lib/hardwaremain.c: Hide preprocessor guards in header

The `location` member of `struct boot_state_callback` is conditionally
guarded depending on `CONFIG(DEBUG_BOOT_STATE)` using preprocessor. It
is probably intended to save some space when the `location` strings do
not get printed. However, directly using the `location` member without
any guards will cause a compile-time error. Plus, preprocessor-guarded
code gets nasty really quickly.

In order to minimise preprocessor usage, introduce the `bscb_location`
inline helper function, which transforms the compile-time error into a
link-time error. It is then possible to substitute preprocessor guards
with an ordinary C `if` statement.

Change-Id: I40b7f29f96ea96a5977b55760f0fcebf3a0df733
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55386
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

0 files changed, 0 insertions, 0 deletions