feat: release build possibility

CMakeLists.txt

@@ -1,6 +1,12 @@
 cmake_minimum_required(VERSION 3.16)
 project(CodingGame LANGUAGES C CXX)
 
+# ---------- Build-type defaults (only affects single-config generators like Ninja/Make) ----------
+if(NOT CMAKE_CONFIGURATION_TYPES AND NOT CMAKE_BUILD_TYPE)
+  set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build." FORCE)
+endif()
+
+# ---------- Dependencies ----------
 if (UNIX)
   include(FetchContent)
   FetchContent_Declare(
@@ -20,10 +26,6 @@ elseif (MSVC) # vcpkg
   find_package(glm CONFIG REQUIRED)
 endif()
 
-# Add -ggdb to debug builds
-# set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -ggdb")
-# set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -ggdb")
-
 add_executable(CodingGame
   src/IO/parser.cpp
   src/IO/file_manager.cpp
@@ -54,7 +56,15 @@ target_link_libraries(CodingGame PRIVATE
   glm::glm
 )
 
-# Debug flags
+# ---------- Visibility (helps optimizer & smaller binaries on Release) ----------
+# Only affects non-Windows compilers
+set_target_properties(CodingGame PROPERTIES
+  CXX_VISIBILITY_PRESET hidden
+  VISIBILITY_INLINES_HIDDEN YES
+)
+
+# ---------- Per-config flags ----------
+# Debug flags (your original intent, kept)
 if (MSVC)
   target_compile_options(CodingGame PRIVATE $<$<CONFIG:Debug>:/Zi>)
   target_link_options(CodingGame    PRIVATE $<$<CONFIG:Debug>:/DEBUG:FULL>)
@@ -62,6 +72,44 @@ else()
   target_compile_options(CodingGame PRIVATE $<$<CONFIG:Debug>:-ggdb>)
 endif()
 
+# Release flags
+if (MSVC)
+  # /O2: optimize speed, /GL: whole program opt (LTCG), /DNDEBUG: disable asserts
+  target_compile_options(CodingGame PRIVATE
+    $<$<CONFIG:Release>:/O2>
+    $<$<CONFIG:Release>:/DNDEBUG>
+    $<$<CONFIG:RelWithDebInfo>:/O2>
+  )
+  # Link-time codegen & extra linker opts for smaller/faster binaries
+  target_link_options(CodingGame PRIVATE
+    $<$<CONFIG:Release>:/LTCG /OPT:ICF /OPT:REF>
+    $<$<CONFIG:RelWithDebInfo>:/LTCG /OPT:ICF /OPT:REF>
+  )
+else()
+  # GCC/Clang
+  # -O3 for max opts, -ffast-math optional but can be risky; we keep it OFF by default.
+  option(CODINGGAME_USE_MARCH_NATIVE "Enable -march=native on Release for this machine" ON)
+  target_compile_options(CodingGame PRIVATE
+    $<$<CONFIG:Release>:-O3>
+    $<$<AND:$<CONFIG:Release>,$<BOOL:${CODINGGAME_USE_MARCH_NATIVE}>>:-march=native>
+    $<$<CONFIG:Release>:-DNDEBUG>
+    $<$<CONFIG:RelWithDebInfo>:-O3 -g>
+  )
+  # Linker: enable LTO when available; optionally strip symbols on non-Apple
+  include(CheckIPOSupported)  # IPO == LTO in CMake terms
+  check_ipo_supported(RESULT ipo_supported OUTPUT ipo_msg)
+  if(ipo_supported)
+    set_property(TARGET CodingGame PROPERTY INTERPROCEDURAL_OPTIMIZATION_RELEASE TRUE)
+    set_property(TARGET CodingGame PROPERTY INTERPROCEDURAL_OPTIMIZATION_RELWITHDEBINFO TRUE)
+  endif()
+
+  if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT APPLE)
+    # -s strips symbols at link stage (use only for pure Release)
+    target_link_options(CodingGame PRIVATE $<$<CONFIG:Release>:-s>)
+  endif()
+endif()
+
+# ---------- Windows: copy runtime DLLs ----------
 if (WIN32)
   add_custom_command(TARGET CodingGame POST_BUILD
     COMMAND ${CMAKE_COMMAND} -E copy_if_different