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