This is my current Makefile that only searches the top level directory in the src folder.
I want it to automatically search all subdirs in the src folder and link to one single exe.

Code:
APP_NAME = CoDstructor

SRC_DIR = src/cod
OBJ_DIR = obj
BIN_DIR = bin

INC_DIR = -Isrc

CXXFLAGS += -g
CXXFLAGS += -Wall
CXXFLAGS += -Werror
CXXFLAGS += -Wextra
CXXFLAGS += -pedantic
CXXFLAGS += -std=c++11

CXXFLAGS += $(INC_DIR)

LDFLAGS += -g
LDFLAGS += -static
LDFLAGS += -static-libstdc++
LDFLAGS += -static-libgcc

SOURCES = $(wildcard $(SRC_DIR)/*.cpp)
OBJS = $(addprefix $(OBJ_DIR)/,$(notdir $(SOURCES:.cpp=.o)))

$(OBJ_DIR)/%.o: $(SRC_DIR)/%.cpp
	$(CXX) $(CXXFLAGS) -c $< -o $@

$(BIN_DIR)/$(APP_NAME): $(OBJS)
	$(CXX) $(LDFLAGS) $(OBJS) -o $@