From: Eugeniu Rosca Date: Tue, 2 Aug 2016 22:40:34 +0000 (+0200) Subject: kconfig-language: improve menuconfig usage description X-Git-Tag: v4.9-rc1~133^2~82 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=cfd7c612baa61af61b2c57b7b8321adf2d1b5d90;p=linux.git kconfig-language: improve menuconfig usage description Improper menuconfig usage leads to empty menu entries. zconfdump() is able to reveal some real-life examples: - menuconfig VFIO_NOIOMMU - menuconfig RESET_CONTROLLER - menuconfig SND_ARM To avoid future occurrences of those, improve the menuconfig syntax description. Signed-off-by: Eugeniu Rosca Signed-off-by: Jonathan Corbet --- diff --git a/Documentation/kbuild/kconfig-language.txt b/Documentation/kbuild/kconfig-language.txt index db101857b2c9..069fcb3eef6e 100644 --- a/Documentation/kbuild/kconfig-language.txt +++ b/Documentation/kbuild/kconfig-language.txt @@ -274,7 +274,44 @@ menuconfig: This is similar to the simple config entry above, but it also gives a hint to front ends, that all suboptions should be displayed as a -separate list of options. +separate list of options. To make sure all the suboptions will really +show up under the menuconfig entry and not outside of it, every item +from the list must depend on the menuconfig symbol. +In practice, this is achieved by using one of the next two constructs: + +(1): +menuconfig M +if M + config C1 + config C2 +endif + +(2): +menuconfig M +config C1 + depends on M +config C2 + depends on M + +In the following examples (3) and (4), C1 and C2 still have the M +dependency, but will not appear under menuconfig M anymore, because +of C0, which doesn't depend on M: + +(3): +menuconfig M + config C0 +if M + config C1 + config C2 +endif + +(4): +menuconfig M +config C0 +config C1 + depends on M +config C2 + depends on M choices: