tree 350cf3a65fcf8eed7a0f43e4635ba357e93f497e
parent 3df79ae7175a9a02c6df4d2b63796d8b3c18efc3
author Boyan Karatotev <boyan.karatotev@arm.com> 1745915532 +0100
committer Boyan Karatotev <boyan.karatotev@arm.com> 1752737552 +0100

refactor(build): use a standard rule to run the preprocessor

There are a few, functionally identical, ways to call the preprocessor
on a non-C file, depending on the file. They differ in subtle, not
entirely correct, ways - one is missing a dependency to the makefiles,
another generates its .d inline, and the prints are different. That has
resulted in platforms reimplementing this functionality, making the
build brittle - a change to the overall build system doesn't propagate.
So add a MAKE_PRE macro that will make a rule with all the bells and
whistles to run the preprocessor on an arbitrary file.

This patch converts the arm platforms' cot_descriptors DTS rules. The
files are renamed to fit with the build rule and all extra flags are
dropped. Those flags are only necessary for building BL2 c files, which
will be passed to the output C file. Only the DTS flags are needed for
the preprocessing step, which will be passed automatically.

Change-Id: I3c1cc0ecf93b87d828f868214928c1bc9bcb5758
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>