add makefile for simulator samples

samples/sim65/Makefile

@@ -0,0 +1,61 @@
+
+# Run 'make SYS=<target>'; or, set a SYS env.
+# var. to build for another target system.
+SYS ?= sim6502
+
+# Just the usual way to find out if we're
+# using cmd.exe to execute make rules.
+ifneq ($(shell echo),)
+  CMD_EXE = 1
+endif
+
+ifdef CMD_EXE
+  NULLDEV = nul:
+  DEL = -del /f
+  RMDIR = rmdir /s /q
+else
+  NULLDEV = /dev/null
+  DEL = $(RM)
+  RMDIR = $(RM) -r
+endif
+
+ifdef CC65_HOME
+  AS = $(CC65_HOME)/bin/ca65
+  CC = $(CC65_HOME)/bin/cc65
+  CL = $(CC65_HOME)/bin/cl65
+  LD = $(CC65_HOME)/bin/ld65
+else
+  AS := $(if $(wildcard ../../bin/ca65*),../../bin/ca65,ca65)
+  CC := $(if $(wildcard ../../bin/cc65*),../../bin/cc65,cc65)
+  CL := $(if $(wildcard ../../bin/cl65*),../../bin/cl65,cl65)
+  LD := $(if $(wildcard ../../bin/ld65*),../../bin/ld65,ld65)
+endif
+
+EXELIST_sim6502 = \
+        cpumode_example.bin \
+        timer_example.bin \
+        trace_example.bin
+
+ifneq ($(EXELIST_$(SYS)),)
+samples: $(EXELIST_$(SYS))
+else
+samples: notavailable
+endif
+
+# empty target used to skip systems that will not work with any program in this dir
+notavailable:
+ifeq ($(MAKELEVEL),0)
+	@echo "info: sim65 tests not available for" $(SYS)
+else
+# suppress the "nothing to be done for 'samples' message
+	@echo > $(NULLDEV)
+endif
+
+.SUFFIXES:
+.SUFFIXES: .c .bin
+
+%.bin : %.c
+	$(CL) -t $(SYS) -Oris -m $*.map -o $@ $<
+
+clean:
+	@$(DEL) *.o *.map *.bin 2>$(NULLDEV)