### Author:  [@ClausKlein](https://discourse.cmake.org/u/ClausKlein)
#### Post date: [December 19, 2023, 11:15pm UTC](https://discourse.cmake.org/t/how-to-install-cxx-modules-bmi-right-without-strange-errors/9675/2 "2023-12-19T23:15:25Z")
### this works, but it seems complicated to me:
```cmake
#
# module with partitions
#
add_library(mod3 SHARED)
# cmake-format: off
target_sources(
mod3
PRIVATE mod3/mod3price.cpp mod3/mod3io.cpp
PUBLIC FILE_SET cxx_modules3
TYPE CXX_MODULES
# BASE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/mod3
FILES
mod3/mod3.cppm
mod3/mod3customer.cppm # interface partition
mod3/mod3order.cppm # internal partition
)
# cmake-format: on
target_compile_features(mod3 PUBLIC cxx_std_20)
target_link_libraries(mod3 PUBLIC fmt::fmt)
if(CMAKE_SKIP_INSTALL_RULES AND CMAKE_BUILD_TYPE STREQUAL "Debug")
target_link_libraries(mod3 PUBLIC $)
endif()
add_executable(testmod3 mod3/testmod3.cpp)
target_link_libraries(testmod3 mod3)
add_test(NAME testmod3 COMMAND testmod3)
if(CMAKE_SKIP_INSTALL_RULES)
return()
endif()
install(TARGETS modsimple)
# cmake-format: off
install(
TARGETS mod3 # TODO(CK): mod2 mod1
EXPORT CXXModules
FILE_SET cxx_modules3
COMPONENT Development
DESTINATION lib/cxx/miu
CXX_MODULES_BMI
COMPONENT Development
DESTINATION lib/cxx/bmi
)
# cmake-format: on
install(
EXPORT CXXModules
NAMESPACE mymodules::
DESTINATION lib/cmake/mod3
FILE mod3-targets.cmake
CXX_MODULES_DIRECTORY mod3-cxx-modules
)
file(
WRITE "${CMAKE_CURRENT_BINARY_DIR}/mod3-config.cmake"
"include(\"\${CMAKE_CURRENT_LIST_DIR}/mod3-targets.cmake\")
set(\${CMAKE_FIND_PACKAGE_NAME}_FOUND 1)
"
)
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/mod3-config.cmake" DESTINATION "lib/cmake/mod3")
```
```bash
cmake --build --preset Release --target install
[0/1] Install the project...
-- Install configuration: "Release"
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/libfmt.10.1.0.dylib
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/libfmt.10.dylib
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/libfmt.dylib
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/args.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/chrono.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/color.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/compile.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/core.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/format.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/format-inl.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/os.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/ostream.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/printf.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/ranges.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/std.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/include/fmt/xchar.h
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cmake/fmt/fmt-config.cmake
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cmake/fmt/fmt-config-version.cmake
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cmake/fmt/fmt-targets.cmake
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cmake/fmt/fmt-targets-release.cmake
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/pkgconfig/fmt.pc
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/bin/modsimple
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/libmod3.dylib
error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/install_name_tool: no LC_RPATH load command with path: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/build/Release/_deps/fmt-build found in: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/libmod3.dylib (for architecture x86_64), required for specified option "-delete_rpath /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/build/Release/_deps/fmt-build"
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cxx/miu/mod3/mod3.cppm
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cxx/miu/mod3/mod3customer.cppm
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cxx/miu/mod3/mod3order.cppm
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cxx/bmi/Mod3.pcm
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cxx/bmi/Mod3-Customer.pcm
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cxx/bmi/Mod3-Order.pcm
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cmake/mod3/mod3-targets.cmake
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cmake/mod3/mod3-targets-release.cmake
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cmake/mod3/mod3-cxx-modules/cxx-modules.cmake
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cmake/mod3/mod3-cxx-modules/cxx-modules-Release.cmake
-- Up-to-date: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cmake/mod3/mod3-cxx-modules/target-mod3-Release.cmake
-- Installing: /Users/clausklein/Workspace/cpp/cxx20/cppstd20-code/stagedir/lib/cmake/mod3/mod3-config.cmake
bash-5.2$
```
---
### Author:  [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [December 21, 2023, 1:52am UTC](https://discourse.cmake.org/t/how-to-install-cxx-modules-bmi-right-without-strange-errors/9675/3 "2023-12-21T01:52:56Z")
When targets with non-`PRIVATE` `FILE_SET`s are exported, the generated export files refer to these files. That is why they must be installed when the target itself is installed.
Note that BMI installation is possible, but nothing will do anything with them at the moment (reusing them is…a future endeavor that will likely need compiler assistance). I would avoid BMI installation for now.
---
### Author:  [@MathiasMagnus](https://discourse.cmake.org/u/MathiasMagnus)
#### Post date: [October 25, 2024, 7:43am UTC](https://discourse.cmake.org/t/how-to-install-cxx-modules-bmi-right-without-strange-errors/9675/4 "2024-10-25T07:43:52Z")
Thanks Ben for the heads up. Is it still the same situation now (a year-ish later)? Should BMI installation (or to be precise, reusing/depending on it) still be avoided?
---
### Author:  [@ClausKlein](https://discourse.cmake.org/u/ClausKlein)
#### Post date: [October 25, 2024, 8:04am UTC](https://discourse.cmake.org/t/how-to-install-cxx-modules-bmi-right-without-strange-errors/9675/5 "2024-10-25T08:04:49Z")
See [Error install cxx-module on VS 2022 - #2 by ClausKlein](https://discourse.cmake.org/t/error-install-cxx-module-on-vs-2022/12774/2)