This commit updates the get Zephyr settings functions to be able to
handle settings if those settings are expressed using a generator
expression.
As example, zephyr_get_include_directories_for_lang(...) would prefix
each include property of zephyr_interface with `-I`, like this:
Property: include;include/generated;lib/libc/minimal/include
becomes: `-Iinclude -Iinclude/generated -Ilib/libc/minimal/include`
But if the property contains a generator expression:
Property: include;$<TARGET_PROPERTY:compiler,some_include>
becomes: -Iinclude -I$<TARGET_PROPERTY:compiler,some_include>
and in case that property is a list, this results in:
`-Iinclude -Iinclude/list_item1;include/list_item2;include/list_itemN`
and thus breaking the build.
This is fixed by using `$<JOIN:<list>>` expression instead, which
ensures all list item, regardless of provided as simple list or through
the usage another generator expression, will always expand correctly.
Functions updated in the commit:
- zephyr_get_include_directories_for_lang
- zephyr_get_system_include_directories_for_lang
- zephyr_get_compile_definitions_for_lang
- zephyr_get_compile_options_for_lang
The sample `application_development/external_lib` has been updated
according to those changes.
Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
b94ce67899