test/sharness: add GOFLAGS variable and race target

The GOFLAGS variable makes it possible to run all sharness
tests with go binaries built with some special flags.

The "race" target makes it easy run the sharness tests
with go binaries built with the -race flag.

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

test/sharness/Makefile

@@ -11,6 +11,9 @@ BINS = bin/random bin/multihash bin/ipfs bin/pollEndpoint
 SHARNESS = lib/sharness/sharness.sh
 IPFS_ROOT = ../..
 
+# User might want to override those on the command line
+GOFLAGS =
+
 all: clean deps $(T) aggregate
 
 clean:
@@ -32,11 +35,13 @@ $(SHARNESS):
 	@echo "*** installing $@ ***"
 	lib/install-sharness.sh
 
-bin/%: $(IPFS_ROOT)/**/*.go
-	@echo "*** installing $@ ***"
-	cd .. && make $@
+bin/%: FORCE
+	cd .. && make GOFLAGS=$(GOFLAGS) $@
+
+race:
+	make GOFLAGS=-race all
 
-.PHONY: all clean $(T) aggregate
+.PHONY: all clean $(T) aggregate FORCE
 
 # will fail if curl is not installed.
 # TODO: get rid of this and install curl with git or ipfs.