build system: only try building command line scripts if ./configure ran

Makefile

@@ -1,38 +1,67 @@
 .PHONY: all makefiles clean cleanall doxy
 
-all: checkmakefiles run debug memcheck
+# if out/config.py exists, we can also create command line scripts for running simulations
+ADDL_TARGETS =
+ifeq ($(wildcard out/config.py),)
+else
+    ADDL_TARGETS += run debug memcheck
+endif
+
+# default target
+all: src/Makefile $(ADDL_TARGETS)
 	@cd src && $(MAKE)
 
+# command line scripts
+run debug memcheck: % : src/scripts/%.in.py out/config.py
+	@echo "Creating script \"./$@\""
+	@head -n1 "$<" > "$@"
+	@cat out/config.py >> "$@"
+	@tail -n+2 "$<" >> "$@"
+	@chmod a+x "$@"
+
+# legacy
 makefiles:
+	@echo
+	@echo '====================================================================='
+	@echo 'Warning: make makefiles has been deprecated in favor of ./configure'
+	@echo '====================================================================='
+	@echo
 	./configure
+	@echo
+	@echo '====================================================================='
+	@echo 'Warning: make makefiles has been deprecated in favor of ./configure'
+	@echo '====================================================================='
+	@echo
 
-clean: checkmakefiles
+clean: src/Makefile
 	cd src && $(MAKE) clean
 	rm -f run debug memcheck
 
-cleanall: checkmakefiles
+cleanall: src/Makefile
 	cd src && $(MAKE) MODE=release clean
 	cd src && $(MAKE) MODE=debug clean
 	rm -f src/Makefile
 	rm -f run debug memcheck
 
-checkmakefiles:
-	@if [ ! -f src/Makefile ]; then \
-	echo; \
-	echo '====================================================================='; \
-	echo 'src/Makefile does not exist. Please use "./configure" to generate it!'; \
-	echo '====================================================================='; \
-	echo; \
-	exit 1; \
-	fi
+src/Makefile:
+	@echo
+	@echo '====================================================================='
+	@echo '$@ does not exist.'
+	@echo 'Please run "./configure" or use the OMNeT++ IDE to generate it.'
+	@echo '====================================================================='
+	@echo
+	@exit 1
 
-run debug memcheck: % : src/scripts/%.in.py out/config.py
-	@echo "Creating script \"./$@\""
-	@head -n1 "$<" > "$@"
-	@cat out/config.py >> "$@"
-	@tail -n+2 "$<" >> "$@"
-	@chmod a+x "$@"
+out/config.py:
+	@echo
+	@echo '====================================================================='
+	@echo '$@ does not exist.'
+	@echo 'Please run "./configure" to generate it.'
+	@echo '====================================================================='
+	@echo
+	@exit 1
 
+# autogenerated documentation
 doxy:
 	doxygen doxy.cfg