devicetree: add CONFIG_LEGACY_DEVICETREE_MACROS
This default-y option allows continued use of the legacy devicetree
macros.
There are no functional changes yet, but when this is default n,
old-style DT code won't build. At that point, adding any of these will
be a fix to keep old-style code working:
- "CONFIG_LEGACY_DEVICETREE_MACROS=y" to prj.conf
- "-- -DCONFIG_LEGACY_DEVICETREE_MACROS=y" to the west build command
- "-DCONFIG_LEGACY_DEVICETREE_MACROS=y" to the cmake command
This option can be changed to default n in time for the Zephyr 2.3
release. That will provide users of Zephyr 2.2 with a smooth migration
path to the new devicetree.h API after 2.3 is released, which
nonetheless will alert them immediately that something is wrong due to
build errors.
Unfortunately, __DEPRECATED_MACRO is not sufficient in all cases as a
warning to users. This is because, at least in GCC, macros defined
using __DEPRECATED_MACRO cannot be used in preprocessor lines like
"#if DT_SOME_LEGACY_MACRO".
Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
3 files changed
