Indoctrinating @Nooble part 1

Makefile

# I normally put this in a separate file, but v0v
ifeq "$(OS)" "Windows_NT"
	devnull := nul
	DLL := .dll
	MKDIR := busybox mkdir
	PIC :=
	PREDLL =
	FIND = busybox find
else
	devnull := /dev/null
	ifeq "$(OS)" "Darwin"
		DLL := .dylib
	else
		DLL := .so
	endif
	MKDIR := mkdir
	PIC := -fPIC
	PREDLL = lib
	FIND = find
endif

OBJ := .o
ARCH := .a
CXXAR := -Os -pedantic -pipe -fomit-frame-pointer -isystemlibyaml/include $(PIC) -std=c++14 -Isrc -fpermissive -Wno-pedantic

OUTDIR := out/
OBJDIR := $(OUTDIR)obj/
SRCDIR := src/


SOURCES = $(sort $(shell $(FIND) $(SRCDIR)$(1) -name *.cpp))
OBJECTS = $(sort $(shell $(FIND) $(OUTDIR) -name *$(OBJ)))


all : $(subst $(SRCDIR),$(OBJDIR),$(subst .cpp,$(OBJ),$(foreach mod,$(subst :, ,$(Bullet3BuildMakeModules)),$(call SOURCES,Bullet3$(mod)))))
	@$(MKDIR) -p $(dir $@) || :
	$(CXX) $(CXXAR) -shared -o$(OUTDIR)$(PREDLL)Bullet3$(DLL) $(subst $(SRCDIR),$(OBJDIR),$^) -L. -lopencl -Wl,--enable-stdcall-fixup


$(OBJDIR)%$(OBJ) : $(SRCDIR)%.cpp
	@$(MKDIR) -p $(dir $@) || :
	$(CXX) $(CXXAR) -c -o$@ $^

Note, that this assumes, that opencl can be found via -L.

Needs a (possibly shell) variable Bullet3BuildMakeModules to be set to ':' separated module names