Set up a basic submodule

makefile

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+#compiler settings reference
+#CC=gcc
+#CFLAGS+=-std=c17 -g -Wall -Werror -Wextra -Wpedantic -Wformat=2 -Wno-newline-eof
+#LIBS+=-lm
+#LDFLAGS+=
+
+#directories (override the build destination)
+export TOY_SOURCEDIR=source
+export TOY_REPLDIR=repl
+export TOY_OUTDIR=../out
+export TOY_OBJDIR=obj
+
+#targets
+all: Toy
+
+.PHONY: Toy
+Toy:
+	$(MAKE) -C Toy/source -k
+
+#util targets
+$(TOY_OUTDIR):
+	mkdir $(TOY_OUTDIR)
+
+$(TOY_OBJDIR):
+	mkdir $(TOY_OBJDIR)
+
+#util commands
+.PHONY: clean
+clean:
+ifeq ($(shell uname),Linux)
+	find . -type f -name '*.o' -delete
+	find . -type f -name '*.a' -delete
+	find . -type f -name '*.out' -delete
+	find . -type f -name '*.exe' -delete
+	find . -type f -name '*.dll' -delete
+	find . -type f -name '*.lib' -delete
+	find . -type f -name '*.so' -delete
+	find . -type f -name '*.dylib' -delete
+	find . -type d -name 'out' -delete
+	find . -type d -name 'obj' -delete
+else ifeq ($(shell uname),NetBSD)
+	find . -type f -name '*.o' -delete
+	find . -type f -name '*.a' -delete
+	find . -type f -name '*.out' -delete
+	find . -type f -name '*.exe' -delete
+	find . -type f -name '*.dll' -delete
+	find . -type f -name '*.lib' -delete
+	find . -type f -name '*.so' -delete
+	find . -type f -name '*.dylib' -delete
+	find . -type d -name 'out' -delete
+	find . -type d -name 'obj' -delete
+else ifeq ($(OS),Windows_NT)
+	$(RM) *.o *.a *.exe *.dll *.lib *.so *.dylib
+	$(RM) out
+	$(RM) obj
+else ifeq ($(shell uname),Darwin)
+	find . -type f -name '*.o' -delete
+	find . -type f -name '*.a' -delete
+	find . -type f -name '*.out' -delete
+	find . -type f -name '*.exe' -delete
+	find . -type f -name '*.dll' -delete
+	find . -type f -name '*.lib' -delete
+	find . -type f -name '*.so' -delete
+	find . -type f -name '*.dylib' -delete
+	find . -type d -name 'out' -delete
+	find . -type d -name 'obj' -delete
+else
+	@echo "Deletion failed - what platform is this?"
+endif
+