Reduce binary size a bit

Author: gbaraldi

Makefile

@@ -15,32 +15,32 @@ endif
 CXX ?= g++
 AR ?= ar
 
-# Base flags
-CXXFLAGS ?= -std=c++17 -Wall -Wextra -Werror -O2
+# Base flags with LTO for smaller binaries
+CXXFLAGS ?= -std=c++17 -Wall -Wextra -Werror -O2 -flto -ffunction-sections -fdata-sections
 INCLUDES = -I./include -I./extern/json/single_include
 
 # Platform-specific settings
 ifeq ($(UNAME),Darwin)
     # macOS
-    LDFLAGS ?=
+    LDFLAGS ?= -flto -Wl,-dead_strip
     SHARED_EXT = .dylib
     SHARED_FLAGS = -dynamiclib
     STATIC_EXT = .a
 else ifeq ($(UNAME),Linux)
     # Linux
-    LDFLAGS ?= -ldl
+    LDFLAGS ?= -flto -Wl,--gc-sections -ldl
     SHARED_EXT = .so
     SHARED_FLAGS = -shared -fPIC
     STATIC_EXT = .a
 else ifeq ($(UNAME),FreeBSD)
     # FreeBSD
-    LDFLAGS ?=
+    LDFLAGS ?= -flto -Wl,--gc-sections
     SHARED_EXT = .so
     SHARED_FLAGS = -shared -fPIC
     STATIC_EXT = .a
 else ifeq ($(UNAME),Windows)
     # Windows (MinGW)
-    LDFLAGS ?=
+    LDFLAGS ?= -flto -Wl,--gc-sections
     SHARED_EXT = .dll
     SHARED_FLAGS = -shared
     STATIC_EXT = .a