cmake_minimum_required(VERSION 3.20)

project(compiler LANGUAGES C CXX)

# 统一 C++ 标准（按实验环境可调整）
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# 可执行文件输出目录：统一放到 <build>/bin 下（避免落在 build/src/ 等子目录）
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
foreach(cfg IN ITEMS Debug Release RelWithDebInfo MinSizeRel)
  string(TOUPPER "${cfg}" cfg_upper)
  set("CMAKE_RUNTIME_OUTPUT_DIRECTORY_${cfg_upper}" "${CMAKE_BINARY_DIR}/bin")
endforeach()

# ANTLR 生成代码目录约定（不进仓库，生成在构建目录）
set(ANTLR4_GENERATED_DIR "${CMAKE_BINARY_DIR}/generated/antlr4")

# 统一的编译/包含目录选项（子模块复用）
add_library(build_options INTERFACE)
target_compile_features(build_options INTERFACE cxx_std_17)
target_include_directories(build_options INTERFACE
  "${PROJECT_SOURCE_DIR}/include"
  "${PROJECT_SOURCE_DIR}/src"
  "${ANTLR4_GENERATED_DIR}"
)

option(COMPILER_ENABLE_WARNINGS "Enable common compiler warnings" ON)
if(COMPILER_ENABLE_WARNINGS)
  if(MSVC)
    target_compile_options(build_options INTERFACE /W4)
  else()
    target_compile_options(build_options INTERFACE -Wall -Wextra -Wpedantic)
  endif()
endif()

# 尝试查找系统 ANTLR4 runtime；找不到则提供占位 target，便于先配置工程
find_package(antlr4-runtime CONFIG QUIET)

set(ANTLR4_RUNTIME_TARGET "")
if(TARGET antlr4_shared)
  set(ANTLR4_RUNTIME_TARGET antlr4_shared)
elseif(TARGET antlr4_static)
  set(ANTLR4_RUNTIME_TARGET antlr4_static)
elseif(TARGET antlr4-runtime)
  set(ANTLR4_RUNTIME_TARGET antlr4-runtime)
endif()

if(ANTLR4_RUNTIME_TARGET STREQUAL "")
  add_library(antlr4_runtime_fallback INTERFACE)
  set(ANTLR4_RUNTIME_TARGET antlr4_runtime_fallback)
  message(STATUS "antlr4-runtime 未找到：将以占位 target 配置工程；需要 ANTLR 功能时请安装/引入 antlr4-runtime。")
endif()

add_subdirectory(src)