Add a way to do static preprocessor analysis using unifdef, as a way of
figuring out what code is actually used in the build.
I have modified the unifdef tool as follows:
- O(1) algorithm for symbol lookup, instead of O(n)
- support for IS_ENABLED(), CONFIG_IS_ENABLED()
The first patch was sent upstream. The others are U-Boot-specific so I
have not submitted those.
Please get in touch if you would like the patches.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
