# linux.mk
#
# Goals:
#   Configure an environment that will allow Taulabs GCS and firmware to be built
#   on a Linux system. The environment will support the current versions of Qt SDK
#   and the ARM toolchain installed to either the Taulabs/tools directory, their
#   respective default installation locations, or made available on the system path.

# First look for `python3`. If `which` doesn't return a null value, then it exists!
ifneq ($(shell which python3), "")
    PYTHON:=python3
else
    # Get Python version, separate major/minor/patch, then put into wordlist
    PYTHON_VERSION_=$(wordlist 2,4,$(subst ., ,$(shell python -V 2>&1)))
    # Get major version from aforementioned list
    PYTHON_MAJOR_VERSION_=$(word 1,$(PYTHON_VERSION_))
    # Just in case Make has some weird scope stuff
    PYTHON=0
    # If the major Python version is the one we want..
    ifeq ($(PYTHON_MAJOR_VERSION_),3)
	    # Then we can just use the normal Python executable
        PYTHON:=python
    else
	    # And if it doesn't exist, let's use the default Python, and warn the user.
	    # PYTHON NOT FOUND.
        PYTHON:=python
        echo "Python not found."
    endif
endif

export PYTHON