refactor(build): reorganize makefiles and split test targets

logger/Makefile

@@ -1,41 +1,24 @@
-ROOT_DIR := $(abspath ..)
+CXXFLAGS += \
+	-I$(ROOT_DIR)/core/include \
+	-Iinclude
 
-CC := gcc
-
-CXXFLAGS := -std=c++17 \
-            -Wall \
-            -Wextra \
-            -Werror \
-            -fPIC \
-            -I$(ROOT_DIR)/core/include \
-            -Iinclude
-
-LDFLAGS := -lstdc++
-
-BUILD_DIR := $(ROOT_DIR)/build
+LDFLAGS := \
+	-shared \
+	-Wl,--no-undefined
 
 TARGET := $(BUILD_DIR)/liblogger.so
 
-SRC := src/logger.cpp \
-       src/time_utils.cpp
-
+SRC := \
+	src/logger.cpp \
+	src/time_utils.cpp
 
 .PHONY: all clean
 
-
 all: $(TARGET)
 
-
 $(TARGET): $(SRC)
 	@mkdir -p $(BUILD_DIR)
-
-	$(CC) \
-		$(CXXFLAGS) \
-		-shared \
-		$^ \
-		-o $@ \
-		$(LDFLAGS)
-
+	$(CC) $(CXXFLAGS) $(LDFLAGS) $^ -o $@ $(LDLIBS)
 
 clean:
 	rm -f $(TARGET)