update Makefile

Makefile

+# Determine Coq version
+COQ_VERSION=$(shell coqc --version | egrep -o 'version 8.[0-9]' | egrep -o '8.[0-9]')
+COQ_MAKEFILE_FLAGS ?=
+
+ifeq ($(COQ_VERSION), 8.6)
+	COQ_MAKEFILE_FLAGS += -arg -w -arg -notation-overridden,-redundant-canonical-projection
+endif
+
+# Forward most targets to Coq makefile (with some trick to make this phony)
 %: Makefile.coq phony
 	+@make -f Makefile.coq $@
 
-# Compile this project
 all: Makefile.coq
 	+@make -f Makefile.coq all
 
 clean: Makefile.coq
 	+@make -f Makefile.coq clean
+	find \( -name "*.v.d" -o -name "*.vo" -o -name "*.aux" -o -name "*.cache" -o -name "*.glob" -o -name "*.vio" \) -print -delete
 	rm -f Makefile.coq
 
+# Create Coq Makefile
 Makefile.coq: _CoqProject Makefile
-	coq_makefile -f _CoqProject | sed 's/$$(COQCHK) $$(COQCHKFLAGS) $$(COQLIBS)/$$(COQCHK) $$(COQCHKFLAGS) $$(subst -Q,-R,$$(COQLIBS))/' > Makefile.coq
+	coq_makefile $(COQ_MAKEFILE_FLAGS) -f _CoqProject -o Makefile.coq.tmp
+	sed 's/$$(COQCHK) $$(COQCHKFLAGS) $$(COQLIBS)/$$(COQCHK) $$(COQCHKFLAGS) $$(subst -Q,-R,$$(COQLIBS))/' < Makefile.coq.tmp \
+	  | awk '/^install:$$/{print;print "\tif [ -d \"$$(DSTROOT)\"$$(COQLIBINSTALL)/iris/ ]; then find \"$$(DSTROOT)\"$$(COQLIBINSTALL)/iris/ -name \"*.vo\" -print -delete; fi";next}1' > Makefile.coq
+	rm Makefile.coq.tmp
 
+# Install build-dependencies
 build-dep:
 	cat opam.pins | build/opam-pins.sh
 	opam pin add coq-lambda-rust "$$(pwd)#HEAD" -k git -y -n
 	opam install coq-lambda-rust --deps-only -y
 
-_CoqProject: ;
-
-Makefile: ;
-
+# Phony targets (i.e. targets that should be run no matter the timestamps of the involved files)
 phony: ;
-
-.PHONY: all clean phony iris-local iris-system
+.PHONY: all clean phony