Compile .m and .mm files in src/ on Mac.

Makefile

@@ -43,6 +43,8 @@ ifdef ARCH_MAC
 	SED := sed -i ''
 	TARGET := libRack.dylib
 
+	SOURCES += $(wildcard src/*.m src/*/*.m)
+	SOURCES += $(wildcard src/*.mm src/*/*.mm)
 	SOURCES += dep/osdialog/osdialog_mac.m
 	LDFLAGS += -lpthread -ldl
 	LDFLAGS += -framework SystemConfiguration -framework Cocoa -framework OpenGL -framework IOKit -framework CoreVideo -framework CoreAudio -framework CoreMIDI

compile.mk

@@ -94,6 +94,10 @@ build/%.m.o: %.m
 	@mkdir -p $(@D)
 	$(CC) $(CFLAGS) -c -o $@ $<
 
+build/%.mm.o: %.mm
+	@mkdir -p $(@D)
+	$(CC) $(CXXFLAGS) -c -o $@ $<
+
 build/%.bin.o: %
 	@mkdir -p $(@D)
 ifdef ARCH_LIN