MAINT: Makefile improvements

Makefile

@@ -1,10 +1,28 @@
 SHELL = /bin/bash -o pipefail
 
+# some platform compatibility hacks
+rwildcard=$(wildcard $1$2) $(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2))
+execsuffix := $(if $(findstring Windows_NT,$(OS)),.exe, )
+pathchar := $(if $(findstring Windows_NT,$(OS)),\,/)
+
+sourcefiles := $(call rwildcard,src,*.rs)
+
 all: test build
 
-build:
+debugtarget := target$(pathchar)debug$(pathchar)ucg$(execsuffix)
+releasetarget := target$(pathchar)release$(pathchar)ucg$(execsuffix)
+
+$(debugtarget): $(sourcefiles)
 	cargo build
 
+$(releasetarget): $(sourcefiles)
+	cargo build --release
+
+build: $(debugtarget)
+	cargo build
+
+buildrelease: $(releasetarget)
+
 test: unit integration stdlibtest 
 
 unit:
@@ -23,5 +41,9 @@ publish: build test
 	cargo publish
 	(cd docsite; make deploysite)
 
+bench: buildrelease
+	hyperfine --warmup=5 --runs=50 "target$(pathchar)release$(pathchar)ucg$(execsuffix) test -r integration_tests"
+
 clean:
 	rm -f integration.log stdlibtest.log unittest.log
+	cargo clean