perform style checks in parallel with main build

Makefile.coq.local

@@ -5,19 +5,22 @@ NO_TEST:=
 MAKE_REF:=
 
 # Run tests interleaved with main build.  They have to be in the same target for this.
-real-all: $(if $(NO_TEST),,test)
+real-all: style $(if $(NO_TEST),,test)
 
-# the test suite
-TESTFILES:=$(shell find tests -name "*.v")
-NORMALIZER:=test-normalizer.sed
-
-test: $(TESTFILES:.v=.vo)
+style: $(VFILES)
 # Make sure everything imports the options, and all Instance/Argument/Hint are qualified.
 	$(SHOW)"Performing some style checks..."
 	$(HIDE)for FILE in $(VFILES); do \
 	  if ! fgrep -q 'From stdpp Require Import options.' "$$FILE"; then echo "ERROR: $$FILE does not import 'options'."; echo; exit 1; fi ; \
 	  if egrep -n '^\s*((Existing\s+|Program\s+)Instance|Arguments|Remove|Hint\s+(Extern|Constructors|Resolve|Immediate|Mode|Opaque|Transparent|Unfold)|(Open|Close)\s+Scope|Opaque|Transparent)\b' "$$FILE"; then echo "ERROR: $$FILE contains 'Instance'/'Arguments'/'Hint' or another side-effect without locality (see above)."; echo "Please add 'Global' or 'Local' as appropriate."; echo; exit 1; fi \
 	done
+.PHONY: style
+
+# the test suite
+TESTFILES:=$(shell find tests -name "*.v")
+NORMALIZER:=test-normalizer.sed
+
+test: $(TESTFILES:.v=.vo)
 .PHONY: test
 
 COQ_TEST=$(COQTOP) $(COQDEBUG) -batch -test-mode