common_src_dirs = $(PROJECT_DIR)/src// common_src_files = $(addsuffix .c,$(common_src_dirs)) common_sort_files = $(sort $(wildcard $(common_src_files))) COMMON_SRCS = $(subst $(PROJECT_DIR)/src/,src/,$(common_sort_files))

app_src_dirs = $(PROJECT_DIR)/src/ app_src_files = $(addsuffix *.c,$(app_src_dirs)) app_sort_files = $(sort $(wildcard $(app_src_files))) APP_SRCS = $(subst $(PROJECT_DIR)/src/,src/,$(app_sort_files))