"Makefile circular dependency dropped" error - makefile

Question

I'm getting a makefile error when trying to run make client or make server. I've poked around looking for why this is, but I can't figure it out. Here's my makefile:
CC=g++
CFLAGS=-c -std=c++11 -Wno-write-strings
LDFLAGS=
SOURCES= UDP_Client.cpp UDP_Server.cpp
CSOURCES = cmain.cpp UDP_Client.cpp
SSOURCES = smain.cpp UDP_Server.cpp
OBJECTS=$(SOURCES:.cpp=.o)
COBJECTS=$(CSOURCES:.cpp=.o)
SOBJECTS=$(SSOURCES:.cpp=.o)
EXECUTABLE=run
CEXECUTABLE=client
SEXECUTABLE=server
all:
#echo "Please specifiy client or server"
client: $(CSOURCES) $(CEXECUTABLE)
server: $(SSOURCES) $(SEXECUTABLE)
$(EXECUTABLE): $(OBJECTS)
$(CC) $(LDFLAGS) $(OBJECTS) -o $#
$(CEXECUTABLE): $(COBJECTS)
$(CC) $(LDFLAGS) $(COBJECTS) -o $#
$(SEXECUTABLE): $(SOBJECTS)
$(CC) $(LDFLAGS) $(SOBJECTS) -o $#
.cpp.o:
$(CC) $(CFLAGS) $< -o $#
clean:
rm *.o
And the errors I'm getting seem simple, but here's their actual text:
make: Circular client <- client dependency dropped.

Answer 1

You've told make that client depends on client (after $(CEXECUTABLE) is expanded), this is clearly wrong.
Your makefile is a little confusing but what I think you're trying to do is
CXXFLAGS := -std=c++11 -Wno-write-strings
cobjs := cmain.o UDP_Client.o
sobjs := smain.o UDP_Server.o
.PHONY: clean
client: $(cobjs)
server: $(sobjs)
client server:
$(CXX) $(LDFLAGS) $^ $(LDLIBS) -o $#
clean:
$(RM) $(cobjs) $(sobjs)
You don't need most of the rules and variables you've defined, make already knows how to compile stuff. In fact if you rename cmain.cpp to client.cpp and smain.o to server.cpp (and change the name of the .o files in the makefile accordingly), you won't even need the recipe for client and server.
I'm not sure what you're trying to do with run, is it a different executable? If so how can it depend on UDP_Client.o and UDP_Server.o, as presumably neither have a main function defined?