Moved the BOARDS_TXT section and stop if BOARDS_TXT is not a file.

The section of Arduino.mk that calculates BOARDS_TXT was moved to just
before the point where it gets used for the first time (a call to
PARSE_BOARD). An error gets generated if BOARDS_TXT is not pointing to a
valid file, directly after the BOARDS_TXT calculation.

In addition, the PARSE_BOARD macro will now be bypassed if the
BOARDS_TXT variable points to a non-existing file. If a user makefile
uses PARSE_BOARD before including Arduino.mk, and the BOARDS_TXT is
wrong, the error will only be caught in the Arduino.mk file, which is
probably acceptable.

0 files changed, 0 insertions, 0 deletions