cmake_minimum_required(VERSION 3.30)
project(tour_cpp26 LANGUAGES CXX)

# C++26, strictly: no gnu extensions, no fallbacks to older standards.
set(CMAKE_CXX_STANDARD 26)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

option(BOOK_SANITIZE "Run example tests under AddressSanitizer and UndefinedBehaviorSanitizer" ON)
option(BOOK_ENABLE_GAPS "Build examples for C++26 features without shipping Clang support" OFF)
option(BOOK_WERROR "Turn compiler warnings into errors for book_example targets" ON)

# clang-tidy is part of the compiler surface for this book. Demos opt out
# per-target (see book_demo in cmake/BookExample.cmake).
find_program(CLANG_TIDY_EXE NAMES clang-tidy)
if(CLANG_TIDY_EXE)
    set(CMAKE_CXX_CLANG_TIDY "${CLANG_TIDY_EXE}")
else()
    message(WARNING "clang-tidy not found; the compiler committee is incomplete")
endif()

list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
include(BookExample)

enable_testing()
add_subdirectory(examples)