If `ARDMK_DIR` is not defined, then it is assumed to be the directory
where `Arduino.mk` or `chipKIT.mk` is present.
Since this assumption is made, `ARDMK_DIR` will always be set, whether
the user has explicitly set it or not. Therefore checking whether
`ARDMK_DIR` is not set is unnecessary. This commit removes these
unnecessary checks.
When support for ChipKit was added recently (issue #98) it broke the way
ARDMK_PATH and ARDMK_DIR were handled, if the package was installed
through package. It was only working if you have done a git checkout.
This commit fixes it, but searching for `Common.mk` both in
`ARDMK_DIR/arduino-mk` and `ARDMK_DIR/` directories.
Fix#110
It should be possible to use the Makefile without ever running the
Arduino or chipKIT IDE. This change only looks for the preferences file
if the sketchbook path is not defined, and even then, will use the
default skethbook path if the preferences file is unavailable.
This commit modifies a few things in Arduino.mk to be able to support
overriding the necessary configuration options to support the chipKIT build,
and also includes an example sketch configured to build for the Max32 platform.
In addition the following changes were done as well
- Control C standard with a CFLAGS_STD flag, GNU99 by default.
- Duplicate show_config_variable in each sub-makefile.
- Remove redundant output of ARDUINO_PREFERENCES_PATH from config table.
- Defer Priting ARDMK_DIR until Arduino.mk.
- Define names of compiler tools earlier to use for path checking.
Duplicating show_config_variable is unfortunate because the code is duplicated,
but I don't see a good way around it since we need to dupliacate the check
for ARDMK_DIR before we can find Common.mk.
Fix#98
