How to have make targets for separate debug and release build directories?

One option is to have specific targets in the subdirectories for each build type. So if you do a "make all" at the top level, it looks at COMPILETYPE and invokes "make all-debug" or "make all-release" as appropriate.

If you are disciplined in your Makefiles about the use of your $(COMPILETYPE) variable to reference the appropriate build directory in all your rules, from rules that generate object files, to rules for clean/dist/etc, you should be fine.

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