into account.
For clarification, describe this case in kconfig-language.rst too.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'Documentation/kbuild')
| -rw-r--r-- | Documentation/kbuild/kconfig-language.rst | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/Documentation/kbuild/kconfig-language.rst b/Documentation/kbuild/kconfig-language.rst index d4d988aea679..a1601ec3317b 100644 --- a/Documentation/kbuild/kconfig-language.rst +++ b/Documentation/kbuild/kconfig-language.rst @@ -159,11 +159,11 @@ applicable everywhere (see syntax). Given the following example:: config FOO - tristate + tristate "foo" imply BAZ config BAZ - tristate + tristate "baz" depends on BAR The following values are possible: @@ -174,6 +174,9 @@ applicable everywhere (see syntax). n y n N/m/y m y m M/y/n y y y Y/m/n + n m n N/m + m m m M/n + y m n M/n y n * N === === ============= ============== @@ -191,6 +194,14 @@ applicable everywhere (see syntax). ... } + Note: If the feature provided by BAZ is highly desirable for FOO, + FOO should imply not only BAZ, but also its dependency BAR:: + + config FOO + tristate "foo" + imply BAR + imply BAZ + - limiting menu display: "visible if" <expr> This attribute is only applicable to menu blocks, if the condition is |