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Add more comments about soong config variables

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Bug: 329208946
Test: N/A
Change-Id: I68a5e59bc095f5c23509993675f26ed903bcbc78
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Inseob Kim 2024-04-22 14:52:23 +09:00
parent 02c8618e1b
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README.md
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@ -463,18 +463,32 @@ soong_config_string_variable {
This example describes a new `acme_cc_defaults` module type that extends the
`cc_defaults` module type, with four additional conditionals based on variables
`board`, `feature`, `impl` and `width` which can affect properties `cflags` and
`srcs`. Additionally, each conditional will contain a `conditions_default`
property can affect `cflags` and `srcs` in the following conditions:
`srcs`. The four types of soong variables control properties in the following
ways.
* bool variable (e.g. `feature`): the variable is unspecified or not set to a true value
* bool variable (e.g. `feature`): Properties are applied if set to `true`.
* list variable (e.g. `impl`): (lists of strings properties only) Properties are
applied for each value in the list, using `%s` substitution. For example, if
the property is `["%s.cpp", "%s.h"]` and the list value is `foo bar`,
the result is `["foo.cpp", "foo.h", "bar.cpp", "bar.h"]`.
* value variable (e.g. `width`): (strings or lists of strings) The value are
directly substituted into properties using `%s`.
* string variable (e.g. `board`): Properties are applied only if they match the
variable's value.
Additionally, each conditional containing a `conditions_default` property can
affect `cflags` and `srcs` in the following conditions:
* bool variable (e.g. `feature`): the variable is unspecified or not set to
`true`
* list variable (e.g. `impl`): the variable is unspecified
* value variable (e.g. `width`): the variable is unspecified
* string variable (e.g. `board`): the variable is unspecified or the variable is set to a string unused in the
given module. For example, with `board`, if the `board`
conditional contains the properties `soc_a` and `conditions_default`, when
board=soc_b, the `cflags` and `srcs` values under `conditions_default` will be
used. To specify that no properties should be amended for `soc_b`, you can set
`soc_b: {},`.
* string variable (e.g. `board`): the variable is unspecified or the variable is
set to a string unused in the given module. For example, with `board`, if the
`board` conditional contains the properties `soc_a` and `conditions_default`,
when `board` is `soc_b`, the `cflags` and `srcs` values under
`conditions_default` is used. To specify that no properties should be amended
for `soc_b`, you can set `soc_b: {},`.
The values of the variables can be set from a product's `BoardConfig.mk` file:
```