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cmake_minimum_required(VERSION 3.24...3.28)
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project(cxx_modules_deep_chain CXX)
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include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
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if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
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include(CheckCompilerFlag)
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check_compiler_flag(CXX "-Wread-modules-implicitly" have_implicit_module_warning)
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if (have_implicit_module_warning)
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add_compile_options(-Werror=read-modules-implicitly)
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endif ()
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endif ()
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add_library(a STATIC)
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target_sources(a
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PUBLIC
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FILE_SET CXX_MODULES
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BASE_DIRS
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"${CMAKE_CURRENT_SOURCE_DIR}"
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FILES
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a.cxx)
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target_compile_features(a PUBLIC cxx_std_20)
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add_library(b STATIC)
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target_sources(b
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PUBLIC
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FILE_SET CXX_MODULES
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BASE_DIRS
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"${CMAKE_CURRENT_SOURCE_DIR}"
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FILES
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b.cxx)
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target_compile_features(b PUBLIC cxx_std_20)
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target_link_libraries(b PUBLIC a)
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add_library(c STATIC)
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target_sources(c
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PUBLIC
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FILE_SET CXX_MODULES
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BASE_DIRS
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"${CMAKE_CURRENT_SOURCE_DIR}"
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FILES
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c.cxx)
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target_compile_features(c PUBLIC cxx_std_20)
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target_link_libraries(c PUBLIC b)
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add_library(d STATIC)
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target_sources(d
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PUBLIC
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FILE_SET CXX_MODULES
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BASE_DIRS
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"${CMAKE_CURRENT_SOURCE_DIR}"
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FILES
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d.cxx)
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target_compile_features(d PUBLIC cxx_std_20)
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target_link_libraries(d PUBLIC c)
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add_library(e STATIC)
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target_sources(e
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PUBLIC
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FILE_SET CXX_MODULES
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BASE_DIRS
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"${CMAKE_CURRENT_SOURCE_DIR}"
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FILES
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e.cxx)
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target_compile_features(e PUBLIC cxx_std_20)
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target_link_libraries(e PUBLIC d)
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add_executable(exe)
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target_link_libraries(exe PRIVATE e)
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target_sources(exe
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PRIVATE
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main.cxx)
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add_test(NAME exe COMMAND exe)
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