Build fastsocket plugin from ext-net

ext-net/google-fastsocket/Makefile

@@ -0,0 +1,22 @@
+CUDA_HOME?=/usr/local/cuda
+INC:=-I$(CUDA_HOME)/include
+PLUGIN_SO:=../../build/libnccl-net.so
+
+default: $(PLUGIN_SO)
+
+$(PLUGIN_SO): nccl-fastsocket/net_fastsocket.cc nccl-fastsocket/compat.cc
+	$(CC) $(INC) -fPIC -shared -o $@ -Wl,-soname,$(PLUGIN_SO) $^
+
+nccl-fastsocket/%.cc:
+	git clone https://github.com/google/nccl-fastsocket.git
+
+install: $(BUILDDIR)/lib/$(PLUGIN_SO)
+
+$(BUILDDIR)/lib/$(PLUGIN_SO): $(PLUGIN_SO)
+	@printf "Grabbing %-35s > %s\n" $< $@
+	mkdir -p $(BUILDDIR)/lib
+	install -m 644 $< $@
+
+clean:
+	rm -f $(PLUGIN_SO)
+	rm -Rf nccl-fastsocket