Sync betaflight to Gitea

mk/macosx.mk

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+# macosx.mk
+#
+# Goals:
+#   Configure an environment that will allow Taulabs GCS and firmware to be built
+#   on a Mac OSX system. The environment will support the current version of the
+#   ARM toolchain installed to either their respective default installation
+#   locations, the tools directory 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