Change cmake submodule macros #17
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I think we can be more aggressive in these changes. If we do things cleanly, there shouldn't be a use case for initializing all submodules in add_submodule(fmt)
if (${PROJECT_NAME}_BUILD_TESTING)
add_submodule(googletest gtest)
endif()By default, this macro will assume that the module, the directory, and the primary target all share the same name. If that's not the case, we can use additional arguments to make the appropriate distinctions. The macro itself will look something like this: macro(add_submodule module_name)
if (NOT TARGET module_name) # Don't clone or add subdirectory if the module/target already exists
update_submodule(module_name) # Maybe this could be expanded in this macro instead of being a separate macro?
add_subdirectory(module_name)
endif()
endmacro()We could also adapt this to be more general to pass in:
See this article on how to handle extra arguments. Let me know if I need to clarify anything here. |
cmake/initialize-submodules.cmake
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| set(MacroArgs ${ARGN}) | ||
| list(LENGTH MacroArgs NumArgs) | ||
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| set(have_submodule FALSE) |
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This doesn't appear to be used anywhere.
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Used to count arguments. This has been rearranged.
cmake/initialize-submodules.cmake
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| if (NOT is_submodule) | ||
| string(COMPARE EQUAL ${line} "[submodule \"${module_ref_name}\"]" is_submodule) | ||
| if (is_submodule) | ||
| message(STATUS "\"${module_name}\" is a submodule of this project.") |
cmake/initialize-submodules.cmake
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| if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git") | ||
| set(git_modules_file "${PROJECT_SOURCE_DIR}/.gitmodules") | ||
| if (EXISTS ${git_modules_file}) | ||
| file(STRINGS ${git_modules_file} file_lines) | ||
| set(have_path FALSE) |
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This was already set to FALSE before.
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but may be been changed within the loop
cmake/initialize-submodules.cmake
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| endif() | ||
| endif() | ||
| else() | ||
| message(STATUS "\"${module_name}\" is not a submodule of this project") |
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Shouldn't this be a FATAL_ERROR? Or maybe separate fatal errors for each situation:
- It isn't a submodule in .gitmodules: "Submodule '${module_name}' not found."
- It is a submodule, but you couldn't find the path: "Submodule '${module_name}' path not found."
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In this case the module has not been added as a git submodule for this project, but may be a submodule of another submodule. For example, HPWHsim uses googletest via btwxt.
cmake/initialize-submodules.cmake
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| if(is_submodule) | ||
| if(have_path) | ||
| message(STATUS "Updating submodule \"${module_name}\" at ${submodule_path}") |
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I think this is where we want a status message since cloning can take a while and it explains what's happening on stdout. Generally, this should only happen for the initial clone of the repository (and not for updates). Maybe a better message would be: "Initializing ${submodule} submodule"?
cmake/initialize-submodules.cmake
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| WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} | ||
| RESULT_VARIABLE GIT_SUBMOD_RESULT) | ||
| if(GIT_SUBMOD_RESULT EQUAL "0") | ||
| message(STATUS "Successfully updated submodule \"${module_name}\"") |
cmake/initialize-submodules.cmake
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| endif() | ||
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| if (TARGET ${module_name}) | ||
| message(STATUS "Submodule \"${module_name}\" is a target.") |
cmake/initialize-submodules.cmake
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| message(STATUS "Submodule \"${module_name}\" is a target.") | ||
| else() | ||
| if(EXISTS "${module_path}") | ||
| message(STATUS "Adding subdirectory ${module_path} to this project") |
cmake/initialize-submodules.cmake
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| message("") |
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Give this version a try in a few situations and feel free to change the messaging however you prefer.
Description
CMake macros were added/altered to enable optional submodule initialization. Previously, all submodules listed in .gitmodules were updated by default. For use of HPWHsim by cse, it became evident that submodules used by HPWHsim for development and testing may not be needed in projects where use is limited to the HPWHsim library only, and it is preferable to disable automatic updating of those submodules when building cse. Those updates can be made conditional through individual, qualified calls to
initialize_submodule(${submodule_name}), rather than a single call toinitialize_submodules(). In either form, only submodules listed in .gitmodules will be updated. However, one could useupdate_submodule(${submodule_name})to update a submodule without cross-referencing .gitmodules.